Kindle
Kindle EPUB Checker
Before uploading to Amazon KDP, check your EPUB against common Kindle requirements and known compatibility issues. The checker reviews your cover image size and ratio, metadata completeness, table of contents structure, internal links, image sizes, and file size. It produces a Kindle readiness report with actionable fixes.
Input formats
Output formats
Common uses
- Check an EPUB before uploading to Amazon KDP
- Diagnose why a Kindle upload was rejected
- Verify cover image dimensions meet Kindle requirements
- Check that metadata is complete before publishing
Limitations
- This tool is not officially endorsed by Amazon. Use it as a pre-check, not a guarantee of successful KDP upload.
- Kindle's conversion pipeline may still raise issues not caught here.
- AZW3 and KFX output quality depends on Amazon's internal converter.
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
Amazon recommends a cover image of at least 2500 pixels on the longest side, with a 1.6:1 height-to-width ratio (roughly 1600×2560 pixels). The minimum is 1000×625 pixels.
KDP accepts EPUB files up to 650 MB. However, delivery fees increase for large files, so keeping your EPUB under 50 MB is recommended for fixed-layout books and under 20 MB for reflowable ebooks.
No. This tool cannot remove DRM or bypass copyright protection. Only upload files you own or have the right to publish.