Check your EPUB before sending it to a store.
Choose a book
Choose or drop an EPUB · EPUB 2/3 · max 100 MB · original unchanged
Choose an EPUB file, then run the check.
Check report
Choose repairs
Choose repairs. The original stays untouched.
Review changes
The new file is checked again before it can be downloaded.
Re-check result
Metadata and export
Review metadata edits individually. Keep your original and re-check the corrected EPUB after export.