Kobo
Kobo EPUB Checker
Check your EPUB against Kobo's known requirements before uploading to Kobo Writing Life or distributing through an aggregator. The checker reviews cover image, metadata, navigation, font embedding, and file structure against Kobo's EPUB support documentation.
Runs in your browserFreeEPUB
Input formats
EPUB
Output formats
Kobo Readiness Report
Common uses
- Check an EPUB before uploading to Kobo Writing Life
- Verify your EPUB will display correctly on Kobo e-readers
- Check that custom fonts are embedded correctly for Kobo
Limitations
- Not officially endorsed by Kobo. Use Kobo Writing Life's upload preview for final verification.
Your e-book files, handled privately
This tool runs entirely in your browser. Your files are never uploaded to a server. This tool does not remove DRM or bypass copyright protection. Only upload files you own or have permission to process.
Frequently asked questions
Yes. Kobo supports EPUB 3, including EPUB 3 media overlays, fixed-layout, and reflowable books.
Kobo Writing Life accepts files up to 1 GB, but recommends keeping books under 50 MB for best performance.