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| Name | CHM | |
| Full name | CHM - Microsoft Compiled HTML Help | PDF - Portable Document Format |
| File extension | .chm | |
| MIME type | application/vnd.ms-htmlhelp | application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf |
| Developed by | Microsoft | Adobe Systems |
| Type of format | Document file format | Document 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. | The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. |
| 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 PDF combines three technologies: A subset of the PostScript page description programming language, for generating the layout and graphics. A font-embedding/replacement system to allow fonts to travel with the documents. A structured storage system to bundle these elements and any associated content into a single file, with data compression where appropriate. |
| Associated programs | Sumatra PDF, HTML Help Workshop | Adobe Acrobat, Adobe InDesign, Adobe FrameMaker, Adobe Illustrator, Adobe Photoshop, Google Docs, LibreOffice, Microsoft Office, Foxit Reader, Ghostscript. |
| Wiki | https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help | https://en.wikipedia.org/wiki/Portable_Document_Format |