heydeer/pngdeer
Smaller images, same picture. Compress PNGs to PNG or WebP with automatic quality. PNG output is 8–12% smaller than TinyPNG at equal quality on the median image. Command line and browser.
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README & documentation
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Smaller PNGs. Same picture. pngdeer is a lossy PNG compressor with no quality slider: for each image it searches palette sizes from 2 to 256 colors, with and without dithering, scores each result with a perceptual metric, and keeps the smallest file that still looks right. At the same quality, the median image comes out 8–12% smaller than with TinyPNG, the best result of any open-source compressor we've measured. Try it in your browser → Nothing is uploaded: images are compressed on your device. [](https://heydeer.ai/open-source/pngdeer) We ran pngdeer, TinyPNG and eight open-source quantizers on 180 PNGs: icons, UI screenshots, illustrations, photos, cut-outs and 3D renders. Every output was scored against its original with SSIMULACRA2, a perceptual metric where 90 means indistinguishable at 1:1. TinyPNG is the yardstick: Each cell gives the held-out set (71 images) / the tuning set (109 images): At TinyPNG's quality, pngdeer's files are 12% smaller on…
Read the full README ↗ · Preview checked 2026-10-28T12:37:55.104Z
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What this repository does
Smaller images, same picture. Compress PNGs to PNG or WebP with automatic quality. PNG output is 8–12% smaller than TinyPNG at equal quality on the median image. Command line and browser.
Repository facts
- Owner
- heydeer
- Primary language
- Rust
- Stars
- 412
- Forks
- 35
- Open issues + pull requests
- 1
- License
- MIT
- Archived
- No
- Default branch
- main
- Created
- 2026-10-25T05:09:24.000Z
- Last push
- 2026-10-31T02:56:22.000Z
Topics and intended use
Owner-supplied topics: cli, color-quantization, image-compression, png, png-compression, rust, tinypng, tinypng-alternative, tinypng-cli, webassembly
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Source and freshness
Source: GitHub. Metadata observed 2026-11-01T12:17:46.653Z. Daily imports are snapshots, not real-time monitoring.
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