Compress a PNG
Reduce PNG file size in your browser. Nothing is uploaded.
What to know
PNG is a lossless format, so there is no quality dial in the way there is for JPG. Re-encoding through the browser can still shrink a file by discarding metadata and using more efficient compression, but the gains are modest.
If you need a genuinely large reduction for a photographic image, converting to WebP or JPG will do far more than compressing the PNG.
Questions
Is anything uploaded to a server?
No. Every tool on this site runs inside your browser using standard web APIs. There is no upload, no account, no logging and no server holding your data afterwards. You can confirm it by opening your browser's developer tools and watching the network tab stay empty while you work.
Why is the saving smaller than I expected?
PNG compression is lossless — pixel data is preserved exactly. Large reductions are only possible by moving to a lossy format such as WebP or JPG.