Software & Apps File Types What Is a PEF File? How to open, edit, and convert PEF 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 January 30, 2020 PEF files. File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More Tweet Share Email A file with the PEF file extension is a Pentax Raw Image file that stands for Pentax Electronic File. It's an uncompressed and unedited photo taken with a Pentax digital camera. The image is yet to be processed in any way — it represents all the raw data taken in by the camera. Other PEF Files Other PEF files may instead be Portable Embosser Format files; they're sometimes called PEF Braille Book files. Those types of PEF files use the XML format to represent physical braille books. Pentax Raw Image files are sometimes in the PTX format. Both PEF and PTX files are similar to other image file formats that digital cameras use to store unmodified data, like Nikon's NEF, Canon's CR2 and CRW, Sony's ARW and SRF, Panasonic's RW2, and Olympus' ORF. How to Open a PEF File PEF files from a Pentax camera open with the software that comes with the digital camera, as well as with Able RAWer, UFRaw, Windows Live Photo Gallery, Adobe Photoshop, Adobe Photoshop Elements, and probably some other popular photo and graphics tools. If you can't open the PEF file in Windows using Windows Live Photo Gallery, you might need to install the Microsoft Camera Codec Pack. Braille Utils open PEF Braille Book files. These files open on an iOS device (iPhone, iPad, iPod touch) too, using the PEF Viewer app. See this list of software at pef-format.org for some other programs that use PEF files. However, some of those programs may only create braille files but not actually be able to open them. If your file isn't opening using the suggestions from above, it's possible you're misreading the file extension. Even though their file extensions look similar, PEF files have nothing to do with PDF, PEM, or PEG (Peggle Replay) files. So, if you're dealing with one of those files instead, you'll most likely have to use different software to open it. How to Convert a PEF File Some free image converter tools convert PEF files to a different image format. Zamzar is one example — it's an online PEF converter, which means that you have to first upload the PEF file to Zamzar and then choose an output format to convert it to, and then download that converted file back to your computer before you can use it. Zamzar converts PEF to JPG, PNG, BMP, PDF, TIFF, TGA, and other similar formats. Adobe DNG Converter converts the PEF file to DNG on Windows and macOS.