X3F Converter
Convert files to and from X3F online for free. Fast, secure, and high-quality file conversion with no sign-up or software required.
Maximum file size is 1GB
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What is an X3F file?
The X3F file extension represents a raw image format generated exclusively by Sigma digital cameras utilizing the Foveon X3 direct image sensor. Unlike traditional Bayer filter sensors that interpolate color data, the Foveon X3 captures red, green, and blue light at every pixel location in three vertical layers of silicon. The X3F file contains this uncompressed or losslessly compressed raw sensor data alongside a JPEG preview and proprietary metadata, requiring specific demosaicing algorithms to interpret the vertical color information.
How to open an X3F file
Processing X3F files requires specialized raw conversion software capable of interpreting Foveon sensor data. Sigma's proprietary software, Sigma Photo Pro, provides the most accurate rendering. Third-party support is available in Adobe Lightroom (via Camera Raw) and open-source alternatives like Darktable and RawTherapee. Standard operating system image viewers generally cannot decode the raw X3F stream and will often only display the embedded JPEG thumbnail.
X3F Technical Info
- Full Name
- Sigma X3F Raw Image
- Developed By
- Sigma Corporation
- Initial Release
- 2002
- MIME Type
- image/x-x3f
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