diff --git a/database/schema/schema.sql b/database/schema/schema.sql
index aca6ae7..f1e53b0 100644
--- a/database/schema/schema.sql
+++ b/database/schema/schema.sql
@@ -1344,8 +1344,10 @@ CREATE TABLE IF NOT EXISTS media_bookmarks (
   title VARCHAR(255) NOT NULL,
   position VARCHAR(100), -- 'pdf:page:45', 'comic:page:12', 'chapter:3' for consistency
   notes TEXT,
-  created_at TIMESTAMPTZ DEFAULT NOW(),
-  UNIQUE(media_item_id, user_id, title)
+  created_at TIMESTAMPTZ DEFAULT NOW()
+  -- No UNIQUE(media_item_id, user_id, title): bookmarks are identified by
+  -- their location (dedup_key), titles are display labels shared verbatim
+  -- across clients (KOReader auto-labels repeat within a chapter).
 );
 
 CREATE INDEX IF NOT EXISTS idx_media_bookmarks_media ON media_bookmarks(media_item_id);
@@ -1386,6 +1388,14 @@ ALTER TABLE media_bookmarks ADD COLUMN IF NOT EXISTS epubcfi_location TEXT;
 ALTER TABLE media_bookmarks ADD COLUMN IF NOT EXISTS chapter_reference INTEGER;
 ALTER TABLE media_bookmarks ADD COLUMN IF NOT EXISTS deleted BOOLEAN DEFAULT FALSE;
 ALTER TABLE media_bookmarks ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
+-- Provenance: the client that CREATED the bookmark (unlike
+-- last_modified_source, which tracks the last writer). Set once at insert.
+ALTER TABLE media_bookmarks ADD COLUMN IF NOT EXISTS origin_source VARCHAR(30);
+-- Identity is the dedup_key (location), not the title; drop the legacy
+-- unique-title constraint so same-title bookmarks on different pages can
+-- coexist (re-creating over a tombstone with a changed position also
+-- relied on this). Catalog-only change, safe to re-run.
+ALTER TABLE media_bookmarks DROP CONSTRAINT IF EXISTS media_bookmarks_media_item_id_user_id_title_key;
 
 CREATE UNIQUE INDEX IF NOT EXISTS idx_media_highlights_dedup
     ON media_highlights (user_id, media_item_id, dedup_key)
diff --git a/internal/database/models.go b/internal/database/models.go
index 1d937f6..5355e97 100644
--- a/internal/database/models.go
+++ b/internal/database/models.go
@@ -185,6 +185,7 @@ type MediaBookmarks struct {
 	ChapterReference   pgtype.Int4        `db:"chapter_reference" json:"chapter_reference"`
 	Deleted            pgtype.Bool        `db:"deleted" json:"deleted"`
 	DeletedAt          pgtype.Timestamptz `db:"deleted_at" json:"deleted_at"`
+	OriginSource       pgtype.Text        `db:"origin_source" json:"origin_source"`
 }
 
 type MediaHighlights struct {
diff --git a/internal/database/queries.sql.go b/internal/database/queries.sql.go
index 1541229..c16f6c7 100644
--- a/internal/database/queries.sql.go
+++ b/internal/database/queries.sql.go
@@ -624,7 +624,7 @@ func (q *Queries) CreateLibrary(ctx context.Context, arg CreateLibraryParams) (L
 const CreateMediaBookmark = `-- name: CreateMediaBookmark :one
 INSERT INTO media_bookmarks (media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes)
 VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
-RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at
+RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source
 `
 
 type CreateMediaBookmarkParams struct {
@@ -670,6 +670,7 @@ func (q *Queries) CreateMediaBookmark(ctx context.Context, arg CreateMediaBookma
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
@@ -680,10 +681,10 @@ INSERT INTO media_bookmarks (
     cfi_position, title, position, notes,
     percentage_location, epubcfi_location, chapter_reference,
     dedup_key, last_modified_at, last_modified_source,
-    device_sync_data
+    device_sync_data, origin_source
 ) VALUES (
-    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15
-) RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at
+    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16
+) RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source
 `
 
 type CreateMediaBookmarkFullParams struct {
@@ -702,6 +703,7 @@ type CreateMediaBookmarkFullParams struct {
 	LastModifiedAt     pgtype.Timestamptz `db:"last_modified_at" json:"last_modified_at"`
 	LastModifiedSource pgtype.Text        `db:"last_modified_source" json:"last_modified_source"`
 	DeviceSyncData     []byte             `db:"device_sync_data" json:"device_sync_data"`
+	OriginSource       pgtype.Text        `db:"origin_source" json:"origin_source"`
 }
 
