diff --git a/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/[chunkId]/route.ts b/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/[chunkId]/route.ts
index 08c02d508b6..aae50974041 100644
--- a/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/[chunkId]/route.ts
+++ b/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/[chunkId]/route.ts
@@ -95,6 +95,16 @@ export async function PUT(
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
+    if (accessCheck.document?.connectorId) {
+      logger.warn(
+        `[${requestId}] User ${session.user.id} attempted to update chunk on connector-synced document: Doc=${documentId}`
+      )
+      return NextResponse.json(
+        { error: 'Chunks from connector-synced documents are read-only' },
+        { status: 403 }
+      )
+    }
+
     const body = await req.json()
 
     try {
@@ -167,6 +177,16 @@ export async function DELETE(
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
+    if (accessCheck.document?.connectorId) {
+      logger.warn(
+        `[${requestId}] User ${session.user.id} attempted to delete chunk on connector-synced document: Doc=${documentId}`
+      )
+      return NextResponse.json(
+        { error: 'Chunks from connector-synced documents are read-only' },
+        { status: 403 }
+      )
+    }
+
     await deleteChunk(chunkId, documentId, requestId)
 
     logger.info(
diff --git a/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/route.ts b/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/route.ts
index c7979d41b00..762f9be66cf 100644
--- a/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/route.ts
+++ b/apps/sim/app/api/knowledge/[id]/documents/[documentId]/chunks/route.ts
@@ -158,6 +158,16 @@ export async function POST(
       return NextResponse.json({ error: 'Document not found' }, { status: 404 })
     }
 
+    if (doc.connectorId) {
+      logger.warn(
+        `[${requestId}] User ${userId} attempted to create chunk on connector-synced document: Doc=${documentId}`
+      )
+      return NextResponse.json(
+        { error: 'Chunks from connector-synced documents are read-only' },
+        { status: 403 }
+      )
+    }
+
     // Allow manual chunk creation even if document is not fully processed
     // but it should exist and not be in failed state
     if (doc.processingStatus === 'failed') {
@@ -283,6 +293,16 @@ export async function PATCH(
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
+    if (accessCheck.document?.connectorId) {
+      logger.warn(
+        `[${requestId}] User ${userId} attempted batch chunk operation on connector-synced document: Doc=${documentId}`
+      )
+      return NextResponse.json(
+        { error: 'Chunks from connector-synced documents are read-only' },
+        { status: 403 }
+      )
+    }
+
     const body = await req.json()
 
     try {
diff --git a/apps/sim/app/api/knowledge/utils.ts b/apps/sim/app/api/knowledge/utils.ts
index 7a2f82d071c..8b6d89fdde7 100644
--- a/apps/sim/app/api/knowledge/utils.ts
+++ b/apps/sim/app/api/knowledge/utils.ts
@@ -56,6 +56,8 @@ export interface DocumentData {
   boolean1?: boolean | null
   boolean2?: boolean | null
   boolean3?: boolean | null
+  // Connector fields
+  connectorId?: string | null
 }
 
