diff --git a/internal/handlers/koreader.go b/internal/handlers/koreader.go
index 438df42..e7b3461 100644
--- a/internal/handlers/koreader.go
+++ b/internal/handlers/koreader.go
@@ -457,6 +457,14 @@ func (h *KOReaderHandler) updateProgressForBook(c *echo.Context, deviceID pgtype
 			mediaItem, err := h.db.GetMediaItem(ctx, mediaItemID)
 			if err != nil {
 				log.Printf("Bookhoard: CRE→CFI failed to get media item: %v", err)
+			} else if mediaItem.FormatGroup == string(wsync.FormatGroupFixedLayout) ||
+				mediaItem.FormatGroup == string(wsync.FormatGroupComicArchive) {
+				// Image-based fixed content (fixed-layout comic EPUBs, PDF,
+				// comic archives) has no extractable text, so CRE→CFI conversion
+				// cannot succeed. The page index (page/total_pages) is the
+				// canonical locator. Keep the incoming xpointer for device-native
+				// restore; the web reader restores by page.
+				log.Printf("Bookhoard: CRE→CFI skipped for %s format", mediaItem.FormatGroup)
 			} else if h.libraryService == nil {
 				log.Printf("Bookhoard: CRE→CFI libraryService is nil, skipping conversion")
 			} else {