OpenAnyFile
Works
Viewing, inspecting and verifying. You get the image (or the embedded full-size preview, for camera RAW) rendered on screen. File details, exact byte size and the detected signature are always shown.
How to open a .pef file
A PEF file is a Pentax Electronic Format, introduced by Pentax / Ricoh in 2003. Below: what is actually inside one, and how to open it without installing special software.
What is a .pef file?
Pentax Electronic Format is an image format developed by Pentax / Ricoh, first appearing in 2003. It is normally produced by Pentax DSLRs.
A TIFF-based raw file. Pentax bodies can be set to write DNG instead, so the same camera produces either extension depending on a menu setting.
| Full name | Pentax Electronic Format |
|---|---|
| File category | Images |
| MIME type | image/x-pentax-pef |
| Magic bytes (file signature) | 49 49 2A 00 |
| Developer | Pentax / Ricoh |
| Introduced | 2003 |
| Usually created by | Pentax DSLRs |
| OpenAnyFile engine | TIFF/RAW decoder |
| Opens without upload | Yes — parsed locally in your browser |
Open a .pef file in your browser
OpenAnyFile routes .pef to its TIFF/RAW decoder, which decodes the image (or the embedded full-size preview, for camera RAW) rendered on screen.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .pef file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the TIFF/RAW decoder.
- Your PEF opens on its own viewer page: the image (or the embedded full-size preview, for camera RAW) rendered on screen.
- Use fullscreen for a closer look, or download the file back out unchanged. Works the same on Windows, macOS, Linux, Android and iOS, because it is just a web page.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about PEF files
Can I open a .pef file without installing special software?
Yes. OpenAnyFile's TIFF/RAW decoder runs in your browser, so you can read a PEF file with nothing installed. You get the image (or the embedded full-size preview, for camera RAW) rendered on screen. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a PEF file?
Look at the first bytes rather than the extension. A genuine PEF begins with 49 49 2A 00. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .pef by mistake is easy to spot.
Is it safe to open a PEF file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .pef file, exactly?
Pentax Electronic Format — an image/x-pentax-pef format created by Pentax / Ricoh since 2003. A TIFF-based raw file. Pentax bodies can be set to write DNG instead, so the same camera produces either extension depending on a menu setting.
Does the same viewer handle formats related to PEF?
Yes — the same engine also opens .arw, .cr2, .dng, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .pef file, it will open too: