Compress PNG online
Reduce PNG size the way pngquant does: colours are reduced to an optimised palette that looks identical on screen, while transparency stays intact. Everything runs in your browser.
Your files never leave your browser
How to use
- 1
Choose a quality level — High keeps 256 colours and looks identical for most graphics.
- 2
Drop your PNG files into the box or click to choose them.
- 3
Download each compressed PNG or grab them all as a ZIP.
FAQ
Are my images uploaded?
No. Quantization runs in your browser (in a Web Worker), so files never leave your device.
How does it stay a PNG and still get smaller?
PNG is lossless, but a 24-bit image can be converted to an 8-bit palette. With 256 well-chosen colours most graphics look identical and shrink 50–70%.
Is transparency preserved?
Yes, including semi-transparent edges. The alpha channel is part of the palette.
When should I use JPG instead?
For photographs. PNG quantization helps logos, icons, screenshots and flat illustrations most; photos are usually smaller as JPG or WebP.
Why did a file not shrink?
Images that already use a small palette or heavy dithering may not benefit. The tool never returns a larger file than the original.