Compression quality, backed by open data
Every release is automatically benchmarked against best-in-class technology stacks. Reports and sample images are downloadable.
Our first public benchmark report is in the works
The benchmark runs automatically on every release and will be published as soon as it goes live. The report will include side-by-side size distributions for PNG and JPEG, perceptual quality metrics (SSIM, higher is better ↑ / Butteraugli distance, lower is better ↓) and downloadable sample images.
Try it with your own imagesMethodology
Our test set spans five scene types — UI screenshots, illustrations, icons, images with an alpha channel and photographs — with the source and license recorded for each image (our own / CC0 / public benchmark sets). The control group runs best-in-class open-source technology stacks under the same quality constraints, and an item counts as a win only when both metrics (size and perceptual quality) pass.
- Size metric: output bytes under the same quality constraint (smaller is better ↓)
- Perceptual metrics: SSIM (higher is better ↑) and Butteraugli distance (lower is better ↓)
- Sample images show only the licensed subset, each labeled with its source and license