diff --git a/.gitignore b/.gitignore
index 2200de2..300911c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,8 +31,9 @@ yarn-error.log*
 next-env.d.ts
 
 # Everclone data & uploads
-data/
-attachments/
-uploads/
+/data/
+/attachments/
+/uploads/
 *.enex
 *.zip
+*.traineddata
diff --git a/package-lock.json b/package-lock.json
index 9d7a2c4..ef0a8f3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -40,15 +40,18 @@
         "mailparser": "^3.7.2",
         "marked": "^15.0.7",
         "next": "^15.2.0",
+        "pdf-parse": "^2.4.5",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "sax": "^1.4.1",
+        "tesseract.js": "^7.0.0",
         "turndown": "^7.2.0"
       },
       "devDependencies": {
         "@types/jsdom": "^21.1.7",
         "@types/mailparser": "^3.4.6",
         "@types/node": "^22.13.5",
+        "@types/pdf-parse": "^1.1.5",
         "@types/react": "^19.0.10",
         "@types/react-dom": "^19.0.4",
         "@types/sax": "^1.2.7",
@@ -809,6 +812,205 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/@napi-rs/canvas": {
+      "version": "0.1.80",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas/-/canvas-0.1.80.tgz",
+      "integrity": "sha512-DxuT1ClnIPts1kQx8FBmkk4BQDTfI5kIzywAaMjQSXfNnra5UFU9PwurXrl+Je3bJ6BGsp/zmshVVFbCmyI+ww==",
+      "license": "MIT",
+      "workspaces": [
+        "e2e/*"
+      ],
+      "engines": {
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+        "@napi-rs/canvas-linux-arm-gnueabihf": "0.1.80",
+        "@napi-rs/canvas-linux-arm64-gnu": "0.1.80",
+        "@napi-rs/canvas-linux-arm64-musl": "0.1.80",
+        "@napi-rs/canvas-linux-riscv64-gnu": "0.1.80",
+        "@napi-rs/canvas-linux-x64-gnu": "0.1.80",
+        "@napi-rs/canvas-linux-x64-musl": "0.1.80",
+        "@napi-rs/canvas-win32-x64-msvc": "0.1.80"
+      }
+    },
+    "node_modules/@napi-rs/canvas-android-arm64": {
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-android-arm64/-/canvas-android-arm64-0.1.80.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@napi-rs/canvas-darwin-arm64": {
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-darwin-arm64/-/canvas-darwin-arm64-0.1.80.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      ],
+      "engines": {
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+    },
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-darwin-x64/-/canvas-darwin-x64-0.1.80.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-arm-gnueabihf": {
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm-gnueabihf/-/canvas-linux-arm-gnueabihf-0.1.80.tgz",
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+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm64-gnu/-/canvas-linux-arm64-gnu-0.1.80.tgz",
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+        "arm64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
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+      "os": [
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm64-musl/-/canvas-linux-arm64-musl-0.1.80.tgz",
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+        "arm64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-riscv64-gnu/-/canvas-linux-riscv64-gnu-0.1.80.tgz",
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+      "cpu": [
+        "riscv64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-x64-gnu": {
+      "version": "0.1.80",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-x64-gnu/-/canvas-linux-x64-gnu-0.1.80.tgz",
+      "integrity": "sha512-BeXAmhKg1kX3UCrJsYbdQd3hIMDH/K6HnP/pG2LuITaXhXBiNdh//TVVVVCBbJzVQaV5gK/4ZOCMrQW9mvuTqA==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-x64-musl": {
+      "version": "0.1.80",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-x64-musl/-/canvas-linux-x64-musl-0.1.80.tgz",
+      "integrity": "sha512-x0XvZWdHbkgdgucJsRxprX/4o4sEed7qo9rCQA9ugiS9qE2QvP0RIiEugtZhfLH3cyI+jIRFJHV4Fuz+1BHHMg==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@napi-rs/canvas-win32-x64-msvc": {
+      "version": "0.1.80",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-win32-x64-msvc/-/canvas-win32-x64-msvc-0.1.80.tgz",
+      "integrity": "sha512-Z8jPsM6df5V8B1HrCHB05+bDiCxjE9QA//3YrkKIdVDEwn5RKaqOxCJDRJkl48cJbylcrJbW4HxZbTte8juuPg==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/@next/env": {
       "version": "15.5.28",
       "resolved": "https://registry.npmjs.org/@next/env/-/env-15.5.28.tgz",
@@ -1035,7 +1237,7 @@
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       "resolved": "https://registry.npmjs.org/@prisma/config/-/config-6.19.3.tgz",
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-      "dev": true,
+      "devOptional": true,
       "license": "Apache-2.0",
       "dependencies": {
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@@ -1048,14 +1250,14 @@
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-      "dev": true,
+      "devOptional": true,
       "license": "Apache-2.0"
     },
     "node_modules/@prisma/engines": {
       "version": "6.19.3",
       "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-6.19.3.tgz",
       "integrity": "sha512-RSYxtlYFl5pJ8ZePgMv0lZ9IzVCOdTPOegrs2qcbAEFrBI1G33h6wyC9kjQvo0DnYEhEVY0X4LsuFHXLKQk88g==",
-      "dev": true,
+      "devOptional": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
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@@ -1069,14 +1271,14 @@
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       "resolved": "https://registry.npmjs.org/@prisma/engines-version/-/engines-version-7.1.1-3.c2990dca591cba766e3b7ef5d9e8a84796e47ab7.tgz",
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-      "dev": true,
+      "devOptional": true,
       "license": "Apache-2.0"
     },
     "node_modules/@prisma/fetch-engine": {
       "version": "6.19.3",
       "resolved": "https://registry.npmjs.org/@prisma/fetch-engine/-/fetch-engine-6.19.3.tgz",
       "integrity": "sha512-tKtl/qco9Nt7LU5iKhpultD8O4vMCZcU2CHjNTnRrL1QvSUr5W/GcyFPjNL87GtRrwBc7ubXXD9xy4EvLvt8JA==",
-      "dev": true,
+      "devOptional": true,
       "license": "Apache-2.0",
       "dependencies": {
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@@ -1088,7 +1290,7 @@
       "version": "6.19.3",
       "resolved": "https://registry.npmjs.org/@prisma/get-platform/-/get-platform-6.19.3.tgz",
       "integrity": "sha512-xFj1VcJ1N3MKooOQAGO0W5tsd0W2QzIvW7DD7c/8H14Zmp4jseeWAITm+w2LLoLrlhoHdPPh0NMZ8mfL6puoHA==",
-      "dev": true,
+      "devOptional": true,
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@@ -1120,7 +1322,7 @@
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-      "dev": true,
+      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/@swc/helpers": {
@@ -1815,6 +2017,16 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/pdf-parse": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/@types/pdf-parse/-/pdf-parse-1.1.5.tgz",
+      "integrity": "sha512-kBfrSXsloMnUJOKi25s3+hRmkycHfLK6A09eRGqF/N8BkQoPUmaCr+q8Cli5FnfohEz/rsv82zAiPz/LXtOGhA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/react": {
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       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.3.0.tgz",
@@ -1906,6 +2118,19 @@
         "node": ">= 8"
       }
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+    "node_modules/anymatch/node_modules/picomatch": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
+      "integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/arg": {
       "version": "5.0.2",
       "resolved": "https://registry.npmjs.org/arg/-/arg-5.0.2.tgz",
@@ -1991,6 +2216,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/bmp-js": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/bmp-js/-/bmp-js-0.1.0.tgz",
+      "integrity": "sha512-vHdS19CnY3hwiNdkaqk93DvjVLfbEcI8mys4UjuWrlX1haDmroo8o4xCzh4wD6DGV6HxRCyauwhHRqMTfERtjw==",
+      "license": "MIT"
+    },
     "node_modules/braces": {
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       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
@@ -2042,7 +2273,7 @@
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-      "dev": true,
+      "devOptional": true,
       "license": "MIT",
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@@ -2101,7 +2332,7 @@
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-      "dev": true,
+      "devOptional": true,
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@@ -2117,7 +2348,7 @@
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-      "dev": true,
+      "devOptional": true,
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@@ -2152,14 +2383,14 @@
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-      "dev": true,
+      "devOptional": true,
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-      "dev": true,
+      "devOptional": true,
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@@ -2260,7 +2491,7 @@
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-      "dev": true,
+      "devOptional": true,
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@@ -2270,14 +2501,14 @@
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+      "devOptional": true,
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+      "devOptional": true,
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-      "dev": true,
+      "devOptional": true,
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@@ -2388,7 +2619,7 @@
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@@ -2406,7 +2637,7 @@
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+      "devOptional": true,
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@@ -2469,14 +2700,14 @@
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-      "dev": true,
+      "devOptional": true,
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+      "resolved": "https://registry.npmjs.org/zlibjs/-/zlibjs-0.3.1.tgz",
+      "integrity": "sha512-+J9RrgTKOmlxFSDHo0pI1xM6BLVUv+o0ZT9ANtCxGkjIVCCUdx9alUF8Gm+dGLKbkkkidWIHFDZHDMpfITt4+w==",
+      "license": "MIT",
+      "engines": {
+        "node": "*"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 5d75889..7bd9ed0 100644
--- a/package.json
+++ b/package.json
@@ -42,15 +42,18 @@
     "mailparser": "^3.7.2",
     "marked": "^15.0.7",
     "next": "^15.2.0",
+    "pdf-parse": "^2.4.5",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "sax": "^1.4.1",
+    "tesseract.js": "^7.0.0",
     "turndown": "^7.2.0"
   },
   "devDependencies": {
     "@types/jsdom": "^21.1.7",
     "@types/mailparser": "^3.4.6",
     "@types/node": "^22.13.5",
+    "@types/pdf-parse": "^1.1.5",
     "@types/react": "^19.0.10",
     "@types/react-dom": "^19.0.4",
     "@types/sax": "^1.2.7",
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 054f894..64f7a7b 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -30,36 +30,51 @@ model NotebookStack {
 }
 
 model Notebook {
-  id         String         @id @default(cuid())
-  userId     String         @default("default")
-  name       String
-  stackId    String?
-  stack      NotebookStack? @relation(fields: [stackId], references: [id], onDelete: SetNull)
-  isDefault  Boolean        @default(false)
-  isShortcut Boolean        @default(false)
-  sortOrder  Int            @default(0)
-  createdAt  DateTime       @default(now())
-  updatedAt  DateTime       @updatedAt
-  notes      Note[]
+  id            String          @id @default(cuid())
+  userId        String          @default("default")
+  name          String
+  stackId       String?
+  stack         NotebookStack?  @relation(fields: [stackId], references: [id], onDelete: SetNull)
+  isDefault     Boolean         @default(false)
+  isShortcut    Boolean         @default(false)
+  sortOrder     Int             @default(0)
+  createdAt     DateTime        @default(now())
+  updatedAt     DateTime        @updatedAt
+  notes         Note[]
   autoSortRules AutoSortRule[]
+  shares        NotebookShare[]
 
