Compress Images
Lossless, and honest about it

Compress PNG Images Online

PNG is a lossless format, which means it cannot trade quality for size the way JPG can. This page explains exactly what will and will not shrink a PNG — and does it without pretending otherwise.

Free to use. No account required. Images are processed in your browser.

Drag and drop your images here

or click to browse files

JPG PNG WebP GIF SVG

Up to 40 MB per image. Nothing is uploaded.

Why PNG Files Rarely Shrink on Their Own

Most PNGs have already been compressed as far as the format allows.

PNG is a lossless format: the image that comes out is pixel-for-pixel identical to the image that went in. It saves space by storing the same data more cleverly — finding repetition and encoding it in fewer bytes — not by discarding anything.

The catch is that the PNG you already have was most likely produced by a tool that did that work. Re-encoding it rarely finds much more, and sometimes finds less: the browser's encoder is fast and general-purpose, while the one that made your file may have been tuned for exactly this kind of image. A small growth is a normal, honest outcome.

This is why the quality slider is disabled when PNG is selected. A slider that appears to work and then changes nothing would be misleading; a slider that is visibly unavailable, with a line of explanation, is the truthful version.

What Actually Makes a PNG Smaller

  • Reduce the dimensions

    This is the reliable lever. Halving width and height leaves a quarter of the pixels, and the file shrinks accordingly. Use the resize option above and set the largest size the image will actually be displayed at.

  • Convert to WebP

    WebP supports transparency like PNG but compresses far better. For most PNGs on the web this is the single largest saving available. Pick WebP as the output format above.

  • Convert to JPG

    If the image is a photograph and does not need transparency, JPG will be far smaller. Set JPG as the output and use the quality slider. Transparent areas will be filled with white.

  • Keep the original

    If neither resizing nor converting suits you, the original PNG is already close to the smallest it can be losslessly. Keeping it is a legitimate outcome, and this tool will say so rather than inventing a saving.

PNG Compression FAQ

Why is my PNG not getting smaller?

Because PNG is lossless and your file has probably already been compressed as far as the format allows. Without discarding detail there is very little left to remove. Reduce the dimensions or convert to WebP instead — both are shown above.

Does the quality slider affect PNG?

No. PNG has no quality parameter, because nothing is discarded. The slider is disabled when PNG is the output format, rather than pretending to work.

Will converting to WebP lose my transparency?

No. WebP supports an alpha channel, so transparent areas are preserved. Converting to JPG is the case that loses transparency, because the JPG format has no alpha channel at all.

Is PNG better than JPG for screenshots?

Yes. Screenshots contain sharp text and flat colour, which is exactly what JPG handles badly: it produces visible fringing around letters. PNG stores those areas exactly, and it is often the smaller file for that kind of image too.

Preview