How does PNG compression work here?

It shrinks the color palette with the same engine pngquant uses, then repacks the file with oxipng. Fewer colors, smaller files. Lossless keeps every color and just repacks.

Will transparency be kept?

Yes. Your PNG's transparency survives compression.

PNG Compressor

Shrinks PNGs with color quantization for real savings, with a lossless option for when you can't give up a single pixel.

What this does

Shrinks PNG images using color quantization — the same engine pngquant uses — to cut real file size while keeping the output losslessly repacked. A lossless option is available when you need every original pixel preserved.

How it works

1Drop your PNGs or pick them.
2Pick a color count, or keep it lossless.
3Download each one, or grab them all as a zip.

Built with open source

UPNG.js — PNG encoder with lossy compression via color quantization. · MIT

Frequently asked questions

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