PNG Compress

Lossy PNG compression with transparency kept.

How to compress PNG files

  1. Drop your PNG files on the box above, click it to choose files, or paste an image from the clipboard with Ctrl+V.
  2. Pick the number of colours. 256 is the safe default; lower values give smaller files.
  3. Optionally set a maximum width to scale down oversized screenshots and graphics.
  4. Use Compare to check the result side by side, then download each file or all of them as a ZIP.

Why PNG files get so large

PNG is lossless, so it stores every pixel exactly. That is perfect for sharp edges and text, but a full-colour screenshot can easily weigh several megabytes. Most images do not need millions of colours: a carefully chosen palette of 256 or fewer colours looks the same to the eye and needs a fraction of the space. This technique, called colour quantisation, is what popular PNG optimisers use.

When to use PNG

  • Logos and icons with transparent backgrounds.
  • Screenshots with text, where JPG would add blurry artefacts.
  • Charts, diagrams and UI mock-ups with flat colours.

For photos, a JPG or WebP file is usually five to ten times smaller than even a compressed PNG.

Private, free and unlimited

The compressor runs inside your browser, so there are no upload limits, no daily quotas and no waiting. Your images never leave your device, and the compressed copies carry no hidden metadata. Close the tab and everything is gone.

Frequently asked questions

How does lossy PNG compression work?

A normal PNG can hold millions of colours. Lossy compression picks the best palette of up to 256 colours for your image and maps every pixel to it. Files often shrink by 60 to 80 percent and the result is still a standard PNG.

Is transparency kept?

Yes. The palette includes transparency, so logos, icons and cut-out product photos keep their see-through background, including soft edges.

Which colour setting should I pick?

Start with 256 colours, which usually looks identical to the original. Icons, charts and flat illustrations often stay crisp at 64 or even 32 colours. Choose Lossless when every pixel must stay exactly the same.

Are my images uploaded?

No. The compression runs in your browser. Your files are never sent to a server, so the tool is safe for private designs and client work.

Why is my compressed PNG not much smaller?

Photos with smooth gradients and noise compress poorly as PNG. For photos, JPG or WebP will be far smaller. Try the WebP converter for those images.

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