What is the RAF file format?
.raf file format is used by digital cameras made by Fujifilm. They contain raw image data - clean, unprocessed and lossless image data captured directly from CCD or CMOS matrices, including Fujifilm's X-Trans sensor, which uses a non-Bayer colour filter array. A .raf file can also contain an embedded JPEG preview image.
Each .raf file begins with the ASCII identifier FUJIFILMCCD-RAW at byte offset 0. It also contains EXIF information about the stored image, enabling the file to be opened and edited with third-party applications or software - such as darktable, RawTherapee, or Adobe Lightroom (Camera Raw). Some photographers convert .raf files to DNG for broader compatibility.
Security & safety
RISK: LOWRAF is a passive image data file - sensor data plus metadata, no executable code - so opening one is safe. The practical cautions are non-malware: RAF is large and proprietary, so keep originals backed up and consider archiving to open DNG for longevity; and remember EXIF metadata (camera, sometimes GPS, timestamps) travels with the file - strip it before publishing if privacy matters. Raw editing is non-destructive, so the original RAF is preserved.
Format details
in a nutshellFULL NAMEFujifilm RAW Image (RAF)
DEVELOPERFujifilmsince Fujifilm digital cameras, early 2000s; current on Fujifilm X-series and GFX
CATEGORYCamera Raw Files
MIME TYPEimage/x-fuji-raf
TYPEProprietary camera raw image (binary; embeds TIFF/EXIF + JPEG preview)
MAGIC BYTES · FILE SIGNATURE
OFFSET
0001020304050607
HEX
46554A4946494C4D
ASCII
FUJIFILM
A RAF file begins with the ASCII string "FUJIFILMCCD-RAW" (followed by a format version such as "0201") at offset 0 - a reliable, unique signature. Internally it then contains an embedded JPEG preview and TIFF/EXIF metadata blocks plus the proprietary raw sensor data. Fujifilm's X-Trans sensors use a non-Bayer colour filter array, which is why raw software needs Fuji-specific demosaicing to decode RAF well.
Programs that open RAF files
Windows6 apps
darktable
Open-source Free Lightroom-style developer; import the RAF to edit non-destructively and export. 
RawTherapee
Open-source Free raw processor with strong X-Trans demosaicing; open the RAF, develop, and export JPG/TIFF. 
Raw Image Extension (Microsoft Store)
Free Install from the Microsoft Store to show RAF thumbnails/previews in File Explorer and the Photos app.
Fujifilm X RAW STUDIO
Free Fujifilm's free app: connect the camera by USB and process RAF using the camera's own film-simulation engine.
Adobe Lightroom / Photoshop (Camera Raw)
Paid Import the RAF; Camera Raw develops it with good Fuji profiles. Industry standard but subscription-based. 
XnView MP
Free Free viewer/converter; displays RAF (via its embedded preview/raw decode) and batch-converts to JPG. 
macOS3 apps
RawTherapee
Open-source Free; open the RAF for fine-grained X-Trans-aware development, export JPG/TIFF.
Apple Photos / Preview
Built-in macOS has built-in Fujifilm raw support; double-click to preview or import into Photos to view/edit RAF. 
Linux3 apps
GIMP (+ darktable/RawTherapee plugin)
Open-source GIMP opens RAF via its darktable/RawTherapee raw loader, then edits as a normal image. Technical details
deep spec| Developer | Fujifilm |
| Format type | Proprietary binary camera raw image |
| MIME type | image/x-fuji-raf |
| File signature | ASCII string "FUJIFILMCCD-RAW" at byte offset 0 |
| Internal structure | Three sections: embedded JPEG preview, TIFF/EXIF metadata block, proprietary raw sensor data |
| Colour filter array | X-Trans (non-Bayer 6×6 RGB pattern) on X-series and GFX models; Bayer CFA on legacy FinePix cameras |
| Raw bit depth | 14-bit per channel (sensor output) |
| Compression | Uncompressed or lossless; varies by camera model |
| Embedded preview | JPEG thumbnail or full-resolution JPEG preview embedded within the file |
| Metadata standard | EXIF (Exchangeable Image File Format) embedded in a TIFF-structured metadata block |
| Demosaicing | Requires Fuji-specific X-Trans demosaicing; standard Bayer algorithms produce colour artefacts on X-Trans files |
| Compatible camera lines | Fujifilm X-series mirrorless, GFX medium-format, legacy FinePix models |
| Output colour space | Camera-native in raw form; converted to ProPhoto RGB or sRGB by post-processing software |
| DNG conversion | Widely converted to DNG via Adobe DNG Converter or in-app export for archiving and broader compatibility |
| Released | Fujifilm digital cameras, early 2000s; current on Fujifilm X-series and GFX |
| Specification | www.fujifilm.com |
RAF conversions
Possible
.RAF .JPGGUIDE
Yes - open the RAF in RawTherapee, darktable, XnView MP, or Fujifilm X RAW STUDIO, then export as JPEG.
How to convert
.RAF .TIFFGUIDE
Yes - open the RAF in RawTherapee, darktable, or Adobe Photoshop, then export as TIFF; the fastest free…
How to convert
.RAF .PNGGUIDE
Yes - open the RAF in RawTherapee or darktable (both free), develop it, and export as PNG.
How to convert
.RAF .PSDGUIDE
Yes - open the RAF in Photoshop via Camera Raw, then save as PSD.
How to convert
.RAF .DNGGUIDE
Yes, you can convert RAF to DNG - the fastest free way is Adobe DNG Converter, a standalone tool that runs on…
How to convert
Community Q&A
asked by usersNo questions yet - be the first to ask about RAF files.
Frequently asked questions
How do I open a RAF file on Windows?
Install the free Raw Image Extension from the Microsoft Store to see RAF thumbnails and previews in File Explorer and Photos. To edit, use the free RawTherapee or darktable, or Fujifilm's free X RAW STUDIO.
What program opens RAF files for free?
RawTherapee and darktable (free, open source) open and develop RAF with good Fuji X-Trans support; XnView MP views and batch-converts; Fujifilm X RAW STUDIO is free. On Mac, Photos/Preview support Fuji raw natively.
How do I convert a RAF to JPG?
Open the RAF in RawTherapee, darktable, XnView or X RAW STUDIO, adjust as needed, and Export/Save As JPEG. These tools also batch-convert whole folders of RAF to JPG.
Why can't I see my RAF photos in Windows?
Windows doesn't decode Fujifilm raw out of the box. Install the free Raw Image Extension from the Microsoft Store and the thumbnails/previews appear in Explorer and Photos.
Why does my Fuji RAF look smeared or 'wormy'?
Fujifilm X-Trans sensors use a non-Bayer colour array that needs X-Trans-aware demosaicing. Use up-to-date software (RawTherapee, darktable, Lightroom, Capture One); older or generic converters can render Fuji detail poorly.
Should I convert my RAF files to DNG?
DNG is an open, well-documented raw format good for long-term archiving and broad app support. Converting (with the free Adobe DNG Converter) is optional - many photographers keep the original RAF as the master and use DNG for archiving.
Is RAF better than JPEG?
For editing, yes - RAF keeps the full unprocessed sensor data, giving far more latitude to recover highlights/shadows and adjust white balance. JPEG is smaller and ready to share but already processed. Shoot raw, then export JPEG.
References
1Microsoft Store - Raw Image Extensionapps.microsoft.com
2RawTherapee - open-source raw processorwww.rawtherapee.com
