Compress EPUB files, save storage space, and optimize your ebook library in seconds. 100% on-device. No cloud, no accounts, no waiting.
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Maker
📌
Hey Product Hunt 👋
I built EPUB Compressor after running into a simple problem myself: image-heavy EPUBs (manga, comics, textbooks, illustrated books) can get huge fast, and most “compression” tools either destroy quality or require uploading private books to a server.
So I made a native iOS app that compresses EPUBs entirely on-device — no uploads, no waiting for cloud processing, and no privacy concerns. The goal was simple: reduce file size as much as possible while keeping visual quality nearly identical for actual reading.
A few things that matter to me with this app:
Fully offline processing
Optimized for large image-heavy EPUBs
Fast compression directly on-device
Keeps EPUB structure intact
Useful for Kobo, Kindle sideloading, backups, and saving storage space
One of my recent tests reduced a 608MB comic EPUB to 194MB with minimal visible quality loss.
I’m a solo developer, so I’d genuinely love feedback — especially from people who read manga/comics or manage large ebook libraries.
Happy to answer any questions about how it works, compression tradeoffs, EPUB handling, or the development process. Thanks for checking it out 🙏
Replies
Hey Product Hunt 👋
I built EPUB Compressor after running into a simple problem myself: image-heavy EPUBs (manga, comics, textbooks, illustrated books) can get huge fast, and most “compression” tools either destroy quality or require uploading private books to a server.
So I made a native iOS app that compresses EPUBs entirely on-device — no uploads, no waiting for cloud processing, and no privacy concerns. The goal was simple: reduce file size as much as possible while keeping visual quality nearly identical for actual reading.
A few things that matter to me with this app:
Fully offline processing
Optimized for large image-heavy EPUBs
Fast compression directly on-device
Keeps EPUB structure intact
Useful for Kobo, Kindle sideloading, backups, and saving storage space
One of my recent tests reduced a 608MB comic EPUB to 194MB with minimal visible quality loss.
I’m a solo developer, so I’d genuinely love feedback — especially from people who read manga/comics or manage large ebook libraries.
Happy to answer any questions about how it works, compression tradeoffs, EPUB handling, or the development process. Thanks for checking it out 🙏