   @@unique([userId, name])
   @@index([userId])
   @@index([stackId])
 }
 
+model NotebookShare {
+  id         String   @id @default(cuid())
+  notebookId String
+  notebook   Notebook @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  userId     String   // Collaborator user ID
+  role       String   @default("write") // "read" | "write"
+  createdAt  DateTime @default(now())
+  updatedAt  DateTime @updatedAt
+
+  @@unique([notebookId, userId])
+  @@index([userId])
+  @@index([notebookId])
+}
+
 model Note {
-  id           String       @id @default(cuid())
-  userId       String       @default("default")
-  title        String       @default("Untitled Note")
-  contentHtml  String       @default("")
-  contentText  String       @default("")
-  excerpt      String       @default("")
+  id           String        @id @default(cuid())
+  userId       String        @default("default")
+  title        String        @default("Untitled Note")
+  contentHtml  String        @default("")
+  contentText  String        @default("")
+  excerpt      String        @default("")
   notebookId   String
-  notebook     Notebook     @relation(fields: [notebookId], references: [id], onDelete: Cascade)
-  isPinned     Boolean      @default(false)
-  isShortcut   Boolean      @default(false)
-  isTrashed    Boolean      @default(false)
+  notebook     Notebook      @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  isPinned     Boolean       @default(false)
+  isShortcut   Boolean       @default(false)
+  isTrashed    Boolean       @default(false)
   trashedAt    DateTime?
   thumbnailUrl String?
   sourceUrl    String?
@@ -67,11 +82,12 @@ model Note {
   latitude     Float?
   longitude    Float?
   reminderAt   DateTime?
-  reminderDone Boolean      @default(false)
-  createdAt    DateTime     @default(now())
-  updatedAt    DateTime     @default(now())
+  reminderDone Boolean       @default(false)
+  createdAt    DateTime      @default(now())
+  updatedAt    DateTime      @default(now())
   tags         NoteTag[]
   attachments  Attachment[]
+  history      NoteHistory[]
 
   @@index([userId, isTrashed, isPinned, updatedAt(sort: Desc)])
   @@index([notebookId, isTrashed, updatedAt(sort: Desc)])
@@ -81,6 +97,21 @@ model Note {
   @@index([title])
 }
 
