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Epubcheck Alternatives
Similar projects and alternatives to epubcheck
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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syncabook
📖🎧 A tool for creating ebooks with synchronized text and audio (EPUB3 with Media Overlays)
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epub-optimizer
Advanced EPUB optimizer: minifies HTML/CSS/JS, compresses and downscales images, subsets fonts, optimizes SVGs, and repackages EPUBs for smaller, faster, and standards-compliant e-books.
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syosetu2epub
Python package that takes a link to a Syosetu web novel and converts it to an e-reader friendly EPUB file
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ayerigrammar
Discontinued 2016–18 rewrite of the Ayeri Grammar | Moved to https://codeberg.org/carbeck/ayerigrammar
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NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better epubcheck alternative or higher similarity.
epubcheck discussion
epubcheck reviews and mentions
Posts with mentions or reviews of epubcheck.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2026-04-09.
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Show HN: Rust based eBook library for Python, with MIT license
In terms of conformance, using https://www.w3.org/publishing/epubcheck/
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EPUB Optimizer
Download EPUBCheck from the official website
- EPUBCheck
- EPUBCheck – The official conformance checker for ePub publications
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Learning Ebook Formatting
Others have already mentioned Sigil and Calibre as excellent tools, epubcheck and ACE by DAISY are also useful and open source to verify the files and accessibility.
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bricked my brand new kobo libra 2 three times trying to put my books on it and creating collections
For ePubs, any editing program (e.g. Calibre, Sigil, etc) will have an ePub check feature. You can also use the W3C's standalone ePub check tool: https://www.w3.org/publishing/epubcheck/
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Does your Kobo Libra 2 freeze sometimes?
As others have pointed out, this is often caused by books that are either corrupted or incorrectly formatted in some way or another. If the books that cause the freezes are sideloaded this is a likely culprit, and you can try testing them with EPUBcheck or Calibre. If the books are bought via the Kobo store it's less likely the book itself is the issue.
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Preferred Grammar Medium to Read
I generally write the HTML and XML files by hand and then use epubcheck to verify if I screwed something up and package the individual source files into a single .epub file (which is basically a .zip file).
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Jun 2026
Stats
Basic epubcheck repo stats
8
1,884
6.6
3 months ago
w3c/epubcheck is an open source project licensed under BSD 3-clause "New" or "Revised" License which is an OSI approved license.
The primary programming language of epubcheck is Java.
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