Online CHM Converter
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What is a CHM file?
CHM (Compiled HTML Help) is a proprietary help file format developed by Microsoft. It consists of compressed HTML documents, images, and navigation tools used to create interactive help systems for software.
CHM files are most commonly found in Windows applications and support features like full-text search, indexing, and hyperlinking. Although it’s an older format, it's still widely supported in technical documentation.
How to open CHM files
CHM files can be opened on Windows with the built-in Microsoft HTML Help Viewer. On other platforms, use CHM viewers like xCHM, KchmViewer, or Calibre.
Use AnyConv to convert CHM files to PDF or HTML if you want to read them on unsupported devices or browsers.
Key facts about CHM
- Full name: Compiled HTML Help File
- Extension: .chm
- MIME type: application/vnd.ms-htmlhelp
- Developed by: Microsoft
- Initial release: 1997
Useful links and resources
Convert from CHM
Quickly turn your CHM files into any format you need
🎯 Did You Know?
CHM was a big leap from printed manuals
When CHM debuted with Windows 98, it replaced bulky printed software manuals with searchable, interactive guides — a major shift that helped set the standard for digital documentation in the 2000s.
— Fact picked by Ethan Brooks
❓ Frequently Asked Questions
Answers to common questions about CHM
- Do I need to install software to convert CHM files?No extra software is required. Just upload your CHM files to AnyConv, we’ll convert them on our servers, and you can download the finished file right away.
- Can I use CHM converter on my phone or tablet?Yes, you can convert CHM files on any device — including phones and tablets. AnyConv works perfectly on mobile.
- Is it safe to convert CHM files with AnyConv?Yes, converting CHM files with AnyConv is secure. All files are automatically deleted after conversion and never shared.
- Can I convert multiple CHM files at once?Yes, our converter supports batch processing. You can upload several CHM files and convert them all at once.