+model NoteHistory {
+  id          String   @id @default(cuid())
+  noteId      String
+  note        Note     @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  title       String
+  contentHtml String
+  contentText String
+  excerpt     String   @default("")
+  wordCount   Int      @default(0)
+  createdBy   String?
+  createdAt   DateTime @default(now())
+
+  @@index([noteId, createdAt(sort: Desc)])
+}
+
 model Tag {
   id         String    @id @default(cuid())
   userId     String    @default("default")
diff --git a/src/app/api/attachments/[id]/ocr/route.ts b/src/app/api/attachments/[id]/ocr/route.ts
new file mode 100644
index 0000000..29ecd30
--- /dev/null
+++ b/src/app/api/attachments/[id]/ocr/route.ts
@@ -0,0 +1,47 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { prisma } from '@/lib/prisma';
+import { runOcrOnAttachment } from '@/lib/ocr';
+
+export async function GET(
+  _req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    const attachment = await prisma.attachment.findUnique({
+      where: { id },
+      select: { id: true, filename: true, mimeType: true, extractedText: true },
+    });
+
+    if (!attachment) {
+      return NextResponse.json({ error: 'Attachment not found' }, { status: 404 });
+    }
+
+    return NextResponse.json({
+      id: attachment.id,
+      filename: attachment.filename,
+      extractedText: attachment.extractedText,
+    });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to fetch OCR text' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(
+  _req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    const result = await runOcrOnAttachment(id);
+    return NextResponse.json(result);
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'OCR execution failed' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/attachments/[id]/route.ts b/src/app/api/attachments/[id]/route.ts
new file mode 100644
index 0000000..3521ae3
--- /dev/null
+++ b/src/app/api/attachments/[id]/route.ts
@@ -0,0 +1,58 @@
+import { NextRequest, NextResponse } from 'next/server';
+import fs from 'fs/promises';
+import { prisma } from '@/lib/prisma';
+import { getFullAttachmentPath } from '@/lib/storage';
+
+export async function GET(
+  req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    const attachment = await prisma.attachment.findUnique({
+      where: { id },
+    });
+
+    if (!attachment) {
+      return NextResponse.json({ error: 'Attachment not found' }, { status: 404 });
+    }
+
+    const fullPath = getFullAttachmentPath(attachment.storagePath);
+    const fileBuf = await fs.readFile(fullPath);
+
+    const download = req.nextUrl.searchParams.get('download') === '1';
+    const disposition = download ? 'attachment' : 'inline';
+    const safeFilename = encodeURIComponent(attachment.filename);
+
+    return new NextResponse(fileBuf, {
+      status: 200,
+      headers: {
+        'Content-Type': attachment.mimeType || 'application/octet-stream',
+        'Content-Length': String(fileBuf.length),
+        'Content-Disposition': `${disposition}; filename*=UTF-8''${safeFilename}`,
+        'Cache-Control': 'public, max-age=31536000, immutable',
+      },
+    });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to stream attachment' },
+      { status: 404 }
+    );
+  }
+}
+
+export async function DELETE(
+  _req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    await prisma.attachment.delete({ where: { id } });
+    return NextResponse.json({ deleted: true });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to delete attachment' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/attachments/ocr/route.ts b/src/app/api/attachments/ocr/route.ts
new file mode 100644
index 0000000..87adb9e
--- /dev/null
+++ b/src/app/api/attachments/ocr/route.ts
@@ -0,0 +1,55 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { prisma } from '@/lib/prisma';
+import { runOcrOnAttachment } from '@/lib/ocr';
+
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json().catch(() => ({}));
+    const limit = Math.min(parseInt(String(body.limit || '10'), 10) || 10, 50);
+
+    // Find image or PDF attachments that do not have extractedText yet
+    const pendingAttachments = await prisma.attachment.findMany({
+      where: {
+        extractedText: null,
+        OR: [
+          { mimeType: { startsWith: 'image/' } },
+          { mimeType: 'application/pdf' },
+          { filename: { endsWith: '.pdf', mode: 'insensitive' } },
+          { filename: { endsWith: '.jpg', mode: 'insensitive' } },
+          { filename: { endsWith: '.jpeg', mode: 'insensitive' } },
+          { filename: { endsWith: '.png', mode: 'insensitive' } },
+          { filename: { endsWith: '.webp', mode: 'insensitive' } },
+        ],
+      },
+      take: limit,
+      select: { id: true, filename: true },
+    });
+
+    const results = [];
+    for (const att of pendingAttachments) {
+      const res = await runOcrOnAttachment(att.id);
+      results.push({ id: att.id, filename: att.filename, success: res.success, hasText: Boolean(res.text) });
+    }
+
+    const remainingCount = await prisma.attachment.count({
+      where: {
+        extractedText: null,
+        OR: [
+          { mimeType: { startsWith: 'image/' } },
+          { mimeType: 'application/pdf' },
+        ],
+      },
+    });
+
+    return NextResponse.json({
+      processedCount: results.length,
+      remainingCount,
+      results,
+    });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Batch OCR failed' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/attachments/route.ts b/src/app/api/attachments/route.ts
new file mode 100644
index 0000000..244f6ce
--- /dev/null
+++ b/src/app/api/attachments/route.ts
@@ -0,0 +1,59 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { prisma } from '@/lib/prisma';
+import { saveAttachmentBuffer } from '@/lib/storage';
+import { enqueueAttachmentOcr } from '@/lib/ocr';
+
+export async function POST(req: NextRequest) {
+  try {
+    const formData = await req.formData();
+    const noteId = formData.get('noteId') as string | null;
+    if (!noteId) {
+      return NextResponse.json({ error: 'noteId is required' }, { status: 400 });
+    }
+
+    const files = formData.getAll('files') as File[];
+    const singleFile = formData.get('file') as File | null;
+    if (singleFile && files.length === 0) {
+      files.push(singleFile);
+    }
+
+    const created = [];
+    for (const file of files) {
+      const arrayBuf = await file.arrayBuffer();
+      const buffer = Buffer.from(arrayBuf);
+      const mimeType = file.type || 'application/octet-stream';
+      const filename = file.name || 'attachment';
+
+      const savedBlob = await saveAttachmentBuffer(buffer, filename, mimeType);
+      const attachment = await prisma.attachment.create({
+        data: {
+          noteId,
+          filename,
+          mimeType,
+          sizeBytes: savedBlob.sizeBytes,
+          md5Hash: savedBlob.md5Hash,
+          storagePath: savedBlob.storagePath,
+          extractedText: savedBlob.extractedText,
+        },
+      });
+      created.push(attachment);
+
+      if (!savedBlob.extractedText) {
+        enqueueAttachmentOcr(attachment.id);
+      }
+    }
+
+    await prisma.note.update({
+      where: { id: noteId },
+      data: { updatedAt: new Date() },
+    });
+
+    return NextResponse.json({ attachments: created });
+  } catch (err: unknown) {
+    console.error('Upload attachment error:', err);
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to upload attachment' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/notebooks/[id]/shares/route.ts b/src/app/api/notebooks/[id]/shares/route.ts
new file mode 100644
index 0000000..5ec04f4
--- /dev/null
+++ b/src/app/api/notebooks/[id]/shares/route.ts
@@ -0,0 +1,216 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { prisma, getCurrentUserId } from '@/lib/prisma';
+
+export async function GET(
+  _req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const userId = await getCurrentUserId();
+    const { id: notebookId } = await context.params;
+
+    // Verify notebook exists and user has access (either owner or shared)
+    const notebook = await prisma.notebook.findUnique({
+      where: { id: notebookId },
+      include: {
+        shares: true,
+      },
+    });
+
+    if (!notebook) {
+      return NextResponse.json({ error: 'Notebook not found' }, { status: 404 });
+    }
+
+    const isOwner = notebook.userId === userId;
+    const isCollaborator = notebook.shares.some((s) => s.userId === userId);
+
+    if (!isOwner && !isCollaborator) {
+      return NextResponse.json({ error: 'Access denied' }, { status: 403 });
+    }
+
+    // Load collaborator user profiles
+    const userIds = notebook.shares.map((s) => s.userId);
+    const users = await prisma.user.findMany({
+      where: { id: { in: userIds } },
+      select: { id: true, name: true, email: true, avatarColor: true },
+    });
+    const userMap = new Map(users.map((u) => [u.id, u]));
+
+    const sharesWithUsers = notebook.shares.map((s) => ({
+      ...s,
+      user: userMap.get(s.userId) || {
+        id: s.userId,
+        name: s.userId,
+        email: `${s.userId}@everclone.local`,
+        avatarColor: '#00a82d',
+      },
+    }));
+
+    return NextResponse.json({
+      isOwner,
+      notebook: {
+        id: notebook.id,
+        name: notebook.name,
+        userId: notebook.userId,
+      },
+      shares: sharesWithUsers,
+    });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to fetch notebook shares' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(
+  req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const userId = await getCurrentUserId();
+    const { id: notebookId } = await context.params;
+    const body = await req.json();
+
+    const notebook = await prisma.notebook.findUnique({
+      where: { id: notebookId },
+    });
+
+    if (!notebook) {
+      return NextResponse.json({ error: 'Notebook not found' }, { status: 404 });
+    }
+
+    // Only owner can share or modify shares
+    if (notebook.userId !== userId) {
+      return NextResponse.json(
+        { error: 'Only the notebook owner can manage shares' },
+        { status: 403 }
+      );
+    }
+
+    let targetUserId = body.userId?.trim();
+    const email = body.email?.trim()?.toLowerCase();
+    const role = body.role === 'read' ? 'read' : 'write';
+
+    if (!targetUserId && email) {
+      let targetUser = await prisma.user.findUnique({ where: { email } });
+      if (!targetUser) {
+        // Create user placeholder for email invitation
+        const username = email.split('@')[0];
+        targetUser = await prisma.user.create({
+          data: {
+            email,
+            name: username.charAt(0).toUpperCase() + username.slice(1),
+          },
+        });
+      }
+      targetUserId = targetUser.id;
+    }
+
+    if (!targetUserId) {
+      return NextResponse.json(
+        { error: 'Target user ID or email is required' },
+        { status: 400 }
+      );
+    }
+
+    if (targetUserId === userId) {
+      return NextResponse.json(
+        { error: 'Cannot share a notebook with yourself' },
+        { status: 400 }
+      );
+    }
+
+    const share = await prisma.notebookShare.upsert({
+      where: {
+        notebookId_userId: {
+          notebookId,
+          userId: targetUserId,
+        },
+      },
+      update: { role },
+      create: {
+        notebookId,
+        userId: targetUserId,
+        role,
+      },
+    });
+
+    const userProfile = await prisma.user.findUnique({
+      where: { id: targetUserId },
+      select: { id: true, name: true, email: true, avatarColor: true },
+    });
+
+    return NextResponse.json({
+      success: true,
+      share: {
+        ...share,
+        user: userProfile,
+      },
+    });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to save share' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function DELETE(
+  req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const currentUserId = await getCurrentUserId();
+    const { id: notebookId } = await context.params;
+    const targetUserId = req.nextUrl.searchParams.get('userId');
+    const shareId = req.nextUrl.searchParams.get('shareId');
+
+    const notebook = await prisma.notebook.findUnique({
+      where: { id: notebookId },
+    });
+
+    if (!notebook) {
+      return NextResponse.json({ error: 'Notebook not found' }, { status: 404 });
+    }
+
+    // Owner can delete any share; collaborator can remove themselves
+    const isOwner = notebook.userId === currentUserId;
+
+    if (!shareId && !targetUserId) {
+      return NextResponse.json(
+        { error: 'shareId or userId required' },
+        { status: 400 }
+      );
+    }
+
+    if (shareId) {
+      const share = await prisma.notebookShare.findUnique({ where: { id: shareId } });
+      if (!share) {
+        return NextResponse.json({ deleted: true });
+      }
+      if (!isOwner && share.userId !== currentUserId) {
+        return NextResponse.json({ error: 'Permission denied' }, { status: 403 });
+      }
+      await prisma.notebookShare.delete({ where: { id: shareId } });
+      return NextResponse.json({ deleted: true });
+    }
+
+    if (targetUserId) {
+      if (!isOwner && targetUserId !== currentUserId) {
+        return NextResponse.json({ error: 'Permission denied' }, { status: 403 });
+      }
+      await prisma.notebookShare.deleteMany({
+        where: { notebookId, userId: targetUserId },
+      });
+      return NextResponse.json({ deleted: true });
+    }
+
+    return NextResponse.json({ deleted: true });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to remove share' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/notes/[id]/history/route.ts b/src/app/api/notes/[id]/history/route.ts
new file mode 100644
index 0000000..e473d9a
--- /dev/null
+++ b/src/app/api/notes/[id]/history/route.ts
@@ -0,0 +1,140 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { prisma } from '@/lib/prisma';
+import { stripHtmlToText, makeExcerpt } from '@/lib/storage';
+
+export async function GET(
+  req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    const historyId = req.nextUrl.searchParams.get('historyId');
+
+    if (historyId) {
+      const snapshot = await prisma.noteHistory.findUnique({
+        where: { id: historyId },
+      });
+      if (!snapshot) {
+        return NextResponse.json({ error: 'Snapshot not found' }, { status: 404 });
+      }
+      return NextResponse.json(snapshot);
+    }
+
+    const history = await prisma.noteHistory.findMany({
+      where: { noteId: id },
+      orderBy: { createdAt: 'desc' },
+      select: {
+        id: true,
+        noteId: true,
+        title: true,
+        excerpt: true,
+        wordCount: true,
+        createdBy: true,
+        createdAt: true,
+      },
+      take: 50,
+    });
+
+    return NextResponse.json({ history });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Failed to load note history' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(
+  req: NextRequest,
+  context: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await context.params;
+    const body = await req.json();
+
+    const note = await prisma.note.findUnique({
+      where: { id },
+    });
+
+    if (!note) {
+      return NextResponse.json({ error: 'Note not found' }, { status: 404 });
+    }
+
+    // Restore action
+    if (body.action === 'restore') {
+      const historyId = body.historyId;
+      if (!historyId) {
+        return NextResponse.json({ error: 'historyId required' }, { status: 400 });
+      }
+
+      const snapshot = await prisma.noteHistory.findUnique({
+        where: { id: historyId },
+      });
+
+      if (!snapshot) {
+        return NextResponse.json({ error: 'Snapshot not found' }, { status: 404 });
+      }
+
+      // 1. Take a snapshot of current state before restoring
+      if (note.contentHtml) {
+        await prisma.noteHistory.create({
+          data: {
+            noteId: id,
+            title: note.title,
+            contentHtml: note.contentHtml,
+            contentText: note.contentText,
+            excerpt: note.excerpt,
+            wordCount: note.contentText.trim().split(/\s+/).filter(Boolean).length,
+            createdBy: 'Before Restore',
+          },
+        });
+      }
+
+      // 2. Restore the note to the snapshot
+      const restored = await prisma.note.update({
+        where: { id },
+        data: {
+          title: snapshot.title,
+          contentHtml: snapshot.contentHtml,
+          contentText: snapshot.contentText,
+          excerpt: snapshot.excerpt,
+          updatedAt: new Date(),
+        },
+        include: {
+          notebook: true,
+          tags: { include: { tag: true } },
+          attachments: { orderBy: { createdAt: 'asc' } },
+        },
+      });
+
+      return NextResponse.json({
+        restored: true,
+        note: {
+          ...restored,
+          tags: restored.tags.map((nt) => nt.tag),
+        },
+      });
+    }
+
+    // Manual snapshot action
+    const text = note.contentText || stripHtmlToText(note.contentHtml);
+    const snapshot = await prisma.noteHistory.create({
+      data: {
+        noteId: id,
+        title: note.title,
+        contentHtml: note.contentHtml,
+        contentText: text,
+        excerpt: note.excerpt || makeExcerpt(text),
+        wordCount: text.trim().split(/\s+/).filter(Boolean).length,
+        createdBy: body.createdBy || 'Manual Snapshot',
+      },
+    });
+
+    return NextResponse.json({ snapshot });
+  } catch (err: unknown) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : 'Note history operation failed' },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/app/api/notes/[id]/route.ts b/src/app/api/notes/[id]/route.ts
index 69c65e4..56eec3c 100644
--- a/src/app/api/notes/[id]/route.ts
+++ b/src/app/api/notes/[id]/route.ts
@@ -1,5 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server';
-import { prisma } from '@/lib/prisma';
+import { prisma, getCurrentUserId } from '@/lib/prisma';
 import { stripHtmlToText, makeExcerpt } from '@/lib/storage';
 import { getOrCreateTagIds } from '@/lib/importers';
 import { Prisma } from '@prisma/client';
@@ -9,11 +9,16 @@ export async function GET(
   context: { params: Promise<{ id: string }> }
 ) {
   try {
+    const userId = await getCurrentUserId();
     const { id } = await context.params;
     const note = await prisma.note.findUnique({
       where: { id },
       include: {
-        notebook: true,
+        notebook: {
+          include: {
+            shares: true,
+          },
+        },
         tags: { include: { tag: true } },
         attachments: { orderBy: { createdAt: 'asc' } },
       },
@@ -23,8 +28,24 @@ export async function GET(
       return NextResponse.json({ error: 'Note not found' }, { status: 404 });
     }
 
