About PEF Files
Pentax RAW
PEF is the RAW image format used by Pentax DSLR cameras, containing full sensor data.
Family
Raster & Vector Images
Extension
.pef
MIME Type
image/x-pentax-pef
Can Use As
50 45 46 46 00 01 00 00 4B 41 49 4A
ASCII: PEFF....KAIJ
📈 Target Minimum File Size (Guaranteed ≥ KB)
Lossless JPEG Q100 + standard COM segment padding for government & exam portals
Tap to choose your file Drop files here or click to browse
Automatic format identification and lossless transcoding across 201+ formats.
Convert to:
Detecting available formats...
Target Max File Size:
Uploading...
Processing your file...
READY!
Download File
Your file is converted & verified! Unlock instant download:
One-time secure payment via Stripe (Apple Pay, Google Pay, Card). Zero recurring subscription.
🛡️ Verification Audit
- ✓
- ✓ sRGB Color Fidelity
- ✓
Continue with this converted file (0s zero re-upload):
Batch Conversion Ready!
Your file is converted & verified! Unlock instant download:
One-time secure payment via Stripe (Apple Pay, Google Pay, Card). Zero recurring subscription.
Need to convert larger files or bigger batches right now?
Unlock up to 1 GB & priority cloud queue with 1-click Stripe checkout (Apple Pay, Google Pay, Card):
HOW PEF CAME TO BE.
PEF — Pentax Electronic Format — is Pentax’s proprietary raw format, debuting in 2003 with the *ist D, Pentax’s first DSLR. Like every other major vendor’s raw format, PEF is a TIFF/EP variant with Pentax’s own makernotes storing sensor data, lens info, and shooting parameters. Pentax has always been the quirky underdog — Ricoh acquired Pentax’s imaging business in 2011, but the PEF format carries on through the K-1 Mark II, K-3 Mark III, and every K-series DSLR.
Pentax is one of the few vendors that also encourages use of Adobe DNG — the K-series cameras can write DNG directly instead of PEF if the user prefers archival openness. That dual-format policy (and Ricoh/Pentax’s open-standards philosophy more broadly) is one reason Pentax DSLRs retain a cult following among photographers who value long-term file portability.
Technical Specifications
- MIME type
- image/x-pentax-pef
- Extension
- .pef
- Container
- TIFF/EP with Pentax MakerNote
- Bit depth
- 12 or 14-bit
- Alternative
- DNG (selectable in-camera on K-series)
Typical Sizes & Weights
24 MP PEF (K-3 Mark III)
30-40 MB
36 MP PEF (K-1 Mark II)
45-60 MB
STRENGTHS & LIMITATIONS.
Strengths
- Full Pentax sensor data with 14-bit or 12-bit depth.
- Rich Pentax makernotes for lens and filter metadata.
- DNG alternative available on body — user choice of archival openness.
- Every major raw processor supports PEF.
Limitations
- Proprietary with no public spec.
- Niche market share — Pentax DSLR sales are a fraction of Canon/Nikon/Sony.
- Lightroom profile coverage trails the Big Three.
- Smaller third-party ecosystem.
CURIOSITIES & TRIVIA.
Pentax cameras can write DNG directly as an alternative to PEF — one of the few mainstream vendors that offers the choice.
Ricoh acquired Pentax's imaging division in 2011, bringing PEF into the Ricoh portfolio alongside their own GR series.
The K-1 Mark II's 36 MP PEF files are among the largest raws in consumer DSLRs — typically 45-60 MB.
Pentax K-series bodies have in-body shake reduction — a feature Pentax pioneered before Sony or Canon had it.
Pentax-Ricoh has kept a working DSLR lineup through the mirrorless transition longer than any other vendor.
Specialized Utilities for .PEF 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 PEF
Common Use Cases
Pentax DSLR photography
Related Formats
Popular comparisons
PEF vs WEBP
Differences, file size, and when to choose each format.
PEF vs AVIF
Differences, file size, and when to choose each format.
PEF vs GIF
Differences, file size, and when to choose each format.
PEF vs BMP
Differences, file size, and when to choose each format.
PEF vs TIFF
Differences, file size, and when to choose each format.
PEF vs ICO
Differences, file size, and when to choose each format.
Popular PEF conversions
The most-requested destinations when starting from PEF.
Frequently Asked Questions
PEF (Pentax 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 PEF when its particular strengths match the publishing target.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open PEF natively. On mobile, iOS Photos and Google Photos display PEF 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 PEF to JPG or PEF to PNG converter.
Upload the PEF 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; PEF 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.
Need to Convert Gigabyte Archives or Mass Folders?
KaijuConverter delivers ultra-fast in-memory conversions for everyday tasks. For multi-gigabyte production workloads without browser bandwidth bottlenecks, explore high-throughput desktop suites.
One-time payment with zero recurring commitment: convert files up to 1 GB, OCR, PDF/A, and .ZIP batches for 24 hours.
Full 7 days of unlimited conversions, up to 2 GB per file, 100% ad-free with zero subscription.
High-throughput enterprise pipeline for files up to 2,048 MB, 50-file batches, ISO PDF/A, and priority processing.
Convert thousands of camera RAW files (CR3, NEF, ARW) to WebP, AVIF, or TIFF in one pass.
GPU-accelerated RAW development with end-to-end 16-bit ICC color profile management.