 func (q *Queries) CreateMediaBookmarkFull(ctx context.Context, arg CreateMediaBookmarkFullParams) (MediaBookmarks, error) {
@@ -721,6 +723,7 @@ func (q *Queries) CreateMediaBookmarkFull(ctx context.Context, arg CreateMediaBo
 		arg.LastModifiedAt,
 		arg.LastModifiedSource,
 		arg.DeviceSyncData,
+		arg.OriginSource,
 	)
 	var i MediaBookmarks
 	err := row.Scan(
@@ -743,6 +746,7 @@ func (q *Queries) CreateMediaBookmarkFull(ctx context.Context, arg CreateMediaBo
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
@@ -4524,7 +4528,7 @@ func (q *Queries) GetLibraryWithType(ctx context.Context, id pgtype.UUID) (GetLi
 }
 
 const GetMediaBookmark = `-- name: GetMediaBookmark :one
-SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at FROM media_bookmarks WHERE id = $1
+SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source FROM media_bookmarks WHERE id = $1
 `
 
 func (q *Queries) GetMediaBookmark(ctx context.Context, id pgtype.UUID) (MediaBookmarks, error) {
@@ -4550,13 +4554,14 @@ func (q *Queries) GetMediaBookmark(ctx context.Context, id pgtype.UUID) (MediaBo
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
 
 const GetMediaBookmarkByDedupKey = `-- name: GetMediaBookmarkByDedupKey :one
 
-SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at FROM media_bookmarks
+SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source FROM media_bookmarks
 WHERE user_id = $1 AND media_item_id = $2 AND dedup_key = $3
 ORDER BY deleted ASC, deleted_at DESC NULLS LAST
 LIMIT 1
@@ -4594,12 +4599,13 @@ func (q *Queries) GetMediaBookmarkByDedupKey(ctx context.Context, arg GetMediaBo
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
 
 const GetMediaBookmarks = `-- name: GetMediaBookmarks :many
-SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at FROM media_bookmarks
+SELECT id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source FROM media_bookmarks
 WHERE media_item_id = $1 AND user_id = $2 AND COALESCE(deleted, FALSE) = FALSE
 ORDER BY created_at DESC
 `
@@ -4638,6 +4644,7 @@ func (q *Queries) GetMediaBookmarks(ctx context.Context, arg GetMediaBookmarksPa
 			&i.ChapterReference,
 			&i.Deleted,
 			&i.DeletedAt,
+			&i.OriginSource,
 		); err != nil {
 			return nil, err
 		}
@@ -11513,7 +11520,7 @@ SET
     position = $4,
     last_modified_at = NOW()
 WHERE id = $1 AND user_id = $5
-RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at
+RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source
 `
 
 type UpdateMediaBookmarkParams struct {
@@ -11553,6 +11560,7 @@ func (q *Queries) UpdateMediaBookmark(ctx context.Context, arg UpdateMediaBookma
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
@@ -11575,7 +11583,7 @@ UPDATE media_bookmarks SET
     deleted = FALSE,
     deleted_at = NULL
 WHERE id = $1
-RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at
+RETURNING id, media_item_id, user_id, page_number, chapter_number, cfi_position, title, position, notes, created_at, dedup_key, last_modified_at, last_modified_source, device_sync_data, percentage_location, epubcfi_location, chapter_reference, deleted, deleted_at, origin_source
 `
 
 type UpdateMediaBookmarkForSyncParams struct {
@@ -11631,6 +11639,7 @@ func (q *Queries) UpdateMediaBookmarkForSync(ctx context.Context, arg UpdateMedi
 		&i.ChapterReference,
 		&i.Deleted,
 		&i.DeletedAt,
+		&i.OriginSource,
 	)
 	return i, err
 }
diff --git a/internal/database/queries/queries.sql b/internal/database/queries/queries.sql
index 8681a0b..4c33b93 100644
--- a/internal/database/queries/queries.sql
+++ b/internal/database/queries/queries.sql
@@ -898,9 +898,9 @@ INSERT INTO media_bookmarks (
     cfi_position, title, position, notes,
     percentage_location, epubcfi_location, chapter_reference,
     dedup_key, last_modified_at, last_modified_source,
-    device_sync_data
+    device_sync_data, origin_source
 ) VALUES (
-    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15
+    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16
 ) RETURNING *;
 
