diff --git a/backend/cmd/webui/api/router.go b/backend/cmd/webui/api/router.go
index 3c86f0f..98fe02a 100644
--- a/backend/cmd/webui/api/router.go
+++ b/backend/cmd/webui/api/router.go
@@ -53,5 +53,9 @@ func NewRouter(cfg *config.Config, st *store.Store, rdb *redispkg.R, sc *scanner
 	p.GET("/books/:id/pages/:n", h.Page)
 	p.PUT("/books/:id/progress", h.PutProgress)
 	p.GET("/progress", h.ListProgress)
+	p.GET("/books/:id/bookmarks", h.ListBookmarks)
+	p.POST("/books/:id/bookmarks", h.CreateBookmark)
+	p.PATCH("/bookmarks/:id", h.PatchBookmark)
+	p.DELETE("/bookmarks/:id", h.DeleteBookmark)
 	return r
 }
diff --git a/backend/cmd/webui/handlers/bookmarks.go b/backend/cmd/webui/handlers/bookmarks.go
new file mode 100644
index 0000000..507f74d
--- /dev/null
+++ b/backend/cmd/webui/handlers/bookmarks.go
@@ -0,0 +1,131 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"time"
+	"unicode/utf8"
+
+	"github.com/gin-gonic/gin"
+
+	"booklib/internal/store"
+)
+
+const maxNoteRunes = 500
+
+func bookmarkJSON(b store.Bookmark) gin.H {
+	return gin.H{
+		"id": b.ID, "library_id": b.LibraryID, "path": b.BookPath,
+		"locator": json.RawMessage(b.Locator), "percent": b.Percent,
+		"note": b.Note, "created_at": b.CreatedAt.Format(time.RFC3339),
+	}
+}
+
+func (h *H) ListBookmarks(c *gin.Context) {
+	b, ok := h.bookFromParam(c)
+	if !ok {
+		return
+	}
+	rows, e := h.st.ListBookmarks(c, uid(c), b.LibraryID, b.Path)
+	if e != nil {
+		dbErr(c, e)
+		return
+	}
+	out := make([]gin.H, 0, len(rows))
+	for _, r := range rows {
+		out = append(out, bookmarkJSON(r))
+	}
+	c.JSON(http.StatusOK, out)
+}
+
+func (h *H) CreateBookmark(c *gin.Context) {
+	b, ok := h.bookFromParam(c)
+	if !ok {
+		return
+	}
+	var req struct {
+		Locator json.RawMessage `json:"locator"`
+		Percent float64         `json:"percent"`
+		Note    string          `json:"note"`
+	}
+	if e := c.ShouldBindJSON(&req); e != nil {
+		err(c, http.StatusBadRequest, "bad_request", "json body required")
+		return
+	}
+	if len(req.Locator) == 0 || string(req.Locator) == "null" || !json.Valid(req.Locator) {
+		err(c, http.StatusBadRequest, "bad_request", "locator must be valid json")
+		return
+	}
+	if req.Percent < 0 || req.Percent > 1 {
+		err(c, http.StatusBadRequest, "bad_request", "percent must be in [0,1]")
+		return
+	}
+	if utf8.RuneCountInString(req.Note) > maxNoteRunes {
+		err(c, http.StatusBadRequest, "bad_request", "note too long (max 500 characters)")
+		return
+	}
+	id, e := h.st.InsertBookmark(c, uid(c), b.LibraryID, b.Path, req.Locator, req.Percent, req.Note)
+	if e != nil {
+		dbErr(c, e)
+		return
+	}
+	c.JSON(http.StatusCreated, bookmarkJSON(store.Bookmark{
+		ID: id, LibraryID: b.LibraryID, BookPath: b.Path,
+		Locator: req.Locator, Percent: req.Percent, Note: req.Note, CreatedAt: time.Now(),
+	}))
+}
+
+func bookmarkID(c *gin.Context) (int64, bool) {
+	id, e := strconv.ParseInt(c.Param("id"), 10, 64)
+	if e != nil {
+		err(c, http.StatusBadRequest, "bad_request", "bad id")
+		return 0, false
+	}
+	return id, true
+}
+
+func (h *H) PatchBookmark(c *gin.Context) {
+	id, ok := bookmarkID(c)
+	if !ok {
+		return
+	}
+	var req struct {
+		Note string `json:"note"`
+	}
+	if e := c.ShouldBindJSON(&req); e != nil {
+		err(c, http.StatusBadRequest, "bad_request", "json body required")
+		return
+	}
+	if utf8.RuneCountInString(req.Note) > maxNoteRunes {
+		err(c, http.StatusBadRequest, "bad_request", "note too long (max 500 characters)")
+		return
+	}
+	updated, e := h.st.UpdateBookmarkNote(c, uid(c), id, req.Note)
+	if e != nil {
+		dbErr(c, e)
+		return
+	}
+	if !updated {
