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| Name | FAX | |
| Full name | PDF - Portable Document Format | Group 3 FAX |
| File extension | .fax | |
| MIME type | application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf | image/g3fax |
| Developed by | Adobe Systems | Unknown |
| Type of format | Document format | Fax Document |
| Description | 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. | This format is used to compress TIFF images when sending them via fax machines. This format helps reduce the data transmission time. Group 3 eliminates redundant data during compression in order to reduce file size. The standard 10:1 compression ratio may be increased to the user's preferences, but it can lead to a significant loss of image quality. |
| Technical details | 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 | Adobe Acrobat, Adobe InDesign, Adobe FrameMaker, Adobe Illustrator, Adobe Photoshop, Google Docs, LibreOffice, Microsoft Office, Foxit Reader, Ghostscript. | Microsoft Windows Photo Viewer, XnView |
| Wiki | https://en.wikipedia.org/wiki/Portable_Document_Format | https://en.wikipedia.org/wiki/Fax#Group |