 -- name: UpdateMediaBookmarkForSync :one
diff --git a/internal/handlers/koreader.go b/internal/handlers/koreader.go
index 2ea2a2c..30af02b 100644
--- a/internal/handlers/koreader.go
+++ b/internal/handlers/koreader.go
@@ -741,6 +741,7 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 			Position:       position,
 			ChapterNumber:  int32(bookmark.Chapter),
 			Source:         "koreader",
+			OriginSource:   "koreader",
 			DeviceSyncData: deviceData,
 			DedupKey:       dedupKey,
 		})
diff --git a/internal/handlers/media.go b/internal/handlers/media.go
index 3642ecf..e1924fa 100644
--- a/internal/handlers/media.go
+++ b/internal/handlers/media.go
@@ -152,6 +152,9 @@ type CreateMediaBookmarkRequest struct {
 	ChapterNumber    int32   `json:"chapter_number"`
 	Percentage       float64 `json:"percentage"`
 	ChapterReference int32   `json:"chapter_reference"`
+	// Origin labels the creating client for display ("android", "web").
+	// Optional: defaults to "web" for browser callers.
+	Origin string `json:"origin" validate:"omitempty,max=30"`
 }
 
 // UpdateMediaBookmarkRequest represents the request for updating a media bookmark
@@ -1750,6 +1753,10 @@ func (mh *MediaHandler) CreateMediaBookmark(c *echo.Context) error {
 	// The sync-aware path (dedup + LWW + tombstones) is preferred; fall back
 	// to the plain query when the service isn't wired (e.g. some tests).
 	if mh.annotationSvc != nil {
+		origin := req.Origin
+		if origin == "" {
+			origin = "web"
+		}
 		result, err := mh.annotationSvc.SaveBookmark(c.Request().Context(), wsync.SaveBookmarkRequest{
 			MediaItemID:      pgtype.UUID{Bytes: mediaUUID, Valid: true},
 			UserID:           pgtype.UUID{Bytes: userUUID, Valid: true},
@@ -1762,6 +1769,7 @@ func (mh *MediaHandler) CreateMediaBookmark(c *echo.Context) error {
 			PercentageLoc:    req.Percentage,
 			ChapterReference: req.ChapterReference,
 			Source:           "web",
+			OriginSource:     origin,
 			ModifiedAt:       time.Now(),
 		})
 		if err != nil {
diff --git a/internal/sync/annotations.go b/internal/sync/annotations.go
index 3746ff4..abae2fb 100644
--- a/internal/sync/annotations.go
+++ b/internal/sync/annotations.go
@@ -590,6 +590,9 @@ type SaveBookmarkRequest struct {
 	Source           string
 	ModifiedAt       time.Time
 	DeviceSyncData   json.RawMessage
+	// OriginSource records the client that created the bookmark (set once
+	// at insert; unlike Source it is not updated by later writers).
+	OriginSource string
 	// DedupKey overrides the computed key for device echoes (see
 	// SaveHighlightRequest).
 	DedupKey string
@@ -624,9 +627,9 @@ func (s *AnnotationService) SaveBookmark(ctx context.Context, req SaveBookmarkRe
 		if !incomingNewerThanTombstone(req.ModifiedAt, existing.DeletedAt, existing.LastModifiedAt) {
 			return &SaveBookmarkResult{Bookmark: existing, Outcome: SaveOutcomeDeleted}, nil
 		}
-		// Newer than the tombstone: a deliberate re-create. Resurrect via the
-		// LWW update instead of INSERT (the tombstoned row still holds the
-		// UNIQUE(media_item_id, user_id, title) slot).
+		// Newer than the tombstone: a deliberate re-create at the same
+		// location. Resurrect via the LWW update so the row keeps its id
+		// and origin.
 		return s.applyBookmarkLWW(ctx, req, existing, dedupKey)
 	}
 