+		err(c, http.StatusNotFound, "not_found", "no such bookmark")
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"id": id, "note": req.Note})
+}
+
+func (h *H) DeleteBookmark(c *gin.Context) {
+	id, ok := bookmarkID(c)
+	if !ok {
+		return
+	}
+	deleted, e := h.st.DeleteBookmark(c, uid(c), id)
+	if e != nil {
+		dbErr(c, e)
+		return
+	}
+	if !deleted {
+		err(c, http.StatusNotFound, "not_found", "no such bookmark")
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
diff --git a/backend/cmd/webui/handlers/bookmarks_test.go b/backend/cmd/webui/handlers/bookmarks_test.go
new file mode 100644
index 0000000..fed34ef
--- /dev/null
+++ b/backend/cmd/webui/handlers/bookmarks_test.go
@@ -0,0 +1,88 @@
+package handlers_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestBookmarkCRUDAndOwnership(t *testing.T) {
+	st, sc, h, booksDir := setupAPI(t)
+	tok := adminToken(t, h)
+	lib, root := newLibrary(t, st, h, tok, booksDir, "bm")
+	writeCBZ(t, root+"/x.cbz", 5)
+	scanNow(t, sc, lib)
+	bs := []map[string]any{}
+	json.Unmarshal(do(h, "GET", "/api/books?q=x", tok, nil).Body.Bytes(), &bs)
+	bid := itoa(bs[0]["id"])
+
+	w := do(h, "POST", "/api/books/"+bid+"/bookmarks", tok,
+		map[string]any{"locator": map[string]int{"page": 3}, "percent": 0.6, "note": "伏笔"})
+	if w.Code != 201 {
+		t.Fatalf("create %d %s", w.Code, w.Body)
+	}
+	var bm map[string]any
+	json.Unmarshal(w.Body.Bytes(), &bm)
+	bmID := itoa(bm["id"])
+	if bm["note"] != "伏笔" {
+		t.Fatalf("echo: %s", w.Body)
+	}
+
+	// 第二本书 + 第二条书签:列表按 percent 升序且不跨书泄漏
+	writeCBZ(t, fmt.Sprintf("%s/y.cbz", root), 5)
+	scanNow(t, sc, lib)
+	bs = nil
+	json.Unmarshal(do(h, "GET", "/api/books?q=y", tok, nil).Body.Bytes(), &bs)
+	yid := itoa(bs[0]["id"])
+	do(h, "POST", "/api/books/"+bid+"/bookmarks", tok,
+		map[string]any{"locator": map[string]int{"page": 1}, "percent": 0.2})
+	arr := []map[string]any{}
+	json.Unmarshal(do(h, "GET", "/api/books/"+bid+"/bookmarks", tok, nil).Body.Bytes(), &arr)
+	if len(arr) != 2 || arr[0]["percent"].(float64) > arr[1]["percent"].(float64) {
+		t.Fatalf("list order/scope: %v", arr)
+	}
+	if w := do(h, "GET", "/api/books/"+yid+"/bookmarks", tok, nil); strings.TrimSpace(w.Body.String()) != "[]" {
+		t.Fatalf("other book leak: %s", w.Body)
+	}
+
+	if w := do(h, "PATCH", "/api/bookmarks/"+bmID, tok, map[string]string{"note": "改了"}); w.Code != 200 {
+		t.Fatalf("patch %d %s", w.Code, w.Body)
+	}
+
+	// 校验:note 超长 / percent 越界 / locator 缺失
+	if w := do(h, "POST", "/api/books/"+bid+"/bookmarks", tok,
+		map[string]any{"locator": map[string]int{"page": 1}, "percent": 0.5, "note": strings.Repeat("字", 501)}); w.Code != 400 {
+		t.Fatalf("long note want 400 got %d", w.Code)
+	}
+	if w := do(h, "POST", "/api/books/"+bid+"/bookmarks", tok,
+		map[string]any{"locator": map[string]int{"page": 1}, "percent": 1.5}); w.Code != 400 {
+		t.Fatalf("percent want 400 got %d", w.Code)
+	}
+	if w := do(h, "POST", "/api/books/"+bid+"/bookmarks", tok,
+		map[string]any{"percent": 0.5}); w.Code != 400 {
+		t.Fatalf("locator required got %d", w.Code)
+	}
+
+	// 所有权:member carl 看不见/改不了/删不了 alice 的书签
+	do(h, "POST", "/api/users", tok, map[string]string{"username": "carl", "password": testPW, "role": "member"})
+	lr := map[string]string{}
+	json.Unmarshal(do(h, "POST", "/api/auth/login", "", map[string]string{"username": "carl", "password": testPW}).Body.Bytes(), &lr)
+	bt := lr["token"]
+	if w := do(h, "GET", "/api/books/"+bid+"/bookmarks", bt, nil); strings.TrimSpace(w.Body.String()) != "[]" {
+		t.Fatalf("cross-user leak: %s", w.Body)
+	}
