RAF to JXL Converter
Convert RAF to JXL in your browser. The JPEG preview is converted, and it already carries the Film Simulation (Provia, Velvia, Classic Chrome and so on) chosen in camera. No raw development happens here. You get a JPEG XL encoded with libjxl compiled to WebAssembly, lossy at the quality you choose or lossless. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
RAW expected · other image formats also work
How to use RAF to JXL
- 1
Add your RAF files: drop them here, choose them, or paste from the clipboard.
- 2
Set the quality.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .jxl files one at a time or together as a ZIP.
Why use Aback Images for raf to jxl
Where the JXL goes next
JXL opens in Safari 17+, macOS 14 and iOS 17, GIMP, Krita, ImageMagick and the libjxl tools.
JXL next to RAF
The JXL is made from the camera's 8-bit preview, so it is a small fraction of a 20 to 60 MB raw file.
A second JPEG generation
The pixels come from the JPEG preview the camera embedded in the RAF, so they have been compressed once already; keep the quality at or above the default.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
RAF vs JXL
What changes from RAF to JXL
Encoding: the RAF uses uncompressed or lossless compressed sensor data in Fujifilm's own container; JXL uses lossy VarDCT or lossless modular coding; existing JPEGs can be repacked without loss, and the download is a JPEG XL encoded with libjxl compiled to WebAssembly, lossy at the quality you choose or lossless.
Bit depth: 12 to 16 bits per channel depending on the camera in the RAF; JXL allows 8 to 16 bits per channel, or floating point, and the JXL written here has 8 bits per channel. The sensor's 12 to 16 bits are not used: the 8-bit camera preview is converted.
Colour: camera RGB from an X-Trans 6×6 or Bayer 2×2 mosaic in the RAF; JXL supports sRGB, Display P3, linear and other spaces described in the codestream, written here as 8-bit sRGB.
Metadata: the RAF can carry EXIF and Fujifilm maker notes, including the Film Simulation; JXL can carry EXIF and XMP boxes in the container form, often stripped by encoders, but nothing is copied across.
About RAF
RAF is the raw format of Fujifilm cameras, from the X series to the medium-format GFX. Most X-series bodies use an X-Trans sensor with a 6×6 colour filter pattern instead of the usual Bayer 2×2.
RAF is not TIFF at the top level: it opens with the text 'FUJIFILMCCD-RAW', then a header with the camera model and offsets to three blocks: a JPEG preview near the start of the file, a header describing the sensor layout, and the sensor data.
RAF files usually come from Fujifilm X-T, X-H, X-S, X-E, X100 and GFX cameras.
About JXL
JPEG XL is a next-generation format designed to replace JPEG. It compresses better than JPEG and WebP, supports lossless, HDR and progressive decoding, and can losslessly repack existing JPEGs.
A JPEG XL file is either a bare codestream starting with FF 0A or an ISO base media container whose 'jxlc' box holds the codestream. A recompressed JPEG keeps a 'jbrd' box that lets the original JPEG bytes be rebuilt exactly.
When converting RAF to JXL makes sense
JXL is the better choice for archiving and future-proof high quality storage, while RAF suits editing Fujifilm photos in a raw developer.
JXL strengths: Excellent lossy and lossless compression; Progressive decoding and HDR; Huge image sizes. Drawbacks to weigh: Browser support is limited (Safari only by default); Few apps can open it yet.
Limitations
- X-Trans sensor data is never demosaiced here, so none of the artefacts some raw developers produce from it appear.
- Chrome and Firefox do not display JPEG XL by default, so it is not yet a format for websites; it suits archives and apps that support it.
- Lossless JPEG XL is usually smaller than PNG for the same pixels.
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Frequently asked questions
Does converting RAF to JXL lose quality?
JXL is lossy, so detail the eye barely notices is discarded to save space. The RAF's preview is a camera JPEG already, so keep the quality high to avoid stacking artefacts. The sensor's 12 to 16 bits are not used: the 8-bit camera preview is converted.
Which apps open JXL files?
Safari 17+, macOS 14 and iOS 17, GIMP, Krita, ImageMagick and the libjxl tools. It opens in Safari 17 and later; Chrome and Firefox do not display it by default.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.