Free tool
Check your EPUB before you upload it
Find the structural errors, missing metadata and store-link problems that cause rejections, and see what each one means in plain English.
Runs in your browser. Your book is never uploaded.
Drop your EPUB here, or tap to choose a file
Nothing leaves your device
- File structure
- Chapter markup
- Title, author and language
- Cover and images
- Broken links
- Store links
Reading your book…
Checked
Drop another file, or tap to choose
Will the stores accept this file?
Based on published requirements and common rejection causes. Guidance, not a guarantee.
Libba can rebuild this book cleanly
Import your EPUB into Libba for free. Your chapters and text come across, and Libba builds a brand-new, store-ready file when you export. You may need to add your cover and any images again.
Your file looks good. Keep it that way.
Libba builds clean, store-ready files like this every time, for every book you write.
Did someone else format this book for you? Import it, choose a style you love, adjust it as much as you like, and make every future change yourself, for this book and every one after it. No more paying someone each time you need an update.
Fixed when you export from Libba
Importing, formatting and previewing one book is free. Exporting is $39 a year, or $99 once for life.
- 300+ scene-break ornaments
- Separate exports for each store
- Live device preview
- Import EPUB, Word, Markdown
- Keeps working offline
- Author profiles and pen names
$39/year, or $99 lifetime · Works on Mac, Windows, iPad and phones · EPUBs for Kindle, Apple Books and Kobo
Common questions
Is my book uploaded anywhere?
No. The checker runs entirely in your browser and your EPUB is read on your own device. Nothing is sent to a server, and nothing is stored.
Is this the same as EPUBCheck?
No, and we won't pretend otherwise. This is a fast preflight covering the problems that cause most rejections. EPUBCheck is the official W3C conformance tool and tests far more. Passing this doesn't guarantee a store will accept your file.
Why does my EPUB pass on KDP but fail on Kobo?
Because stores check files differently. Kobo expects a declared language and is stricter about structure. KDP rejects links to competing stores, and other stores can object to Amazon links. Full explanation here.