 export interface EmbeddingData {
@@ -283,6 +285,8 @@ export async function checkDocumentWriteAccess(
       boolean1: document.boolean1,
       boolean2: document.boolean2,
       boolean3: document.boolean3,
+      // Connector fields
+      connectorId: document.connectorId,
     })
     .from(document)
     .where(and(eq(document.id, documentId), isNull(document.deletedAt)))
diff --git a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/chunk-context-menu/chunk-context-menu.tsx b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/chunk-context-menu/chunk-context-menu.tsx
index 4586b3306fd..4c0067fc1ff 100644
--- a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/chunk-context-menu/chunk-context-menu.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/chunk-context-menu/chunk-context-menu.tsx
@@ -45,6 +45,10 @@ interface ChunkContextMenuProps {
    * Whether add chunk is disabled
    */
   disableAddChunk?: boolean
+  /**
+   * Whether the document is synced from a connector (chunks are read-only)
+   */
+  isConnectorDocument?: boolean
   /**
    * Number of selected chunks (for batch operations)
    */
@@ -80,6 +84,7 @@ export function ChunkContextMenu({
   disableToggleEnabled = false,
   disableDelete = false,
   disableAddChunk = false,
+  isConnectorDocument = false,
   selectedCount = 1,
   enabledCount = 0,
   disabledCount = 0,
@@ -134,7 +139,7 @@ export function ChunkContextMenu({
                   onClose()
                 }}
               >
-                Edit
+                {isConnectorDocument ? 'View' : 'Edit'}
               </PopoverItem>
             )}
             {!isMultiSelect && onCopyContent && (
diff --git a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/edit-chunk-modal/edit-chunk-modal.tsx b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/edit-chunk-modal/edit-chunk-modal.tsx
index 643faa53a3c..0534ba5f9e3 100644
--- a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/edit-chunk-modal/edit-chunk-modal.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/components/edit-chunk-modal/edit-chunk-modal.tsx
@@ -50,6 +50,8 @@ export function EditChunkModal({
   maxChunkSize,
 }: EditChunkModalProps) {
   const userPermissions = useUserPermissionsContext()
+  const isConnectorDocument = Boolean(document?.connectorId)
+  const canEditChunk = userPermissions.canEdit && !isConnectorDocument
   const {
     mutate: updateChunk,
     isPending: isSaving,
@@ -186,7 +188,9 @@ export function EditChunkModal({
         <ModalContent size='lg'>
           <ModalHeader>
             <div className='flex items-center gap-[8px]'>
-              <span>Edit Chunk #{chunk.chunkIndex}</span>
+              <span>
+                {canEditChunk ? 'Edit' : 'View'} Chunk #{chunk.chunkIndex}
+              </span>
               {/* Navigation Controls */}
               <div className='flex items-center gap-[6px]'>
                 <Tooltip.Root>
@@ -270,11 +274,15 @@ export function EditChunkModal({
                     value={editedContent}
                     onChange={(e) => setEditedContent(e.target.value)}
                     placeholder={
-                      userPermissions.canEdit ? 'Enter chunk content...' : 'Read-only view'
+                      canEditChunk
+                        ? 'Enter chunk content...'
+                        : isConnectorDocument
+                          ? 'This chunk is synced from a connector and cannot be edited'
+                          : 'Read-only view'
                     }
                     rows={20}
-                    disabled={isSaving || isNavigating || !userPermissions.canEdit}
-                    readOnly={!userPermissions.canEdit}
+                    disabled={isSaving || isNavigating || !canEditChunk}
+                    readOnly={!canEditChunk}
                   />
                 )}
               </div>
@@ -306,7 +314,7 @@ export function EditChunkModal({
               >
                 Cancel
               </Button>
-              {userPermissions.canEdit && (
+              {canEditChunk && (
                 <Button
                   variant='tertiary'
                   onClick={handleSaveContent}
diff --git a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/document.tsx b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/document.tsx
index e02ff501844..e1dd9cf02d8 100644
--- a/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/document.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/knowledge/[id]/[documentId]/document.tsx
@@ -384,6 +384,7 @@ export function Document({
 
   const combinedError = documentError || searchError || initialError
 
+  const isConnectorDocument = Boolean(documentData?.connectorId)
   const effectiveKnowledgeBaseName = knowledgeBase?.name || knowledgeBaseName || 'Knowledge Base'
   const effectiveDocumentName = documentData?.filename || documentName || 'Document'
 