+    const hasAccess =
+      note.userId === userId ||
+      note.notebook.userId === userId ||
+      note.notebook.shares.some((s) => s.userId === userId);
+
+    if (!hasAccess) {
+      return NextResponse.json({ error: 'Access denied' }, { status: 403 });
+    }
+
+    const share = note.notebook.shares.find((s) => s.userId === userId);
+    const canEdit =
+      note.userId === userId ||
+      note.notebook.userId === userId ||
+      share?.role === 'write';
+
     return NextResponse.json({
       ...note,
+      canEdit,
       tags: note.tags.map((nt) => nt.tag),
     });
   } catch (err: unknown) {
@@ -40,9 +61,32 @@ export async function PATCH(
   context: { params: Promise<{ id: string }> }
 ) {
   try {
+    const userId = await getCurrentUserId();
     const { id } = await context.params;
     const body = await req.json();
 
+    const existingNote = await prisma.note.findUnique({
+      where: { id },
+      include: {
+        notebook: {
+          include: { shares: true },
+        },
+      },
+    });
+
+    if (!existingNote) {
+      return NextResponse.json({ error: 'Note not found' }, { status: 404 });
+    }
+
+    const canEdit =
+      existingNote.userId === userId ||
+      existingNote.notebook.userId === userId ||
+      existingNote.notebook.shares.some((s) => s.userId === userId && s.role === 'write');
+
+    if (!canEdit) {
+      return NextResponse.json({ error: 'Read-only access to this notebook' }, { status: 403 });
+    }
+
     const data: Prisma.NoteUncheckedUpdateInput = {};
     let shouldBumpUpdatedAt = false;
 
@@ -57,6 +101,40 @@ export async function PATCH(
       data.excerpt = makeExcerpt(text);
       shouldBumpUpdatedAt = true;
     }
+
+    // Automatic version history snapshotting (at most 1 snapshot per 5 minutes of editing)
+    if (body.contentHtml !== undefined || body.title !== undefined) {
+      try {
+        const lastSnapshot = await prisma.noteHistory.findFirst({
+          where: { noteId: id },
+          orderBy: { createdAt: 'desc' },
+          select: { createdAt: true },
+        });
+        const fiveMinutesAgo = new Date(Date.now() - 5 * 60 * 1000);
+        if (!lastSnapshot || lastSnapshot.createdAt < fiveMinutesAgo) {
+          const currentNote = await prisma.note.findUnique({
+            where: { id },
+            select: { title: true, contentHtml: true, contentText: true, excerpt: true },
+          });
+          if (currentNote && currentNote.contentHtml) {
+            const wordCount = currentNote.contentText.trim().split(/\s+/).filter(Boolean).length;
+            await prisma.noteHistory.create({
+              data: {
+                noteId: id,
+                title: currentNote.title,
+                contentHtml: currentNote.contentHtml,
+                contentText: currentNote.contentText,
+                excerpt: currentNote.excerpt,
+                wordCount,
+                createdBy: 'Auto Snapshot',
+              },
+            });
+          }
+        }
+      } catch (historyErr) {
+        console.warn('Note history snapshot creation failed:', historyErr);
+      }
+    }
     if (body.notebookId !== undefined) {
       data.notebookId = body.notebookId;
     }
@@ -138,9 +216,32 @@ export async function DELETE(
   context: { params: Promise<{ id: string }> }
 ) {
   try {
+    const userId = await getCurrentUserId();
     const { id } = await context.params;
     const permanent = req.nextUrl.searchParams.get('permanent') === 'true';
 
+    const existingNote = await prisma.note.findUnique({
+      where: { id },
+      include: {
+        notebook: {
+          include: { shares: true },
+        },
+      },
+    });
+
+    if (!existingNote) {
+      return NextResponse.json({ error: 'Note not found' }, { status: 404 });
+    }
+
+    const canDelete =
+      existingNote.userId === userId ||
+      existingNote.notebook.userId === userId ||
+      existingNote.notebook.shares.some((s) => s.userId === userId && s.role === 'write');
+
+    if (!canDelete) {
+      return NextResponse.json({ error: 'Read-only access to this notebook' }, { status: 403 });
+    }
+
     if (permanent) {
       await prisma.note.delete({ where: { id } });
       return NextResponse.json({ deleted: true, permanent: true });
diff --git a/src/app/api/notes/route.ts b/src/app/api/notes/route.ts
index d487024..8627563 100644
--- a/src/app/api/notes/route.ts
+++ b/src/app/api/notes/route.ts
@@ -129,7 +129,21 @@ export async function POST(req: NextRequest) {
     }
 
     const defaultNb = await ensureDefaultNotebook(userId);
-    const notebookId = body.notebookId || defaultNb.id;
+    let notebookId = defaultNb.id;
+    if (body.notebookId) {
+      const allowedNb = await prisma.notebook.findFirst({
+        where: {
+          id: body.notebookId,
+          OR: [
+            { userId },
+            { shares: { some: { userId, role: 'write' } } },
+          ],
+        },
+      });
+      if (allowedNb) {
+        notebookId = allowedNb.id;
+      }
+    }
     const title = body.title?.trim() || 'Untitled Note';
     const contentHtml = body.contentHtml || '<p></p>';
     const contentText = stripHtmlToText(contentHtml);
diff --git a/src/app/api/sidebar/route.ts b/src/app/api/sidebar/route.ts
index f1de9e5..0277f17 100644
--- a/src/app/api/sidebar/route.ts
+++ b/src/app/api/sidebar/route.ts
@@ -10,7 +10,8 @@ export async function GET() {
     const [
       users,
       stacks,
-      notebooks,
+      ownedNotebooks,
+      sharedNotebooks,
       tags,
       savedSearches,
       shortcutNotes,
@@ -28,8 +29,20 @@ export async function GET() {
       }),
       prisma.notebook.findMany({
         where: { userId },
+        include: {
+          shares: { select: { id: true, userId: true, role: true } },
+        },
         orderBy: [{ isDefault: 'desc' }, { sortOrder: 'asc' }, { name: 'asc' }],
       }),
+      prisma.notebook.findMany({
+        where: {
+          shares: { some: { userId } },
+        },
+        include: {
+          shares: { where: { userId } },
+        },
+        orderBy: [{ name: 'asc' }],
+      }),
       prisma.tag.findMany({
         where: { userId },
         orderBy: { name: 'asc' },
@@ -43,12 +56,20 @@ export async function GET() {
         select: { id: true, title: true, notebookId: true, updatedAt: true },
         orderBy: { updatedAt: 'desc' },
       }),
-      prisma.note.count({ where: { userId, isTrashed: false } }),
+      prisma.note.count({
+        where: {
+          isTrashed: false,
+          OR: [{ userId }, { notebook: { shares: { some: { userId } } } }],
+        },
+      }),
       prisma.note.count({ where: { userId, isTrashed: true } }),
-      // Fast single GROUP BY for notebook note counts
+      // Fast single GROUP BY for notebook note counts (owned + shared)
       prisma.note.groupBy({
         by: ['notebookId'],
-        where: { userId, isTrashed: false },
+        where: {
+          isTrashed: false,
+          OR: [{ userId }, { notebook: { shares: { some: { userId } } } }],
+        },
         _count: { _all: true },
       }),
       // Fast single raw GROUP BY query for tag note counts
@@ -71,14 +92,48 @@ export async function GET() {
       tagCountMap.set(item.tagId, Number(item.count));
     }
 
+    // Format owned notebooks
+    const formattedOwned = ownedNotebooks.map((nb) => ({
+      id: nb.id,
+      name: nb.name,
+      userId: nb.userId,
+      stackId: nb.stackId,
+      isDefault: nb.isDefault,
+      isShortcut: nb.isShortcut,
+      sortOrder: nb.sortOrder,
+      noteCount: notebookCountMap.get(nb.id) || 0,
+      isOwner: true,
+      isShared: nb.shares.length > 0,
+      sharesCount: nb.shares.length,
+      shareRole: 'owner' as const,
+    }));
+
+    // Format shared notebooks
+    const formattedShared = sharedNotebooks.map((nb) => {
+      const myShare = nb.shares[0];
+      return {
+        id: nb.id,
+        name: nb.name,
+        userId: nb.userId,
+        stackId: null, // Shared notebooks appear in their own section or unstacked
+        isDefault: false,
+        isShortcut: nb.isShortcut,
+        sortOrder: nb.sortOrder,
+        noteCount: notebookCountMap.get(nb.id) || 0,
+        isOwner: false,
+        isShared: true,
+        sharesCount: 1,
+        shareRole: (myShare?.role || 'read') as 'read' | 'write',
+      };
+    });
+
+    const combinedNotebooks = [...formattedOwned, ...formattedShared];
+
     return NextResponse.json({
       currentUser,
       users,
       stacks,
-      notebooks: notebooks.map((nb) => ({
-        ...nb,
-        noteCount: notebookCountMap.get(nb.id) || 0,
-      })),
+      notebooks: combinedNotebooks,
       tags: tags.map((t) => ({
         ...t,
         noteCount: tagCountMap.get(t.id) || 0,
@@ -86,8 +141,8 @@ export async function GET() {
       savedSearches,
       shortcuts: {
         notes: shortcutNotes,
-        notebooks: notebooks.filter((n) => n.isShortcut).map(nb => ({ ...nb, noteCount: notebookCountMap.get(nb.id) || 0 })),
-        tags: tags.filter((t) => t.isShortcut).map(t => ({ ...t, noteCount: tagCountMap.get(t.id) || 0 })),
+        notebooks: combinedNotebooks.filter((n) => n.isShortcut),
+        tags: tags.filter((t) => t.isShortcut).map((t) => ({ ...t, noteCount: tagCountMap.get(t.id) || 0 })),
         savedSearches: savedSearches.filter((s) => s.isShortcut),
       },
       counts: {
diff --git a/src/components/EvercloneWorkspace.tsx b/src/components/EvercloneWorkspace.tsx
index dd43266..7723b57 100644
--- a/src/components/EvercloneWorkspace.tsx
+++ b/src/components/EvercloneWorkspace.tsx
@@ -45,6 +45,8 @@ import {
   ArrowRight,
   Link2,
   GitMerge,
+  History,
+  Users,
 } from 'lucide-react';
 import {
   SidebarData,
@@ -57,6 +59,8 @@ import SettingsView from './SettingsView';
 import ThumbnailEditorModal from './ThumbnailEditorModal';
 import TriageModal from './TriageModal';
 import MergeNotebookModal from './MergeNotebookModal';
+import ShareNotebookModal from './ShareNotebookModal';
+import NoteHistoryModal from './NoteHistoryModal';
 import { PdfAutoThumbnail, InlinePdfViewerCard } from './PdfNoteComponents';
 
 export default function EvercloneWorkspace() {
@@ -247,6 +251,13 @@ export default function EvercloneWorkspace() {
   const [mergeModalOpen, setMergeModalOpen] = useState(false);
   const [mergeSourceNotebook, setMergeSourceNotebook] = useState<NotebookItem | null>(null);
 
