Try the demo
The demo below runs entirely in your browser: images are compressed in a Web Worker with the WASM codecs and are not sent anywhere. A sample photo is compressed as soon as it opens — drop your own images, try the screenshot and transparent-icon samples, switch modes, and drag the before/after slider.
Upload on this site is simulated
GitHub Pages has no backend, so “Upload” here simulates the presigned URL and the PUT inside your browser. Run pnpm demo locally for the full flow against a mock presigning server, and see Uploading to S3 for a real backend.