+	if w := do(h, "PATCH", "/api/bookmarks/"+bmID, bt, map[string]string{"note": "抢"}); w.Code != 404 {
+		t.Fatalf("cross-user patch want 404 got %d", w.Code)
+	}
+	if w := do(h, "DELETE", "/api/bookmarks/"+bmID, bt, nil); w.Code != 404 {
+		t.Fatalf("cross-user delete want 404 got %d", w.Code)
+	}
+
+	if w := do(h, "DELETE", "/api/bookmarks/"+bmID, tok, nil); w.Code != 204 {
+		t.Fatalf("delete %d", w.Code)
+	}
+	if w := do(h, "DELETE", "/api/bookmarks/"+bmID, tok, nil); w.Code != 404 {
+		t.Fatalf("re-delete want 404 got %d", w.Code)
+	}
+}
diff --git a/backend/internal/db/schema.sql b/backend/internal/db/schema.sql
index 6fa08a2..53d0cab 100644
--- a/backend/internal/db/schema.sql
+++ b/backend/internal/db/schema.sql
@@ -19,3 +19,11 @@ CREATE TABLE IF NOT EXISTS reading_progress (
   locator JSONB NOT NULL DEFAULT '{}', percent DOUBLE PRECISION NOT NULL DEFAULT 0,
   updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
   PRIMARY KEY (user_id, library_id, book_path));
+CREATE TABLE IF NOT EXISTS bookmarks (
+  id BIGSERIAL PRIMARY KEY,
+  user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  library_id BIGINT NOT NULL, book_path TEXT NOT NULL,
+  locator JSONB NOT NULL, percent DOUBLE PRECISION NOT NULL DEFAULT 0,
+  note TEXT NOT NULL DEFAULT '',
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now());
+CREATE INDEX IF NOT EXISTS bookmarks_user_book_idx ON bookmarks (user_id, library_id, book_path);
diff --git a/backend/internal/store/store.go b/backend/internal/store/store.go
index 4b98dbe..f365f97 100644
--- a/backend/internal/store/store.go
+++ b/backend/internal/store/store.go
@@ -314,6 +314,57 @@ func (s *Store) ListProgress(ctx context.Context, userID int64) ([]Progress, err
 	return out, rows.Err()
 }
 
+// ---------- bookmarks ----------
+
+type Bookmark struct {
+	ID        int64
+	LibraryID int64
+	BookPath  string
+	Locator   []byte
+	Percent   float64
+	Note      string
+	CreatedAt time.Time
+}
+
+func (s *Store) InsertBookmark(ctx context.Context, userID, libID int64, bookPath string, locator []byte, percent float64, note string) (int64, error) {
+	var id int64
+	err := s.P.QueryRow(ctx,
+		`INSERT INTO bookmarks (user_id, library_id, book_path, locator, percent, note)
+		 VALUES ($1,$2,$3,$4,$5,$6) RETURNING id`,
+		userID, libID, bookPath, locator, percent, note).Scan(&id)
+	return id, err
+}
+
+func (s *Store) ListBookmarks(ctx context.Context, userID, libID int64, bookPath string) ([]Bookmark, error) {
+	rows, err := s.P.Query(ctx,
+		`SELECT id, library_id, book_path, locator, percent, note, created_at
+		 FROM bookmarks WHERE user_id=$1 AND library_id=$2 AND book_path=$3
+		 ORDER BY percent ASC, id ASC`, userID, libID, bookPath)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []Bookmark
+	for rows.Next() {
+		var b Bookmark
+		if err := rows.Scan(&b.ID, &b.LibraryID, &b.BookPath, &b.Locator, &b.Percent, &b.Note, &b.CreatedAt); err != nil {
+			return nil, err
+		}
+		out = append(out, b)
+	}
+	return out, rows.Err()
+}
+
+func (s *Store) UpdateBookmarkNote(ctx context.Context, userID, id int64, note string) (bool, error) {
+	res, err := s.P.Exec(ctx, `UPDATE bookmarks SET note=$3 WHERE id=$1 AND user_id=$2`, id, userID, note)
+	return res.RowsAffected() > 0, err
+}
+
+func (s *Store) DeleteBookmark(ctx context.Context, userID, id int64) (bool, error) {
+	res, err := s.P.Exec(ctx, `DELETE FROM bookmarks WHERE id=$1 AND user_id=$2`, id, userID)
+	return res.RowsAffected() > 0, err
+}
+
 func (s *Store) GetProgress(ctx context.Context, userID, libID int64, bookPath string) (Progress, error) {
 	var pr Progress
 	err := s.P.QueryRow(ctx,