+  // Share Notebooks modal
+  const [shareModalOpen, setShareModalOpen] = useState(false);
+  const [shareNotebookTarget, setShareNotebookTarget] = useState<NotebookItem | null>(null);
+
+  // Note Version History modal
+  const [historyModalOpen, setHistoryModalOpen] = useState(false);
+
   const searchInputRef = useRef<HTMLInputElement>(null);
   const saveTimerRef = useRef<NodeJS.Timeout | null>(null);
   const listParentRef = useRef<HTMLDivElement>(null);
@@ -658,6 +669,23 @@ export default function EvercloneWorkspace() {
     };
   }, [selectedNoteId]);
 
+  const reloadActiveNote = useCallback(
+    async (noteId?: string) => {
+      const targetId = noteId || selectedNoteId;
+      if (!targetId) return;
+      try {
+        const res = await fetch(`/api/notes/${targetId}`);
+        if (!res.ok) return;
+        const data: NoteDetail = await res.json();
+        setActiveNote(data);
+        setSaveState('saved');
+      } catch (e) {
+        console.error('Error reloading note detail:', e);
+      }
+    },
+    [selectedNoteId]
+  );
+
   // Auto-save note edits with debounce
   const scheduleNoteSave = useCallback(
     (noteId: string, patch: Record<string, unknown>) => {
@@ -1515,6 +1543,10 @@ export default function EvercloneWorkspace() {
                                 setMergeSourceNotebook(item);
                                 setMergeModalOpen(true);
                               }}
+                              onShare={(item) => {
+                                setShareNotebookTarget(item);
+                                setShareModalOpen(true);
+                              }}
                               onDeleted={() => {
                                 if (selectedNotebookId === nb.id) {
                                   setSelectedNotebookId('');
@@ -1548,6 +1580,10 @@ export default function EvercloneWorkspace() {
                       setMergeSourceNotebook(item);
                       setMergeModalOpen(true);
                     }}
+                    onShare={(item) => {
+                      setShareNotebookTarget(item);
+                      setShareModalOpen(true);
+                    }}
                     onDeleted={() => {
                       if (selectedNotebookId === nb.id) {
                         setSelectedNotebookId('');
@@ -3093,6 +3129,15 @@ export default function EvercloneWorkspace() {
                       <Info className="w-4 h-4" />
                     </button>
 
+                    <button
+                      type="button"
+                      onClick={() => setHistoryModalOpen(true)}
+                      title="Note Version History & Snapshots"
+                      className="p-1.5 rounded-lg hover:bg-gray-100 text-gray-500"
+                    >
+                      <History className="w-4 h-4" />
+                    </button>
+
                     {/* Export Menu */}
                     <div className="relative">
                       <button
@@ -3200,12 +3245,20 @@ export default function EvercloneWorkspace() {
               </div>
             )}
 
+            {/* Read-Only Notice for Shared Notes */}
+            {activeNote.canEdit === false && (
+              <div className="mx-6 mt-3 px-3 py-1.5 bg-amber-50 border border-amber-200 text-amber-800 rounded-md text-xs flex items-center gap-2">
+                <Users className="w-4 h-4 shrink-0 text-amber-600" />
+                <span>You have <strong>view-only</strong> access to this shared note.</span>
+              </div>
+            )}
+
             {/* Note Title Input */}
             <div className="px-6 pt-5 pb-2">
               <input
                 type="text"
                 value={activeNote.title}
-                readOnly={activeNote.isTrashed}
+                readOnly={activeNote.isTrashed || activeNote.canEdit === false}
                 onChange={(e) => {
                   const newTitle = e.target.value;
                   setActiveNote({ ...activeNote, title: newTitle });
@@ -3220,7 +3273,7 @@ export default function EvercloneWorkspace() {
             <RichNoteEditor
               noteId={activeNote.id}
               contentHtml={activeNote.contentHtml}
-              readOnly={activeNote.isTrashed}
+              readOnly={activeNote.isTrashed || activeNote.canEdit === false}
               onChange={(newHtml) => {
                 setActiveNote((prev) =>
                   prev ? { ...prev, contentHtml: newHtml } : prev
@@ -3314,6 +3367,33 @@ export default function EvercloneWorkspace() {
                           <span className="text-[10px] text-gray-400">
                             {(att.sizeBytes / 1024).toFixed(1)} KB
                           </span>
+                          {att.extractedText ? (
+                            <span
+                              className="px-1.5 py-0.5 text-[9px] font-semibold bg-emerald-50 text-emerald-700 border border-emerald-200 rounded cursor-help"
+                              title={`Extracted Text (OCR):\n${att.extractedText.slice(0, 300)}${att.extractedText.length > 300 ? '...' : ''}`}
+                            >
+                              OCR
+                            </span>
+                          ) : isImg ? (
+                            <button
+                              type="button"
+                              onClick={async () => {
+                                try {
+                                  const res = await fetch(`/api/attachments/${att.id}/ocr`, { method: 'POST' });
+                                  const data = await res.json();
+                                  if (data.extractedText) {
+                                    reloadActiveNote(activeNote.id);
+                                  }
+                                } catch (e) {
+                                  console.error(e);
+                                }
+                              }}
+                              className="px-1.5 py-0.5 text-[9px] text-gray-400 hover:text-emerald-700 hover:bg-emerald-50 border border-gray-200 rounded"
+                              title="Click to run OCR on this image now"
+                            >
+                              +OCR
+                            </button>
+                          ) : null}
                           {isImg && !activeNote.isTrashed && (
                             <button
                               type="button"
@@ -3441,6 +3521,32 @@ export default function EvercloneWorkspace() {
         stacks={sidebar.stacks}
         onMerged={handleMergedNotebook}
       />
+
+      {shareNotebookTarget && (
+        <ShareNotebookModal
+          open={shareModalOpen}
+          onClose={() => {
+            setShareModalOpen(false);
+            setShareNotebookTarget(null);
+          }}
+          notebook={shareNotebookTarget}
+          users={sidebar.users || []}
+          currentUser={sidebar.currentUser}
+          onSharesChanged={fetchSidebar}
+        />
+      )}
+
+      {activeNote && (
+        <NoteHistoryModal
+          open={historyModalOpen}
+          onClose={() => setHistoryModalOpen(false)}
+          note={activeNote}
+          onRestored={(updatedNote) => {
+            setActiveNote(updatedNote);
+            fetchNotesList();
+          }}
+        />
+      )}
       </>
       )}
       {/* Floating PWA Install Banner on Mobile */}
@@ -3635,6 +3741,7 @@ function NotebookRow({
   onDropNote,
   onRefresh,
   onMerge,
+  onShare,
   onDeleted,
   canMerge,
 }: {
@@ -3644,6 +3751,7 @@ function NotebookRow({
   onDropNote?: (noteId: string) => void;
   onRefresh: () => void;
   onMerge?: (nb: NotebookItem) => void;
+  onShare?: (nb: NotebookItem) => void;
   onDeleted?: () => void;
   canMerge?: boolean;
 }) {
@@ -3682,6 +3790,14 @@ function NotebookRow({
       >
         <Book className="w-3.5 h-3.5 text-gray-400 shrink-0" />
         <span className="truncate">{nb.name}</span>
+        {nb.isShared && (
+          <span
+            title={nb.isOwner === false ? `Shared with you (${nb.shareRole ?? 'read'})` : 'Shared notebook'}
+            className="flex items-center text-blue-400 shrink-0"
+          >
+            <Users className="w-3 h-3" />
+          </span>
+        )}
         {nb.isDefault && (
           <span className="text-[9px] uppercase px-1 py-0.2 bg-neutral-700 text-emerald-400 rounded">
             Default
@@ -3726,6 +3842,19 @@ function NotebookRow({
           >
             Rename Notebook…
           </button>
+          {onShare && (
+            <button
+              type="button"
+              onClick={() => {
+                setMenuOpen(false);
+                onShare(nb);
+              }}
+              className="w-full text-left px-3 py-1.5 hover:bg-neutral-800 flex items-center gap-2 text-blue-400 hover:text-blue-300"
+            >
+              <Users className="w-3.5 h-3.5" />
+              <span>Share Notebook…</span>
+            </button>
+          )}
           {canMerge && onMerge && (
             <button
               type="button"
diff --git a/src/components/NoteHistoryModal.tsx b/src/components/NoteHistoryModal.tsx
new file mode 100644
index 0000000..cbe9b37
--- /dev/null
+++ b/src/components/NoteHistoryModal.tsx
@@ -0,0 +1,274 @@
+'use client';
+
+import React, { useState, useEffect } from 'react';
+import { History, X, RotateCcw, Camera, Clock, FileText, Loader2, AlertCircle } from 'lucide-react';
+import { format, formatDistanceToNow } from 'date-fns';
+import { NoteDetail, NoteHistoryItem } from '@/types/everclone';
+
+interface NoteHistoryModalProps {
+  open: boolean;
+  onClose: () => void;
+  note: NoteDetail | null;
+  onRestored: (updatedNote: NoteDetail) => void;
+}
+
+export default function NoteHistoryModal({
+  open,
+  onClose,
+  note,
+  onRestored,
+}: NoteHistoryModalProps) {
+  const [historyList, setHistoryList] = useState<NoteHistoryItem[]>([]);
+  const [selectedSnapshot, setSelectedSnapshot] = useState<NoteHistoryItem | null>(null);
+  const [loadingList, setLoadingList] = useState(false);
+  const [loadingDetail, setLoadingDetail] = useState(false);
+  const [restoring, setRestoring] = useState(false);
+  const [takingSnapshot, setTakingSnapshot] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const loadHistory = async () => {
+    if (!note) return;
+    setLoadingList(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/notes/${note.id}/history`);
+      if (!res.ok) throw new Error('Failed to load history');
+      const data = await res.json();
+      const items: NoteHistoryItem[] = data.history || [];
+      setHistoryList(items);
+      if (items.length > 0) {
+        loadSnapshotDetail(items[0].id);
+      } else {
+        setSelectedSnapshot(null);
+      }
+    } catch (err) {
+      console.error(err);
+      setError('Could not load version history.');
+    } finally {
+      setLoadingList(false);
+    }
+  };
+
+  const loadSnapshotDetail = async (historyId: string) => {
+    if (!note) return;
+    setLoadingDetail(true);
+    try {
+      const res = await fetch(`/api/notes/${note.id}/history?historyId=${historyId}`);
+      if (!res.ok) throw new Error('Failed to load snapshot details');
+      const detail: NoteHistoryItem = await res.json();
+      setSelectedSnapshot(detail);
+    } catch (err) {
+      console.error(err);
+    } finally {
+      setLoadingDetail(false);
+    }
+  };
+
+  useEffect(() => {
+    if (open && note) {
+      loadHistory();
+    }
+  }, [open, note?.id]);
+
+  if (!open || !note) return null;
+
+  const handleTakeSnapshot = async () => {
+    setTakingSnapshot(true);
+    try {
+      const res = await fetch(`/api/notes/${note.id}/history`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action: 'snapshot', createdBy: 'Manual' }),
+      });
+      if (!res.ok) throw new Error('Failed to take snapshot');
+      await loadHistory();
+    } catch (err) {
+      console.error(err);
+      setError('Failed to capture snapshot.');
+    } finally {
+      setTakingSnapshot(false);
+    }
+  };
+
+  const handleRestore = async (historyId: string) => {
+    if (!window.confirm('Restore this version? A snapshot of your current note will be saved first so nothing is lost.')) {
+      return;
+    }
+    setRestoring(true);
+    try {
+      const res = await fetch(`/api/notes/${note.id}/history`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action: 'restore', historyId }),
+      });
+      const data = await res.json();
+      if (!res.ok) throw new Error(data.error || 'Failed to restore snapshot');
+
+      onRestored(data.note);
+      onClose();
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Error restoring version');
+    } finally {
+      setRestoring(false);
+    }
+  };
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/70 backdrop-blur-sm animate-in fade-in duration-150">
+      <div className="relative w-full max-w-4xl h-[85vh] max-h-[750px] bg-neutral-900 border border-neutral-700 rounded-2xl shadow-2xl flex flex-col overflow-hidden text-neutral-100">
+        {/* Header */}
+        <div className="flex items-center justify-between px-6 py-4 border-b border-neutral-800 bg-neutral-900/90 shrink-0">
+          <div className="flex items-center gap-2.5">
+            <div className="p-2 rounded-xl bg-purple-500/10 text-purple-400 border border-purple-500/20">
+              <History className="w-5 h-5" />
+            </div>
+            <div>
+              <h2 className="text-sm font-semibold text-white">Note Version History</h2>
+              <p className="text-xs text-neutral-400 truncate max-w-md">
+                Snapshots and previous edits for "{note.title}"
+              </p>
+            </div>
+          </div>
+
+          <div className="flex items-center gap-2">
+            <button
+              type="button"
+              onClick={handleTakeSnapshot}
+              disabled={takingSnapshot}
+              className="flex items-center gap-1.5 px-3 py-1.5 bg-neutral-800 hover:bg-neutral-700 text-neutral-200 rounded-xl text-xs font-medium border border-neutral-700 transition disabled:opacity-50"
+              title="Save a snapshot of the current note state"
+            >
+              {takingSnapshot ? (
+                <Loader2 className="w-3.5 h-3.5 animate-spin" />
+              ) : (
+                <Camera className="w-3.5 h-3.5" />
+              )}
+              <span>Take Snapshot Now</span>
+            </button>
+
+            <button
+              type="button"
+              onClick={onClose}
+              className="p-1.5 text-neutral-400 hover:text-white rounded-lg hover:bg-neutral-800 transition"
+            >
+              <X className="w-4 h-4" />
+            </button>
+          </div>
+        </div>
+
+        {error && (
+          <div className="mx-6 mt-4 p-3 bg-red-950/60 border border-red-800/80 rounded-xl text-xs text-red-200 flex items-center gap-2">
+            <AlertCircle className="w-4 h-4 text-red-400 shrink-0" />
+            <span>{error}</span>
+          </div>
+        )}
+
+        {/* 2-Pane Body */}
+        <div className="flex-1 flex overflow-hidden">
+          {/* Left Timeline Pane */}
+          <div className="w-72 sm:w-80 border-r border-neutral-800 flex flex-col bg-neutral-900/50">
+            <div className="p-3 border-b border-neutral-800/80 text-[11px] font-semibold text-neutral-400 uppercase tracking-wider">
+              Saved Snapshots ({historyList.length})
+            </div>
+
+            <div className="flex-1 overflow-y-auto p-2 space-y-1">
+              {loadingList ? (
+                <div className="p-6 text-center text-xs text-neutral-500">Loading version history…</div>
+              ) : historyList.length === 0 ? (
+                <div className="p-6 text-center space-y-2">
+                  <Clock className="w-8 h-8 text-neutral-600 mx-auto" />
+                  <p className="text-xs text-neutral-400 font-medium">No previous snapshots yet</p>
+                  <p className="text-[11px] text-neutral-500">
+                    Snapshots are automatically saved while editing, or tap "Take Snapshot Now" above.
+                  </p>
+                </div>
+              ) : (
+                historyList.map((item) => {
+                  const isSelected = selectedSnapshot?.id === item.id;
+                  const date = new Date(item.createdAt);
+                  return (
+                    <button
+                      key={item.id}
+                      type="button"
+                      onClick={() => loadSnapshotDetail(item.id)}
+                      className={`w-full text-left p-3 rounded-xl transition flex flex-col gap-1 border ${
+                        isSelected
+                          ? 'bg-purple-950/40 border-purple-500/50 text-white shadow'
+                          : 'bg-neutral-800/30 border-transparent text-neutral-300 hover:bg-neutral-800/80 hover:text-white'
+                      }`}
+                    >
+                      <div className="flex items-center justify-between text-xs font-semibold">
+                        <span className="truncate">{item.title || 'Untitled Note'}</span>
+                        <span className="text-[10px] text-neutral-400 font-normal shrink-0">
+                          {formatDistanceToNow(date, { addSuffix: true })}
+                        </span>
+                      </div>
+                      <div className="text-[11px] text-neutral-400 flex items-center justify-between">
+                        <span>{format(date, 'MMM d, yyyy · h:mm a')}</span>
+                        <span className="text-[10px] px-1.5 py-0.5 rounded bg-neutral-800 text-neutral-300">
+                          {item.wordCount} words
+                        </span>
+                      </div>
+                    </button>
