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CHM to EPUB – Four Steps, No Headaches
Find Your CHM
That old programming manual, software guide, or help file.
Set to EPUB
We default to EPUB. Best for ereaders.
Convert
We unpack the HTML, rebuild as an ebook.
Read Anywhere
Kindle, Kobo, phone, tablet – it just works.
CHM Files Are Stuck in 1997 – Let's Fix That
Remember CHM? Compiled HTML Help. Microsoft cooked it up in the late 90s to replace those old WinHelp files. Every programming language, every software SDK, every piece of enterprise software dumped their documentation into CHM. And it made sense then – you got a single file, it had a table of contents, search worked, it was fine. On Windows XP.
But here we are in 2026. You're on a Mac. Or an iPad. Or maybe you just want to read that Python tutorial on your Kindle Oasis while you're on the train. And that CHM file? Useless. Double-click it on a Mac and it just sits there. Try to open it on your phone? Nothing. It's like finding a floppy disk – you know there's data in there, but you can't get to it.
That's why I made this converter. I had a bunch of old technical manuals – Delphi, Visual Basic 6, some obscure network admin guides – and I wanted them on my Kobo. So I built a tool that crawls through the CHM, finds all those HTML files, pulls out the images, preserves the table of contents, and packs it all into a proper EPUB. Clean reflowable text. Adjustable font size. Working hyperlinks. It's not a hack – it's a real ebook now.
No sign-up. No "create an account to download." No watermark on every page. Just drag your CHM, click convert, and 45 seconds later you've got an EPUB that opens in literally any reading app made in the last fifteen years. I don't keep your files. They hit the server, get converted, get deleted. That's the whole deal.
One limitation: CHM files over 50MB can be tricky. Some of those old MSDN libraries were enormous. If your file's bigger than that, it's probably a whole encyclopedia – might be worth splitting it up. Otherwise, you're good.
CHM to EPUB Questions (The Ones I Actually Get)
Yep. Internal links within the CHM become internal links in the EPUB. If one page referenced another, that link stays clickable. It's one of the harder parts of CHM conversion, but I got it working.
They come with you. All the images embedded in the CHM get extracted and placed correctly in the EPUB. Old screenshots of Windows 98 dialog boxes? Yeah, those stay too.
Sure. Just change the output format to MOBI in settings. Works fine. EPUB is the default because it's more universal, but MOBI works on older Kindles.
Really old CHM files sometimes used weird compression or encoding that modern tools can't read. If it's from the late 90s, it might be using an ancient version of the format. I'd say 95% of CHM files work. The other 5% are museum pieces.