1. Technology
You can opt-out at any time. Please refer to our privacy policy for contact information.

What is a PEF File?


Question: What is a PEF File?

Did you find a PEF file on your computer and wonder what program should open it? Maybe someone emailed you a PEF file but you're not sure how to use it. Perhaps you tried to open the PEF file but Windows told you that it could not open it.

Before you can open a PEF file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the .PEF file extension refers to.

Answer: A file with the PEF file extension is a Pentax Raw Image file.

Other types of files may also use the PEF file extension. If you know of any additional file formats that use the .PEF extension, please let me know so I can update this information.

How To Open a PEF File

The easiest way to open a PEF file is to double-click on it and let your PC decide which default application should open the file. If no program opens the PEF file then you probably don't have an application installed that can view and/or edit PEF files.

Warning: Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. See my List of Executable File Extensions for a listing of file extensions to avoid and why. Fortunately, PEF files are not usually a concern.

PEF files can be opened with Able RAWerAdobe Photoshop, and probably some other popular photo and graphics tools as well.

If you know anything else useful about PEF files, please let me know so I can update this page.

Tip: Use Notepad or another text editor to open the PEF file. Many files are text-only files meaning no matter the file extension, a text editor may be able to properly display the file's contents. This may or may not be the case with PEF files but it's worth a try.

If you find that an application on your PC does try to open the PEF file but it's the wrong application or if you would rather have another installed program open PEF files, see my How To Change the Default Program for a Specific File Extension guide for making that change in Windows.

How To Convert a PEF File

There are two main ways to attempt to convert a PEF file to another file type:

The first option involving opening the PEF file in its native program is preferable because it's both easier and will probably result in a more accurate file conversion. Of course if you don't have a program that opens PEF files, a third-party file conversion tool (the second option) could be very useful.

Important: You cannot usually change a file extension (like the PEF file extension) to one that your computer recognizes and expect the newly renamed file to be usable. An actual file format conversion using one of the methods described above must take place in most cases.

Still Having Problems Opening or Using a PEF File?

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the PEF file and I'll see what I can do to help.

©2014 About.com. All rights reserved.