Open .PEF files online
A .pef file is a Pentax RAW photograph — the format Pentax DSLRs have written since the *ist D in 2003 and still write on today's K-series bodies, one of the longest unbroken RAW lineages in photography. Pentax is also the one maker whose cameras let you opt out: most K-series bodies can be switched in the menu to write plain `.dng` instead.
ZipTool develops .pef files entirely in your browser: LibRaw — the open-source RAW engine behind many desktop converters — compiled to WebAssembly demosaics the sensor data, applies the camera's white balance, and renders an sRGB image you can download as PNG. The engine (~1.1 MB) downloads once from this site's own domain and is cached; your photograph never leaves your device.
What is a `.pef` file?
PEF is a TIFF-style RAW — the same structural family as most makers' formats — carrying Pentax's own tag layout. Two decades of bodies write it: the *ist DSLRs, the K10D/K20D and K-5/K-3 generations, the full-frame K-1 since 2016, and the current K-3 Mark III. Ricoh bought Pentax's camera business in 2011; the cameras and the format stayed Pentax.
The dual-format menu is the unusual part: most K-series bodies offer PEF or DNG, and the camera writes the same sensor data either way. PEF is Pentax's native layout — what Pentax's own utility expects — while DNG is Adobe's open, publicly documented container that virtually every piece of software reads without waiting on camera-specific updates. Both open here, so the choice costs nothing on this page.
Pentax's Pixel Shift Resolution — introduced on the K-3 II in 2015 — also lands as .pef: the sensor shifts by one photosite between four exposures and the camera merges them into a single file with true per-pixel color data instead of interpolated demosaic guesses, with motion correction added on later bodies. Those merged files open here like any other PEF.
- Pentax shooters culling K-series shoots without Digital Camera Utility
- Reviewing Pixel Shift Resolution files at full resolution
- Opening a .pef from an archive or a client on any machine
- Checking both a .pef and its DNG sibling from the same body
How to open a `.pef` online
Open ZipTool in a new tab, then drop your .pef onto the page — or click to browse for it, or paste a URL. The file opens in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview, read entirely on your device.
- Drag your
.pefonto the page — or click to browse, or paste a URL. - It opens immediately in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview. No install, no sign-up.
- Read, search, or copy it. Your file never leaves your browser.
Open `.pef` without uploading
Most "open pef online" sites work by uploading your file to a server and processing it there. ZipTool does the opposite: it loads its parser once, then reads your .pef locally in the browser tab. The contents stay on your device.
You can prove that in seconds. Open the page, press F12 for DevTools, switch to the Network tab, and open your file — no request carrying the file's contents is sent. You can also turn off Wi-Fi after the page loads and the file still opens. See security and privacy for the full picture.
Frequently asked questions
PEF or DNG — which should my Pentax write?
Most K-series bodies let you choose in the menu. The sensor data is the same either way: PEF is Pentax's native layout (and what Pentax's own software expects), while DNG is Adobe's open container that nearly every tool reads without updates. Many photographers keep PEF for the Pentax workflow and switch to DNG when handing files to others. This viewer opens both, so nothing here hinges on the choice.
How do I open a .pef file online?
Drop the .pef on this page — or click to browse, or paste a URL. The developed image appears with its camera model, dimensions, and lens info; the status bar offers a Download .png of the full-resolution render. The first open fetches the LibRaw engine (~1.1 MB) once from this site's own domain; afterwards it is cached.
Which cameras write .pef files?
Pentax interchangeable-lens DSLRs since the *ist D in 2003 — the K10D through K-3 III APS-C generations and the full-frame K-1 line — plus their Pixel Shift output. Ricoh has owned the brand since 2011 and the current bodies still write PEF (or DNG, per the menu). Other brands' RAWs open here too; see the online RAW viewer.
Do Pixel Shift Resolution files open here?
Yes — a Pixel Shift file is a PEF with merged multi-shot data, and it develops like any other. Zooming past 100% is where the extra color resolution shows; the Download .png export is full resolution.
Does viewing my PEF upload the photo?
No. The develop engine is WebAssembly running in the page; your file is read locally and the pixels are rendered in the tab. The only network fetch is the engine itself (~1.1 MB, one time, from ziptool.app — not a third-party CDN), which matters for unreleased or client work. Press F12 → Network and watch: no request carries your photo. The online RAW viewer develops the whole camera-RAW family the same way.