@@ -781,7 +782,9 @@ export function Document({
                   <Button
                     onClick={() => setIsCreateChunkModalOpen(true)}
                     disabled={
-                      documentData?.processingStatus === 'failed' || !userPermissions.canEdit
+                      documentData?.processingStatus === 'failed' ||
+                      !userPermissions.canEdit ||
+                      isConnectorDocument
                     }
                     variant='tertiary'
                     className='h-[32px] rounded-[6px]'
@@ -792,6 +795,11 @@ export function Document({
                 {!userPermissions.canEdit && (
                   <Tooltip.Content>Write permission required to create chunks</Tooltip.Content>
                 )}
+                {userPermissions.canEdit && isConnectorDocument && (
+                  <Tooltip.Content>
+                    Chunks from connector-synced documents are read-only
+                  </Tooltip.Content>
+                )}
               </Tooltip.Root>
             </div>
           </div>
@@ -830,7 +838,8 @@ export function Document({
                           onCheckedChange={handleSelectAll}
                           disabled={
                             documentData?.processingStatus !== 'completed' ||
-                            !userPermissions.canEdit
+                            !userPermissions.canEdit ||
+                            isConnectorDocument
                           }
                           aria-label='Select all chunks'
                         />
@@ -917,7 +926,7 @@ export function Document({
                                 onCheckedChange={(checked) =>
                                   handleSelectChunk(chunk.id, checked as boolean)
                                 }
-                                disabled={!userPermissions.canEdit}
+                                disabled={!userPermissions.canEdit || isConnectorDocument}
                                 aria-label={`Select chunk ${chunk.chunkIndex}`}
                                 onClick={(e) => e.stopPropagation()}
                               />
@@ -957,7 +966,7 @@ export function Document({
                                       e.stopPropagation()
                                       handleToggleEnabled(chunk.id)
                                     }}
-                                    disabled={!userPermissions.canEdit}
+                                    disabled={!userPermissions.canEdit || isConnectorDocument}
                                     className='h-[28px] w-[28px] p-0 text-[var(--text-muted)] hover:text-[var(--text-primary)] disabled:opacity-50'
                                   >
                                     {chunk.enabled ? (
@@ -970,9 +979,11 @@ export function Document({
                                 <Tooltip.Content side='top'>
                                   {!userPermissions.canEdit
                                     ? 'Write permission required to modify chunks'
-                                    : chunk.enabled
-                                      ? 'Disable Chunk'
-                                      : 'Enable Chunk'}
+                                    : isConnectorDocument
+                                      ? 'Connector-synced chunks are read-only'
+                                      : chunk.enabled
+                                        ? 'Disable Chunk'
+                                        : 'Enable Chunk'}
                                 </Tooltip.Content>
                               </Tooltip.Root>
                               <Tooltip.Root>
@@ -983,7 +994,7 @@ export function Document({
                                       e.stopPropagation()
                                       handleDeleteChunk(chunk.id)
                                     }}
-                                    disabled={!userPermissions.canEdit}
+                                    disabled={!userPermissions.canEdit || isConnectorDocument}
                                     className='h-[28px] w-[28px] p-0 text-[var(--text-muted)] hover:text-[var(--text-error)] disabled:opacity-50'
                                   >
                                     <Trash className='h-[14px] w-[14px]' />
@@ -992,7 +1003,9 @@ export function Document({
                                 <Tooltip.Content side='top'>
                                   {!userPermissions.canEdit
                                     ? 'Write permission required to delete chunks'
-                                    : 'Delete Chunk'}
+                                    : isConnectorDocument
+                                      ? 'Connector-synced chunks are read-only'
+                                      : 'Delete Chunk'}
                                 </Tooltip.Content>
                               </Tooltip.Root>
                             </div>
@@ -1114,9 +1127,9 @@ export function Document({
       {/* Bulk Action Bar */}
       <ActionBar
         selectedCount={selectedChunks.size}
-        onEnable={disabledCount > 0 ? handleBulkEnable : undefined}
-        onDisable={enabledCount > 0 ? handleBulkDisable : undefined}
-        onDelete={handleBulkDelete}
+        onEnable={disabledCount > 0 && !isConnectorDocument ? handleBulkEnable : undefined}
+        onDisable={enabledCount > 0 && !isConnectorDocument ? handleBulkDisable : undefined}
+        onDelete={!isConnectorDocument ? handleBulkDelete : undefined}
         enabledCount={enabledCount}
         disabledCount={disabledCount}
         isLoading={isBulkOperating}
@@ -1197,7 +1210,7 @@ export function Document({
             : undefined
         }
         onToggleEnabled={
-          contextMenuChunk && userPermissions.canEdit
+          contextMenuChunk && userPermissions.canEdit && !isConnectorDocument
             ? selectedChunks.size > 1
               ? () => {
                   if (disabledCount > 0) {
@@ -1210,20 +1223,27 @@ export function Document({
             : undefined
         }
         onDelete={
-          contextMenuChunk && userPermissions.canEdit
+          contextMenuChunk && userPermissions.canEdit && !isConnectorDocument
             ? selectedChunks.size > 1
               ? handleBulkDelete
               : () => handleDeleteChunk(contextMenuChunk.id)
             : undefined
         }
         onAddChunk={
-          userPermissions.canEdit && documentData?.processingStatus !== 'failed'
+          userPermissions.canEdit &&
+          documentData?.processingStatus !== 'failed' &&
+          !isConnectorDocument
             ? () => setIsCreateChunkModalOpen(true)
             : undefined
         }
-        disableToggleEnabled={!userPermissions.canEdit}
-        disableDelete={!userPermissions.canEdit}
-        disableAddChunk={!userPermissions.canEdit || documentData?.processingStatus === 'failed'}
+        disableToggleEnabled={!userPermissions.canEdit || isConnectorDocument}
+        disableDelete={!userPermissions.canEdit || isConnectorDocument}
+        disableAddChunk={
+          !userPermissions.canEdit ||
+          documentData?.processingStatus === 'failed' ||
+          isConnectorDocument
+        }
+        isConnectorDocument={isConnectorDocument}
       />
     </div>
   )