Software & Apps File Types What Is a FAX File? How to open, edit, and convert FAX files By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated March 16, 2020 File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More Tweet Share Email A file with the FAX file extension is a Fax file. They're usually in the TIFF format, meaning that they're basically just renamed image files. Some FAX files may instead be a template file created with the Now Contact software. These kinds of files provide a layout for a fax document (an .NWP file) and may include options already loaded for the document, which is useful if you're creating several similarly formatted documents. An SFF Structured Fax file is a format similar to the FAX image file. Unrelated to this FAX file format is also the FaxFile mobile app that lets you fax documents using a phone or tablet. How to Open a FAX File Most image-management programs should be able to open FAX files, like Windows' default photo viewer, the Windows Paint program, XnView, InViewer, GIMP, and Adobe Photoshop. If you have trouble getting a FAX file to open, try changing the .FAX extension to .TIFF or .TIF and then try to open the file. This isn't a trick you can usually do with most files, but since FAX files are almost always just TIFF files masked by a different extension, this workaround is likely to succeed. Some FAX image files might be created with GFI FaxMaker (but they're still just TIF files), in which case you can use that program to open the FAX file. Now Contact Fax Template files are supposed to open with the Now Contact software from Now Software, using the Use Template drop-down menu option. If you have the Now Contact program, you can build new FAX files through the Define > Print Templates > Faxes menu. After naming the template, you can edit its dimensions and layout before it's created. If you find that an application on your PC does try to open the FAX file but it's the wrong application or if you would rather have another installed program open FAX files, see our how-to change the Default Program for a specific file extension guide for making that change in Windows. How to Convert a FAX File There aren't any free file converters that can save a file with the .FAX extension to some other format, but work with TIF/TIFF files. Because your FAX file is almost certainly a simple image file, try renaming it to use the TIF or TIFF file extension. Next, use a free image converter to convert that file to something else like PNG, PDF, or JPG. More Help With FAX Files If you're not looking for anything related to a .FAX file but rather a fax service for sending faxes, see our Free Online Fax Services list.