diff --git a/internal/sync/queue.go b/internal/sync/queue.go
index e4ad5d9..b7822e0 100644
--- a/internal/sync/queue.go
+++ b/internal/sync/queue.go
@@ -35,11 +35,12 @@ const (
 )
 
 type SyncQueueProcessor struct {
-	db           *database.Queries
-	progressSvc  *ProgressService
-	progressChan chan *ProgressUpdate
-	interval     time.Duration
-	batchSize    int
+	db            *database.Queries
+	progressSvc   *ProgressService
+	annotationSvc *AnnotationService
+	progressChan  chan *ProgressUpdate
+	interval      time.Duration
+	batchSize     int
 }
 
 type ProgressUpdate struct {
@@ -85,6 +86,10 @@ func (p *SyncQueueProcessor) SetProgressService(svc *ProgressService) {
 	p.progressSvc = svc
 }
 
+func (p *SyncQueueProcessor) SetAnnotationService(svc *AnnotationService) {
+	p.annotationSvc = svc
+}
+
 func (p *SyncQueueProcessor) Start(ctx context.Context) {
 	log.Printf("Starting sync queue processor (interval: %v, batch: %d)", p.interval, p.batchSize)
 
@@ -113,6 +118,100 @@ func (p *SyncQueueProcessor) EnqueueProgress(update *ProgressUpdate) error {
 	}
 }
 
+type HighlightUpdate struct {
+	DeviceID       pgtype.UUID
+	MediaItemID    pgtype.UUID
+	UserID         pgtype.UUID
+	SelectionText  string
+	StartPosition  string
+	EndPosition    string
+	Color          string
+	NoteText       string
+	EpubcfiStart   string
+	EpubcfiEnd     string
+	PercentageStart float64
+	PercentageEnd   float64
+	Source         string
+	DeviceSyncData map[string]interface{}
+}
+
+type NoteUpdate struct {
+	DeviceID     pgtype.UUID
+	MediaItemID  pgtype.UUID
+	UserID       pgtype.UUID
+	Content      string
+	Position     string
+	Source       string
+	DeviceSyncData map[string]interface{}
+}
+
+type BookmarkUpdate struct {
+	DeviceID       pgtype.UUID
+	MediaItemID    pgtype.UUID
+	UserID         pgtype.UUID
+	Title          string
+	Position       string
+	Notes          string
+	Source         string
+	DeviceSyncData map[string]interface{}
+}
+
+func (p *SyncQueueProcessor) EnqueueHighlight(ctx context.Context, update *HighlightUpdate) error {
+	syncData := map[string]interface{}{
+		"selection_text":   update.SelectionText,
+		"start_position":   update.StartPosition,
+		"end_position":     update.EndPosition,
+		"color":            update.Color,
+		"note_text":        update.NoteText,
+		"source":           update.Source,
+		"epubcfi_start":    update.EpubcfiStart,
+		"epubcfi_end":      update.EpubcfiEnd,
+		"percentage_start": update.PercentageStart,
+		"percentage_end":   update.PercentageEnd,
+		"device_sync_data": update.DeviceSyncData,
+	}
+	return p.enqueueAnnotation(ctx, update.DeviceID, update.MediaItemID, SyncTypeHighlight, syncData)
+}
+
+func (p *SyncQueueProcessor) EnqueueNote(ctx context.Context, update *NoteUpdate) error {
+	syncData := map[string]interface{}{
+		"content":          update.Content,
+		"position":         update.Position,
+		"source":           update.Source,
+		"device_sync_data": update.DeviceSyncData,
+	}
+	return p.enqueueAnnotation(ctx, update.DeviceID, update.MediaItemID, SyncTypeNote, syncData)
+}
+
+func (p *SyncQueueProcessor) EnqueueBookmark(ctx context.Context, update *BookmarkUpdate) error {
+	syncData := map[string]interface{}{
+		"title":            update.Title,
+		"position":         update.Position,
+		"notes":            update.Notes,
+		"source":           update.Source,
+		"device_sync_data": update.DeviceSyncData,
+	}
+	return p.enqueueAnnotation(ctx, update.DeviceID, update.MediaItemID, SyncTypeBookmark, syncData)
+}
+
+func (p *SyncQueueProcessor) enqueueAnnotation(ctx context.Context, deviceID, mediaItemID pgtype.UUID, syncType string, syncData map[string]interface{}) error {
+	syncDataJSON, err := json.Marshal(syncData)
+	if err != nil {
+		return fmt.Errorf("marshal sync data: %w", err)
+	}
+
+	_, err = p.db.CreateSyncQueueItem(ctx, database.CreateSyncQueueItemParams{
+		DeviceID:    deviceID,
+		MediaItemID: mediaItemID,
+		SyncType:    syncType,
+		SyncData:    syncDataJSON,
+		Priority:    pgtype.Int4{Int32: int32(PriorityCriticalNote), Valid: true},
+		MaxAttempts: pgtype.Int4{Int32: 3, Valid: true},
+		Status:      pgtype.Text{String: SyncStatusPending, Valid: true},
+	})
+	return err
+}
+
 func (p *SyncQueueProcessor) enqueueProgressUpdate(ctx context.Context, update *ProgressUpdate) {
 	syncData := map[string]interface{}{
 		"percentage": update.Percentage,
@@ -308,6 +407,8 @@ func (p *SyncQueueProcessor) executeSync(ctx context.Context, item SyncQueueItem
 		return p.syncNote(ctx, device.UserID, item.MediaItemID, syncData)
 	case SyncTypeHighlight:
 		return p.syncHighlight(ctx, device.UserID, item.MediaItemID, syncData)
+	case SyncTypeBookmark:
+		return p.syncBookmark(ctx, device.UserID, item.MediaItemID, syncData)
 	default:
 		return fmt.Errorf("unsupported sync type: %s", item.SyncType)
 	}
@@ -407,11 +508,138 @@ func (p *SyncQueueProcessor) syncProgress(ctx context.Context, userID pgtype.UUI
 }
 
