Pentax Raw Codec 1.0.0

It registers itself into the Windows Imaging Component (WIC) pipeline, which means once installed, your .PEF files display proper thumbnails in Windows Explorer and open in Windows Photo Viewer without any conversion step.

For Pentax shooters who need to triage a memory card full of shots before editing, that native integration saves real time.

The codec handles only .PEF files - PENTAX's proprietary RAW format. It does not process DNG files or any other manufacturer's RAW container.

Installation is straightforward: run the installer, accept the agreement, and your system immediately recognizes .PEF files at the shell level.

Who Should Still Download This

Pentax RAW Codec was built for Windows Vista and Windows 7. If you are running either of those systems and need lightweight, native .PEF previewing without installing a full image editor, this is the right tool.

It integrates cleanly with Windows Live Photo Gallery on Vista and 7, enabling basic organization and viewing of your PENTAX files at no cost.

If you are on Windows 8 or older and need RAW support across multiple camera brands in a single install, Microsoft Camera Codec Pack covers PEF alongside Canon CR2, Nikon NEF, Sony ARW, and Panasonic RW2.

Windows 10 and Windows 11 Users

This codec does not install correctly on Windows 10 or Windows 11. On modern systems, the right replacement is Raw Image Extension - Microsoft's free WIC extension that adds native support for PEF and DNG from Pentax K-mount cameras alongside 100+ other RAW formats from Canon, Nikon, Sony, Fujifilm, and Panasonic.

Installation takes under a minute from the Microsoft Store, and your .PEF files will immediately show full thumbnails in File Explorer and open in Microsoft Photos without any conversion.

If you prefer a full-featured viewer over the built-in Windows tools, FastStone Image Viewer supports PEF natively with full-screen browsing, EXIF metadata display, and basic RAW adjustments.

IrfanView covers PEF through its plugins pack and adds batch conversion to JPEG, TIFF, or PNG - useful when you need to hand files off to someone without a RAW-capable setup. XnView handles over 500 formats and brings professional-grade batch renaming and organization tools that suit photographers managing large shoot archives.

For photographers working with multiple camera brands, NEF Codec adds the same native Windows shell integration for Nikon .NEF files that Pentax RAW Codec provides for .PEF files.

The same principle applies to Canon RAW Codec for .CR2 files on legacy Windows, though Windows 10/11 users should again use Raw Image Extension for modern Canon support as well.

Converting PEF Files Without Installing Anything

If your only goal is converting a handful of .PEF shots to JPEG or PNG rather than setting up ongoing shell integration, Adobe DNG Converter transforms PEF files into the open DNG standard - compatible with virtually every editing application and archiving tool going forward.

For quick one-off conversions directly in the browser, ConvertICO's RAW to Image converter handles PEF-to-JPEG conversion without installing any software at all - and if you just need to inspect a file before committing to a conversion, the online RAW viewer lets you preview it instantly in any browser.

Supported Cameras

Pentax RAW Codec 1.0.0 covers a wide range of K-mount DSLR bodies from the mid-2000s through the early 2010s, including the K-7, K-5, K-x, K-r, 645D, and related models.

Cameras introduced after 2012 may not be fully supported - for those bodies, Raw Image Extension or ACDSee Free are the more reliable choices, as both receive ongoing updates that track new Pentax and Ricoh firmware releases.