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| Name | CHM | MOBI |
| Full name | CHM - Microsoft Compiled HTML Help | MOBI - Mobipocket |
| File extension | .chm | .mobi, .prc |
| MIME type | application/vnd.ms-htmlhelp | application/x-mobipocket-ebook |
| Developed by | Microsoft | Mobipocket SA |
| Type of format | Document file format | Ebook file format |
| Description | Microsoft Compiled HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Compiled HTML. The format is often used for software documentation. | Mobipocket SA is a French company incorporated in March 2000 that created the .mobi e-book file format and produces the Mobipocket Reader software for mobile phones, personal digital assistants (PDA) and desktop operating systems. |
| Technical details | Help is delivered as a binary file with the .chm extension. It contains a set of HTML files, a hyperlinked table of contents, and an index file. The file format has been reverse-engineered and documentation of it is freely available. CHM files support the following features: data compression, built-in search engine, ability to merge multiple .chm help files, extended character support. | The Mobipocket e-book format is based on the Open eBook standard using XHTML and can include JavaScript and frames. It also supports native SQL queries to be used with embedded databases. The Amazon Kindle's AZW format is basically just the Mobipocket format with a slightly different serial number scheme, and .prc publications can be read directly on the Kindle. The Kindle AZW format also lacks some Mobipocket features such as JavaScript. |
| Associated programs | Sumatra PDF, HTML Help Workshop | Mobipocket Reader |
| Wiki | https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help | https://en.wikipedia.org/wiki/Mobipocket |