@@ -656,6 +659,7 @@ func (s *AnnotationService) createBookmark(ctx context.Context, req SaveBookmark
 		LastModifiedAt:     pgtype.Timestamptz{Time: modifiedAt, Valid: true},
 		LastModifiedSource: pgtype.Text{String: req.Source, Valid: req.Source != ""},
 		DeviceSyncData:     deviceData,
+		OriginSource:       pgText(req.OriginSource),
 	})
 	if err != nil {
 		return nil, fmt.Errorf("create bookmark: %w", err)
diff --git a/templates/reader.templ b/templates/reader.templ
index 60a04a2..39c46ca 100644
--- a/templates/reader.templ
+++ b/templates/reader.templ
@@ -730,10 +730,33 @@ templ ReaderAnnotationsDrawer() {
 						href="#"
 						@click.prevent="goToBookmark(bookmark)"
 						class="flex-1 min-w-0 block py-2 hover:bg-gray-700 rounded px-2"
+						x-show="!bookmark.renameOpen"
 					>
 						<span class="font-medium block truncate" x-text="bookmark.title"></span>
 						<span class="text-xs block truncate" style="color: var(--text-secondary)" x-text="bookmark.positionLabel"></span>
 					</a>
+					<div class="flex-1 min-w-0 py-2" x-show="bookmark.renameOpen" @click.stop>
+						<input
+							type="text"
+							class="reader-note-input"
+							x-model="bookmark.renameText"
+							@keydown.enter="renameBookmark(bookmark)"
+							@keydown.escape="bookmark.renameOpen = false"
+							placeholder="Bookmark name…"
+						></input>
+						<div class="flex gap-2 mt-1">
+							<button @click="renameBookmark(bookmark)" class="flex-1 py-1 text-xs bg-blue-600 text-white rounded hover:bg-blue-700">Save</button>
+							<button @click="bookmark.renameOpen = false" class="flex-1 py-1 text-xs border rounded hover:opacity-80" style="border-color: var(--border);">Cancel</button>
+						</div>
+					</div>
+					<button
+						@click="startBookmarkRename(bookmark)"
+						class="p-2 rounded hover:bg-gray-600 opacity-0 group-hover:opacity-100 transition-opacity"
+						title="Rename bookmark"
+						aria-label="Rename bookmark"
+					>
+						✎
+					</button>
 					<button
 						@click="deleteBookmark(bookmark.id)"
 						class="p-2 rounded hover:bg-red-900/60 opacity-0 group-hover:opacity-100 transition-opacity"
diff --git a/web/src/reader/reader.ts b/web/src/reader/reader.ts
index bcec0e7..71598df 100644
--- a/web/src/reader/reader.ts
+++ b/web/src/reader/reader.ts
@@ -472,6 +472,8 @@ document.addEventListener("alpine:init", () => {
       positionLabel: string;
       cfi: string;
       page: number | null;
+      renameOpen?: boolean;
+      renameText?: string;
     }[],
     tocItems: [] as any[],
     mediaItemId: "" as string,
@@ -2079,6 +2081,14 @@ document.addEventListener("alpine:init", () => {
       const page = this.isFixedLayout
         ? (this.renderer?.index ?? 0) + 1
         : 0;
+      // Auto-label mirrors KOReader's convention ("in <chapter title>")
+      // so every client names unnamed bookmarks identically; falls back
+      // to a plain "Bookmark" for fixed-layout or TOC-less books.
+      const chapter = this.lastRelocateDetail?.tocItem?.label as
+        | string
+        | undefined;
+      const title =
+        !this.isFixedLayout && chapter ? `in ${chapter}` : "Bookmark";
 
       try {
         const resp = await fetch(
@@ -2090,7 +2100,7 @@ document.addEventListener("alpine:init", () => {
               "Content-Type": "application/json",
             },
             body: JSON.stringify({
-              title: `Bookmark at ${this.progressText || "current position"}`,
+              title,
               position: this.isFixedLayout
                 ? `page:${page}`
                 : cfi
@@ -2130,6 +2140,38 @@ document.addEventListener("alpine:init", () => {
         /* ignore bookmark errors for now */
       }
     },
+    startBookmarkRename(bookmark: (typeof this.bookmarkItems)[number]) {
+      bookmark.renameOpen = true;
+      bookmark.renameText = bookmark.title;
+    },
+    async renameBookmark(bookmark: (typeof this.bookmarkItems)[number]) {
+      const token = getToken();
+      const title = (bookmark.renameText ?? "").trim();
+      if (!token || !this.mediaItemId || !title) return;
+      try {
+        const resp = await fetch(
+          `/api/media-items/${this.mediaItemId}/bookmarks/${bookmark.id}`,
+          {
+            method: "PUT",
+            headers: {
+              Authorization: `Bearer ${token}`,
+              "Content-Type": "application/json",
+            },
+            body: JSON.stringify({
+              title,
+              notes: "",
+              position: bookmark.positionLabel || "",
+            }),
+          },
+        );
+        if (resp.ok) {
+          bookmark.title = title;
+        }
+        bookmark.renameOpen = false;
+      } catch (_e) {
+        bookmark.renameOpen = false;
+      }
+    },
     chapterNumberForProgress(): number {
       const tocItem = this.lastRelocateDetail?.tocItem;
       if (!tocItem?.label) return 0;