 func (p *SyncQueueProcessor) syncNote(ctx context.Context, userID pgtype.UUID, mediaItemID pgtype.UUID, syncData map[string]interface{}) error {
-	return fmt.Errorf("note sync not yet implemented")
+	if p.annotationSvc == nil {
+		return fmt.Errorf("annotation service not available")
+	}
+
+	req := SaveNoteRequest{
+		MediaItemID: mediaItemID,
+		UserID:      userID,
+	}
+
+	if v, ok := syncData["content"].(string); ok {
+		req.Content = v
+	}
+	if v, ok := syncData["position"].(string); ok {
+		req.Position = v
+	}
+	if v, ok := syncData["source"].(string); ok {
+		req.Source = v
+	}
+	if v, ok := syncData["epubcfi_location"].(string); ok {
+		req.EpubcfiLocation = v
+	}
+	if v, ok := syncData["percentage_location"].(float64); ok {
+		req.PercentageLocation = v
+	}
+	if v, ok := syncData["chapter_reference"].(float64); ok {
+		req.ChapterReference = int32(v)
+	}
+	if v, ok := syncData["device_sync_data"].(map[string]interface{}); ok {
+		req.DeviceSyncData, _ = json.Marshal(v)
+	}
+
+	_, err := p.annotationSvc.SaveNote(ctx, req)
+	return err
 }
 
 func (p *SyncQueueProcessor) syncHighlight(ctx context.Context, userID pgtype.UUID, mediaItemID pgtype.UUID, syncData map[string]interface{}) error {
-	return fmt.Errorf("highlight sync not yet implemented")
+	if p.annotationSvc == nil {
+		return fmt.Errorf("annotation service not available")
+	}
+
+	req := SaveHighlightRequest{
+		MediaItemID: mediaItemID,
+		UserID:      userID,
+	}
+
+	if v, ok := syncData["selection_text"].(string); ok {
+		req.SelectionText = v
+	}
+	if v, ok := syncData["start_position"].(string); ok {
+		req.StartPosition = v
+	}
+	if v, ok := syncData["end_position"].(string); ok {
+		req.EndPosition = v
+	}
+	if v, ok := syncData["color"].(string); ok {
+		req.Color = v
+	}
+	if v, ok := syncData["note_text"].(string); ok {
+		req.NoteText = v
+	}
+	if v, ok := syncData["source"].(string); ok {
+		req.Source = v
+	}
+	if v, ok := syncData["epubcfi_start"].(string); ok {
+		req.EpubcfiStart = v
+	}
+	if v, ok := syncData["epubcfi_end"].(string); ok {
+		req.EpubcfiEnd = v
+	}
+	if v, ok := syncData["percentage_start"].(float64); ok {
+		req.PercentageStart = v
+	}
+	if v, ok := syncData["percentage_end"].(float64); ok {
+		req.PercentageEnd = v
+	}
+	if v, ok := syncData["chapter_reference"].(float64); ok {
+		req.ChapterReference = int32(v)
+	}
+	if v, ok := syncData["device_sync_data"].(map[string]interface{}); ok {
+		req.DeviceSyncData, _ = json.Marshal(v)
+	}
+
+	_, err := p.annotationSvc.SaveHighlight(ctx, req)
+	return err
+}
+
+func (p *SyncQueueProcessor) syncBookmark(ctx context.Context, userID pgtype.UUID, mediaItemID pgtype.UUID, syncData map[string]interface{}) error {
+	if p.annotationSvc == nil {
+		return fmt.Errorf("annotation service not available")
+	}
+
+	req := SaveBookmarkRequest{
+		MediaItemID: mediaItemID,
+		UserID:      userID,
+	}
+
+	if v, ok := syncData["title"].(string); ok {
+		req.Title = v
+	}
+	if v, ok := syncData["position"].(string); ok {
+		req.Position = v
+	}
+	if v, ok := syncData["notes"].(string); ok {
+		req.Notes = v
+	}
+	if v, ok := syncData["source"].(string); ok {
+		req.Source = v
+	}
+	if v, ok := syncData["cfi_position"].(string); ok {
+		req.CFIPosition = v
+	}
+	if v, ok := syncData["epubcfi_location"].(string); ok {
+		req.EpubcfiLocation = v
+	}
+	if v, ok := syncData["percentage_loc"].(float64); ok {
+		req.PercentageLoc = v
+	}
+	if v, ok := syncData["page_number"].(float64); ok {
+		req.PageNumber = int32(v)
+	}
+	if v, ok := syncData["chapter_number"].(float64); ok {
+		req.ChapterNumber = int32(v)
+	}
+	if v, ok := syncData["chapter_reference"].(float64); ok {
+		req.ChapterReference = int32(v)
+	}
+	if v, ok := syncData["device_sync_data"].(map[string]interface{}); ok {
+		req.DeviceSyncData, _ = json.Marshal(v)
+	}
+
+	_, err := p.annotationSvc.SaveBookmark(ctx, req)
+	return err
 }
 
 func (p *SyncQueueProcessor) markItemFailed(ctx context.Context, item SyncQueueItem, errMsg string) {