Compress PNG Online — Resize to Shrink, Lossless
Reduce PNG file size by scaling dimensions down, losslessly. Runs in your browser — files never leave your device. No upload — runs 100% in your browser
or click to browse
How to use this tool
- Drop an image onto the box above.
- Move the slider — the output size updates live.
- Click Download when the size looks right.
Why PNG works differently
PNG compression is lossless: it stores every pixel exactly, so there is no quality knob to turn. The only honest way to make a PNG smaller is to store fewer pixels — which is what the slider above does. Halving the dimensions quarters the pixel count, and the file usually shrinks by a similar factor. If you need a much bigger reduction and can accept a tiny bit of quality loss, convert to JPEG or WebP instead with the converter tools on this site. Transparency is preserved at every setting.
Frequently Asked Questions
Are my files uploaded to a server?
No. Everything on this page runs inside your browser using JavaScript and WebAssembly. Your file never leaves your device — you can even disconnect from the internet after the page loads and the tool still works.
Will I lose quality?
No new compression artifacts are added — PNG stays lossless. But fewer pixels means less detail, so do not scale down an image you plan to print at large size.
Does it keep transparency?
Yes. Both tools preserve the alpha channel of PNG/WebP sources. Only the JPEG output of other tools flattens transparency to white.
Is there a size limit?
No hard limit — decoding happens in your browser, so the practical limit is your device memory.