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docs: add comprehensive format support documentation

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2026-05-08 00:26:56 +08:00
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### Supported Image Formats
| Format | Read | Write | Notes |
|---|---|---|---|
| JPEG | Yes | Yes | |
| PNG | Yes | Yes | |
| WebP | Yes | Yes | |
| AVIF | Yes | Yes | Encode is CPU-intensive (~5s on 4 cores for a large image) |
| GIF | Yes | Yes | Animated GIF supported |
| TIFF | Yes | Yes | Multi-page supported |
| SVG | Yes | No | Rasterized on input, sanitized for security |
| HEIC | Yes | No | Decoded via heif-dec (~0.4s) |
| HEIF | Yes | No | Very slow decode (~15s) |
| DNG (RAW) | Yes (Linux) | No | Decoded via dcraw, not available on macOS |
| PSD | Yes | No | Decoded via ImageMagick |
| HDR | Yes | No | Tone-mapped on decode |
| TGA | Yes | No | Decoded via ImageMagick |
| ICO | Yes | Yes | Via favicon tool |
| PDF | Yes | Yes | Via pdf-to-image / image-to-pdf tools |
SnapOtter supports **55+ input formats** and **14 output formats**, including RAW files from 20+ camera brands, professional formats (PSD, EPS, OpenEXR, HDR), modern codecs (JPEG XL, AVIF, HEIC, QOI), and scientific/gaming formats (FITS, DDS).
Not supported: BMP (V4/V5 headers), JPEG XL (JXL), EXR (missing decode delegate in Docker image).
See the [complete format list](/guide/supported-formats) for details on every supported format, decoder used, and available quality controls.
### Known Limitations