About RAF Files
Fujifilm RAW
RAF is the RAW image format used by Fujifilm cameras, containing unprocessed sensor data with Fujifilm color science.
Family
Raster & Vector Images
Extension
.raf
MIME Type
image/x-fuji-raf
Can Use As
52 41 46 46 00 01 00 00 4B 41 49 4A
ASCII: RAFF....KAIJ
📈 Target Minimum File Size (Guaranteed ≥ KB)
Lossless JPEG Q100 + standard COM segment padding for government & exam portals
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HOW RAF CAME TO BE.
RAF — Raw Fujifilm — shipped in 2003 as the raw format for Fujifilm’s Super CCD sensors. Unlike most competitors, Fuji’s sensors use an unusual pixel arrangement (the X-Trans pattern since 2012, replacing Bayer’s traditional RGGB grid), which makes RAF files harder to demosaic than a typical raw. Adobe Camera Raw spent years improving their X-Trans algorithm; Capture One and Iridient Developer emerged as favored alternatives.
Fujifilm built a cult following among photographers who love the company’s film simulations — digital renderings of classic Fujichrome and Velvia stocks. RAF files carry the recipe of which simulation was applied at capture, but the actual film-curve magic happens inside Fuji’s X Raw Studio software. Getting non-Fuji tools to match the look has been a decade-long cat-and-mouse game.
Technical Specifications
- MIME type
- image/x-fuji-raf
- Extension
- .raf
- Container
- Fujifilm proprietary TIFF-like
- Sensor arrays
- X-Trans (APS-C), Bayer (GFX medium-format)
- Bit depth
- 14-bit (X-series); 16-bit (GFX)
Typical Sizes & Weights
26 MP RAF (X-T4, X-T5)
40-55 MB
40 MP RAF (X-H2, X-T5 40MP)
60-80 MB
102 MP RAF (GFX 100 II)
150-220 MB
STRENGTHS & LIMITATIONS.
Strengths
- Full 14-bit (most bodies) or 16-bit (GFX) sensor data.
- Film simulation recipe stored in metadata.
- X-Trans sensor produces distinctive moiré-free rendering.
- Supports every classic Fuji film-simulation look.
Limitations
- X-Trans demosaicing is the hardest raw problem to solve cleanly.
- Third-party tools rarely match Fuji's own rendering.
- Proprietary with no official spec.
- GFX RAF files are massive (150+ MB per shot).
CURIOSITIES & TRIVIA.
Fuji's X-Trans sensor uses a 6×6 pixel pattern (vs Bayer's 2×2) — harder to demosaic but reduces moiré without a low-pass filter.
Film simulations (Velvia, Astia, Classic Chrome, Acros) are baked as recipes in RAF files — applying them in third-party tools never perfectly matches Fuji's X Raw Studio.
The GFX medium-format bodies also write RAF — same extension, much larger sensor data (102 MP on the GFX 100 II).
RAF files contain an embedded JPEG preview at full resolution, which is what EVF and camera playback actually display.
Fuji photographers famously argue about whether Capture One or Iridient's X-Trans processing looks more natural.
Specialized Utilities for .RAF Files
Compress Image to 20KB
Compress signature scans, stamp images, and ID photos to strictly ≤ 20 KB (20,000 bytes) for strict online exam and government application portals using binary-search JPEG quantization.
Compress Image to 50KB
Compress JPG, PNG, or WebP photos to strictly under 50 KB (50,000 bytes) for passport portals, university admissions, civil service forms, and KYC uploads without changing pixel dimensions.
Compress JPG to 100 KB
Upload a JPG and download a decodable JPG at or below 100,000 bytes. If the limit cannot be reached, no output is offered.
Crop Image & Photo Resizer
Crop and resize JPG, PNG, WEBP, and AVIF images to exact pixel dimensions, social media aspect ratios, or custom print DPI online for free.
Resize Image
Resize images to exact dimensions or scale by percentage. Lock aspect ratio to prevent distortion. Supports all common image formats.
PNG Compressor — Reduce PNG Size Preserving Transparency
Compress PNG images up to 80% while preserving full alpha-channel transparency, or lock exact file size targets (20 KB, 50 KB, 100 KB).
WEBP Compressor — Optimize WebP for Core Web Vitals
Compress WEBP images for ultra-fast page loads and Lighthouse scores with fine-grained quality sliders and exact byte targets.
Favicon Generator — Multi-Resolution .ICO from PNG, SVG or WEBP
Generate a production-ready multi-resolution favicon.ico containing 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 alpha layers from any logo.
EXIF Metadata Remover
Strip hidden GPS coordinates, camera serial numbers, timestamps, and XMP/IPTC metadata from JPG, PNG, WebP, and TIFF photos before sharing online.
Image to Text (OCR)
Extract text from images using optical character recognition. Supports photos of documents, screenshots, receipts, and handwritten notes in 100+ languages.
JPG to Word Converter (OCR)
Convert scanned JPG, PNG, and WEBP images into editable Microsoft Word (DOCX) documents using 12-language optical character recognition (OCR).
CONVERT FROM RAF
Common Use Cases
Fujifilm X-series photography
Related Formats
Popular comparisons
RAF vs JPG
Differences, file size, and when to choose each format.
RAF vs PNG
Differences, file size, and when to choose each format.
RAF vs WEBP
Differences, file size, and when to choose each format.
RAF vs AVIF
Differences, file size, and when to choose each format.
RAF vs GIF
Differences, file size, and when to choose each format.
RAF vs BMP
Differences, file size, and when to choose each format.
Popular RAF conversions
The most-requested destinations when starting from RAF.
Frequently Asked Questions
RAF (Fujifilm RAW) is an image format used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family and designed around a specific trade-off between file size, visual fidelity, and feature support (transparency, colour depth, compression type). Photographers, web designers, and content creators choose RAF when its particular strengths match the publishing target.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open RAF natively. On mobile, iOS Photos and Google Photos display RAF in the gallery when supported by the OS. If the format is rare or new, convert to JPG or PNG first — both are universally readable — using our RAF to JPG or RAF to PNG converter.
Upload the RAF to KaijuConverter and pick a target format (JPG, PNG, WebP, HEIC, TIFF, BMP, SVG, PDF). The conversion runs in the browser via ImageMagick and returns a download in seconds. No account or installation required; both input and output delete automatically within two hours.
It depends on the task. JPG is the smallest file size for photographs; PNG is lossless with transparency; RAF has its own niche that may favour colour depth, animation, or encoding efficiency over one or both of those. For the final web publish, test all three and measure file size plus visible quality on real content.
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