+                  );
+                })
+              )}
+            </div>
+          </div>
+
+          {/* Right Snapshot Preview Pane */}
+          <div className="flex-1 flex flex-col bg-neutral-950 overflow-hidden">
+            {loadingDetail ? (
+              <div className="flex-1 flex items-center justify-center text-xs text-neutral-500">
+                <Loader2 className="w-5 h-5 animate-spin mr-2" />
+                Loading snapshot preview…
+              </div>
+            ) : selectedSnapshot ? (
+              <>
+                <div className="px-6 py-3.5 border-b border-neutral-800 bg-neutral-900/60 flex items-center justify-between shrink-0">
+                  <div>
+                    <h3 className="text-sm font-semibold text-white">{selectedSnapshot.title}</h3>
+                    <p className="text-[11px] text-neutral-400">
+                      Captured on {format(new Date(selectedSnapshot.createdAt), 'MMMM d, yyyy · h:mm:ss a')} · {selectedSnapshot.wordCount} words
+                    </p>
+                  </div>
+
+                  <button
+                    type="button"
+                    onClick={() => handleRestore(selectedSnapshot.id)}
+                    disabled={restoring}
+                    className="flex items-center gap-1.5 px-4 py-2 bg-emerald-600 hover:bg-emerald-500 text-white rounded-xl text-xs font-semibold shadow transition disabled:opacity-50"
+                  >
+                    {restoring ? (
+                      <Loader2 className="w-3.5 h-3.5 animate-spin" />
+                    ) : (
+                      <RotateCcw className="w-3.5 h-3.5" />
+                    )}
+                    <span>Restore This Version</span>
+                  </button>
+                </div>
+
+                <div className="flex-1 overflow-y-auto p-6 space-y-4">
+                  {selectedSnapshot.contentHtml ? (
+                    <div
+                      className="prose prose-invert prose-sm max-w-none text-neutral-200"
+                      dangerouslySetInnerHTML={{ __html: selectedSnapshot.contentHtml }}
+                    />
+                  ) : (
+                    <pre className="text-xs text-neutral-300 whitespace-pre-wrap font-sans">
+                      {selectedSnapshot.contentText || '(Empty snapshot)'}
+                    </pre>
+                  )}
+                </div>
+              </>
+            ) : (
+              <div className="flex-1 flex items-center justify-center text-xs text-neutral-500">
+                Select a version from the timeline on the left to preview it.
+              </div>
+            )}
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/ShareNotebookModal.tsx b/src/components/ShareNotebookModal.tsx
new file mode 100644
index 0000000..cc30a27
--- /dev/null
+++ b/src/components/ShareNotebookModal.tsx
@@ -0,0 +1,300 @@
+'use client';
+
+import React, { useState, useEffect } from 'react';
+import { Users, X, UserPlus, Trash2, Shield, Eye, Edit3, Loader2 } from 'lucide-react';
+import { NotebookItem, NotebookShareItem, UserItem } from '@/types/everclone';
+
+interface ShareNotebookModalProps {
+  open: boolean;
+  onClose: () => void;
+  notebook: NotebookItem | null;
+  users: UserItem[];
+  currentUser?: UserItem;
+  onSharesChanged?: () => void;
+}
+
+export default function ShareNotebookModal({
+  open,
+  onClose,
+  notebook,
+  users,
+  currentUser,
+  onSharesChanged,
+}: ShareNotebookModalProps) {
+  const [shares, setShares] = useState<NotebookShareItem[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [sharing, setSharing] = useState(false);
+  const [selectedUserId, setSelectedUserId] = useState<string>('');
+  const [customEmail, setCustomEmail] = useState<string>('');
+  const [selectedRole, setSelectedRole] = useState<'write' | 'read'>('write');
+  const [error, setError] = useState<string | null>(null);
+
+  // Other users eligible to be added
+  const eligibleUsers = users.filter(
+    (u) => u.id !== currentUser?.id && u.id !== notebook?.userId
+  );
+
+  const loadShares = async () => {
+    if (!notebook) return;
+    setLoading(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/notebooks/${notebook.id}/shares`);
+      if (!res.ok) throw new Error('Failed to load shares');
+      const data = await res.json();
+      setShares(data.shares || []);
+    } catch (e) {
+      console.error(e);
+      setError('Could not load notebook shares.');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    if (open && notebook) {
+      loadShares();
+      setCustomEmail('');
+      if (eligibleUsers.length > 0) {
+        setSelectedUserId(eligibleUsers[0].id);
+      }
+    }
+  }, [open, notebook?.id]);
+
+  if (!open || !notebook) return null;
+
+  const handleAddShare = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError(null);
+    setSharing(true);
+
+    try {
+      const payload: { userId?: string; email?: string; role: 'read' | 'write' } = {
+        role: selectedRole,
+      };
+
+      if (customEmail.trim()) {
+        payload.email = customEmail.trim();
+      } else if (selectedUserId) {
+        payload.userId = selectedUserId;
+      } else {
+        throw new Error('Please select a user or enter an email address.');
+      }
+
+      const res = await fetch(`/api/notebooks/${notebook.id}/shares`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(payload),
+      });
+
+      const data = await res.json();
+      if (!res.ok) throw new Error(data.error || 'Failed to share notebook');
+
+      setCustomEmail('');
+      await loadShares();
+      if (onSharesChanged) onSharesChanged();
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Error sharing notebook');
+    } finally {
+      setSharing(false);
+    }
+  };
+
+  const handleRemoveShare = async (shareId: string) => {
+    if (!window.confirm('Revoke access for this collaborator?')) return;
+    try {
+      const res = await fetch(`/api/notebooks/${notebook.id}/shares?shareId=${shareId}`, {
+        method: 'DELETE',
+      });
+      if (!res.ok) throw new Error('Failed to remove share');
+      await loadShares();
+      if (onSharesChanged) onSharesChanged();
+    } catch (err) {
+      console.error(err);
+      setError('Failed to remove collaborator.');
+    }
+  };
+
+  const handleUpdateRole = async (shareUserId: string, newRole: 'read' | 'write') => {
+    try {
+      const res = await fetch(`/api/notebooks/${notebook.id}/shares`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ userId: shareUserId, role: newRole }),
+      });
+      if (!res.ok) throw new Error('Failed to update role');
+      await loadShares();
+      if (onSharesChanged) onSharesChanged();
+    } catch (err) {
+      console.error(err);
+      setError('Failed to update permission.');
+    }
+  };
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/60 backdrop-blur-sm animate-in fade-in duration-150">
+      <div className="relative w-full max-w-lg bg-neutral-900 border border-neutral-700 rounded-2xl shadow-2xl overflow-hidden text-neutral-100">
+        {/* Header */}
+        <div className="flex items-center justify-between px-6 py-4 border-b border-neutral-800 bg-neutral-900/80">
+          <div className="flex items-center gap-2.5">
+            <div className="p-2 rounded-xl bg-blue-500/10 text-blue-400 border border-blue-500/20">
+              <Users className="w-5 h-5" />
+            </div>
+            <div>
+              <h2 className="text-sm font-semibold text-white">Share Notebook</h2>
+              <p className="text-xs text-neutral-400">
+                Collaborate on <span className="text-white font-medium">"{notebook.name}"</span>
+              </p>
+            </div>
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            className="p-1 text-neutral-400 hover:text-white rounded-lg hover:bg-neutral-800 transition"
+          >
+            <X className="w-4 h-4" />
+          </button>
+        </div>
+
+        <div className="p-6 space-y-5">
+          {error && (
+            <div className="p-3 bg-red-950/60 border border-red-800/80 rounded-xl text-xs text-red-200">
+              {error}
+            </div>
+          )}
+
+          {/* Add collaborator form */}
+          <form onSubmit={handleAddShare} className="space-y-3">
+            <label className="block text-xs font-medium text-neutral-300">
+              Add Collaborator
+            </label>
+
+            <div className="grid grid-cols-1 sm:grid-cols-3 gap-2">
+              <div className="sm:col-span-2 space-y-1.5">
+                {eligibleUsers.length > 0 ? (
+                  <select
+                    value={selectedUserId}
+                    onChange={(e) => {
+                      setSelectedUserId(e.target.value);
+                      setCustomEmail('');
+                    }}
+                    className="w-full px-3 py-2 bg-neutral-800 border border-neutral-700 rounded-xl text-xs text-white focus:outline-none focus:border-blue-500"
+                  >
+                    {eligibleUsers.map((u) => (
+                      <option key={u.id} value={u.id}>
+                        {u.name} ({u.email})
+                      </option>
+                    ))}
+                  </select>
+                ) : (
+                  <input
+                    type="email"
+                    value={customEmail}
+                    onChange={(e) => setCustomEmail(e.target.value)}
+                    placeholder="Collaborator email…"
+                    className="w-full px-3 py-2 bg-neutral-800 border border-neutral-700 rounded-xl text-xs text-white placeholder-neutral-500 focus:outline-none focus:border-blue-500"
+                  />
+                )}
+              </div>
+
+              <div>
+                <select
+                  value={selectedRole}
+                  onChange={(e) => setSelectedRole(e.target.value as 'write' | 'read')}
+                  className="w-full px-3 py-2 bg-neutral-800 border border-neutral-700 rounded-xl text-xs text-white focus:outline-none focus:border-blue-500"
+                >
+                  <option value="write">Can edit</option>
+                  <option value="read">Can view</option>
+                </select>
+              </div>
+            </div>
+
+            <button
+              type="submit"
+              disabled={sharing || (!selectedUserId && !customEmail.trim())}
+              className="w-full flex items-center justify-center gap-1.5 py-2 bg-blue-600 hover:bg-blue-500 text-white rounded-xl text-xs font-semibold shadow transition disabled:opacity-50"
+            >
+              {sharing ? (
+                <>
+                  <Loader2 className="w-3.5 h-3.5 animate-spin" />
+                  <span>Inviting…</span>
+                </>
+              ) : (
+                <>
+                  <UserPlus className="w-3.5 h-3.5" />
+                  <span>Share Notebook</span>
+                </>
+              )}
+            </button>
+          </form>
+
+          {/* Current Collaborators */}
+          <div className="space-y-2 pt-2 border-t border-neutral-800">
+            <h3 className="text-xs font-semibold text-neutral-300">Who has access</h3>
+
+            {loading ? (
+              <div className="py-4 text-center text-xs text-neutral-500">Loading collaborators…</div>
+            ) : shares.length === 0 ? (
+              <div className="py-4 text-center text-xs text-neutral-500 bg-neutral-800/30 rounded-xl border border-neutral-800">
+                This notebook is private to you.
+              </div>
+            ) : (
+              <div className="space-y-2 max-h-52 overflow-y-auto pr-1">
+                {shares.map((s) => (
+                  <div
+                    key={s.id}
+                    className="flex items-center justify-between p-2.5 bg-neutral-800/60 border border-neutral-700/60 rounded-xl text-xs"
+                  >
+                    <div className="flex items-center gap-2.5 truncate">
+                      <div
+                        className="w-7 h-7 rounded-full flex items-center justify-center text-white text-[11px] font-bold shrink-0"
+                        style={{ backgroundColor: s.user?.avatarColor || '#2563eb' }}
+                      >
+                        {s.user?.name ? s.user.name.charAt(0).toUpperCase() : 'U'}
+                      </div>
+                      <div className="truncate">
+                        <div className="font-medium text-white truncate">{s.user?.name || s.userId}</div>
+                        <div className="text-[10px] text-neutral-400 truncate">{s.user?.email || ''}</div>
+                      </div>
+                    </div>
+
+                    <div className="flex items-center gap-2 shrink-0">
+                      <select
+                        value={s.role}
+                        onChange={(e) => handleUpdateRole(s.userId, e.target.value as 'write' | 'read')}
+                        className="px-2 py-1 bg-neutral-700 border border-neutral-600 rounded-lg text-[11px] text-white focus:outline-none"
+                      >
+                        <option value="write">Can edit</option>
+                        <option value="read">Can view</option>
+                      </select>
+
+                      <button
+                        type="button"
+                        onClick={() => handleRemoveShare(s.id)}
+                        className="p-1 text-neutral-400 hover:text-red-400 rounded-lg hover:bg-neutral-700 transition"
+                        title="Remove collaborator"
+                      >
+                        <Trash2 className="w-3.5 h-3.5" />
+                      </button>
+                    </div>
+                  </div>
+                ))}
+              </div>
+            )}
+          </div>
+        </div>
+
+        {/* Footer */}
+        <div className="flex items-center justify-end px-6 py-3 border-t border-neutral-800 bg-neutral-900/80">
+          <button
+            type="button"
+            onClick={onClose}
+            className="px-4 py-1.5 rounded-xl text-xs font-semibold text-neutral-300 hover:text-white hover:bg-neutral-800 transition"
+          >
+            Done
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/lib/email.ts b/src/lib/email.ts
index ec38416..1f6d855 100644
--- a/src/lib/email.ts
+++ b/src/lib/email.ts
@@ -3,6 +3,7 @@ import { simpleParser } from 'mailparser';
 import { prisma, ensureDefaultNotebook, getCurrentUserId } from './prisma';
 import { getOrCreateNotebookByName, getOrCreateTagIds } from './importers';
 import { saveAttachmentBuffer, stripHtmlToText, makeExcerpt } from './storage';
+import { enqueueAttachmentOcr } from './ocr';
 
 /**
  * Parses Evernote's Email-to-Note Subject line syntax:
@@ -149,6 +150,10 @@ export async function ingestEmailToNote(
       },
     });
 
+    if (!savedBlob.extractedText) {
+      enqueueAttachmentOcr(createdAtt.id);
+    }
+
     const attUrl = `/api/attachments/${createdAtt.id}`;
     if (att.cid && bodyHtml.includes(`cid:${att.cid}`)) {
       bodyHtml = bodyHtml.split(`cid:${att.cid}`).join(attUrl);
diff --git a/src/lib/importers.ts b/src/lib/importers.ts
index a1da206..93f7a03 100644
--- a/src/lib/importers.ts
+++ b/src/lib/importers.ts
@@ -9,6 +9,7 @@ import {
   makeExcerpt,
   guessExtensionFromMime,
 } from './storage';
+import { enqueueAttachmentOcr } from './ocr';
 
 export function parseEvernoteTimestamp(ts?: string | null): Date | null {
   if (!ts) return null;
@@ -212,6 +213,10 @@ export async function saveParsedEnexNote(
       },
     });
 
+    if (!savedBlob.extractedText) {
+      enqueueAttachmentOcr(attachment.id);
+    }
+
     mediaByHash.set(savedBlob.md5Hash.toLowerCase(), {
       id: attachment.id,
       filename: attachment.filename,
@@ -651,6 +656,7 @@ export async function localizeClippedImages(
             storagePath: savedBlob.storagePath,
           },
         });
+        enqueueAttachmentOcr(att.id);
         urlToLocalSrc.set(remoteUrl, `/api/attachments/${att.id}`);
       } catch {
         // Keep remote URL if download fails
diff --git a/src/lib/ocr.ts b/src/lib/ocr.ts
new file mode 100644
index 0000000..dce44ba
--- /dev/null
+++ b/src/lib/ocr.ts
@@ -0,0 +1,141 @@
+import fs from 'fs/promises';
+import path from 'path';
+import { createWorker } from 'tesseract.js';
+import { prisma } from './prisma';
+import { getFullAttachmentPath } from './storage';
+
+// Safe lazy import of pdf-parse
+async function extractPdfText(buffer: Buffer): Promise<string | null> {
+  try {
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const { PDFParse } = require('pdf-parse');
+    const parser = new PDFParse({ data: buffer });
+    const res = await parser.getText();
+    const text = typeof res === 'string' ? res : res?.text || '';
+    const trimmed = text.trim();
+    return trimmed.length > 0 ? trimmed.slice(0, 100000) : null;
+  } catch (err) {
+    console.warn('PDF digital text extraction skipped/failed:', err);
+    return null;
+  }
+}
+
+/**
+ * Recognizes text inside an image using Tesseract OCR.
+ */
+export async function recognizeImageOcr(imageBufferOrPath: Buffer | string): Promise<string | null> {
+  let worker: Tesseract.Worker | null = null;
+  try {
+    worker = await createWorker('eng');
+    const ret = await worker.recognize(imageBufferOrPath);
+    const text = ret.data?.text?.trim() || '';
+    return text.length > 0 ? text.slice(0, 50000) : null;
+  } catch (err) {
+    console.error('Tesseract OCR error:', err);
+    return null;
+  } finally {
+    if (worker) {
+      try {
+        await worker.terminate();
+      } catch {}
+    }
+  }
+}
+
+/**
+ * Extracts searchable text from any supported attachment buffer (Text, Markdown, PDF, Image OCR).
+ */
+export async function extractTextFromAttachment(
+  buffer: Buffer,
+  mimeType: string,
+  filename: string
+): Promise<string | null> {
+  const lowerMime = mimeType.toLowerCase();
+  const lowerName = filename.toLowerCase();
+
+  // 1. Plain text / Markdown / CSV / JSON
+  if (
+    lowerMime.startsWith('text/') ||
+    lowerMime === 'application/json' ||
+    lowerMime === 'application/xml' ||
+    lowerName.endsWith('.md') ||
+    lowerName.endsWith('.txt') ||
+    lowerName.endsWith('.csv') ||
+    lowerName.endsWith('.json')
+  ) {
+    return buffer.toString('utf-8').slice(0, 50000).trim() || null;
+  }
+
+  // 2. Digital PDF extraction
+  if (lowerMime === 'application/pdf' || lowerName.endsWith('.pdf')) {
+    const pdfText = await extractPdfText(buffer);
+    if (pdfText) return pdfText;
+  }
+
+  // 3. Image OCR (JPEG, PNG, WebP, BMP, TIFF)
+  if (
+    lowerMime.startsWith('image/') ||
+    lowerName.endsWith('.jpg') ||
+    lowerName.endsWith('.jpeg') ||
+    lowerName.endsWith('.png') ||
+    lowerName.endsWith('.webp') ||
+    lowerName.endsWith('.bmp') ||
+    lowerName.endsWith('.tiff')
+  ) {
+    return await recognizeImageOcr(buffer);
+  }
+
+  return null;
+}
+
+/**
+ * Runs OCR / text extraction on an existing database Attachment record and updates its extractedText field.
+ */
+export async function runOcrOnAttachment(
+  attachmentId: string
+): Promise<{ text: string | null; success: boolean }> {
+  try {
+    const attachment = await prisma.attachment.findUnique({
+      where: { id: attachmentId },
+    });
+
+    if (!attachment) {
+      return { text: null, success: false };
+    }
+
+    const fullPath = getFullAttachmentPath(attachment.storagePath);
+    const buffer = await fs.readFile(fullPath);
+
+    const extracted = await extractTextFromAttachment(
+      buffer,
+      attachment.mimeType,
+      attachment.filename
+    );
+
+    if (extracted && extracted.trim()) {
+      await prisma.attachment.update({
+        where: { id: attachmentId },
+        data: { extractedText: extracted.trim() },
+      });
+      return { text: extracted.trim(), success: true };
+    }
+
+    return { text: null, success: true };
+  } catch (err) {
+    console.error(`runOcrOnAttachment failed for ${attachmentId}:`, err);
+    return { text: null, success: false };
+  }
+}
+
+/**
+ * Asynchronously enqueues an attachment for background OCR without blocking callers.
+ */
+export function enqueueAttachmentOcr(attachmentId: string): void {
+  setTimeout(async () => {
+    try {
+      await runOcrOnAttachment(attachmentId);
+    } catch (e) {
+      console.warn(`Background OCR for attachment ${attachmentId} failed:`, e);
+    }
+  }, 50);
+}
diff --git a/src/lib/search.ts b/src/lib/search.ts
index c291f08..804561d 100644
--- a/src/lib/search.ts
+++ b/src/lib/search.ts
@@ -111,7 +111,25 @@ export function buildNoteWhereClause(params: {
   const andConditions: Prisma.NoteWhereInput[] = [];
 
   if (params.userId) {
-    andConditions.push({ userId: params.userId });
+    if (params.notebookId) {
+      andConditions.push({
+        notebookId: params.notebookId,
+        OR: [
+          { userId: params.userId },
+          { notebook: { userId: params.userId } },
+          { notebook: { shares: { some: { userId: params.userId } } } },
+        ],
+      });
+    } else {
+      andConditions.push({
+        OR: [
+          { userId: params.userId },
+          { notebook: { shares: { some: { userId: params.userId } } } },
+        ],
+      });
+    }
+  } else if (params.notebookId) {
+    andConditions.push({ notebookId: params.notebookId });
   }
 
   andConditions.push({
@@ -126,10 +144,6 @@ export function buildNoteWhereClause(params: {
     andConditions.push({ isPinned: true });
   }
 
-  if (params.notebookId) {
-    andConditions.push({ notebookId: params.notebookId });
-  }
-
   if (params.stackId) {
     andConditions.push({
       notebook: { stackId: params.stackId },
diff --git a/src/types/everclone.ts b/src/types/everclone.ts
index 34f9de8..c15ae00 100644
--- a/src/types/everclone.ts
+++ b/src/types/everclone.ts
@@ -16,11 +16,42 @@ export interface NotebookStackItem {
 export interface NotebookItem {
   id: string;
   name: string;
+  userId?: string;
   stackId: string | null;
   isDefault: boolean;
   isShortcut: boolean;
   sortOrder: number;
   noteCount: number;
+  isShared?: boolean;
+  isOwner?: boolean;
+  shareRole?: 'owner' | 'write' | 'read';
+  sharesCount?: number;
+}
+
+export interface NotebookShareItem {
+  id: string;
+  notebookId: string;
+  userId: string;
+  role: 'read' | 'write';
+  createdAt: string;
+  user?: {
+    id: string;
+    name: string;
+    email: string;
+    avatarColor: string;
+  };
+}
+
+export interface NoteHistoryItem {
+  id: string;
+  noteId: string;
+  title: string;
+  excerpt: string;
+  wordCount: number;
+  createdBy?: string | null;
+  createdAt: string;
+  contentHtml?: string;
+  contentText?: string;
 }
 
 export interface SavedSearchItem {
@@ -39,6 +70,7 @@ export interface AttachmentItem {
   md5Hash: string;
   width?: number | null;
   height?: number | null;
+  extractedText?: string | null;
   createdAt: string;
 }
 
@@ -81,6 +113,7 @@ export interface NoteDetail extends NoteSummary {
   latitude: number | null;
   longitude: number | null;
   attachments: AttachmentItem[];
+  canEdit?: boolean;
 }
 
 export interface UserItem {