Compress a PNG online

PNG files get big fast, especially screenshots taken on a high-resolution screen. This tool shrinks PNGs in your browser, with no upload and no account. One thing to know up front: PNG is lossless, so the quality slider does not change a PNG. What makes it smaller is resizing.

Open the image compressor

How to compress a PNG

Add your PNG. The free plan takes up to 5 images per batch.
Type a number in the “Max width/height (px)” box. The longest side is scaled down to that value, proportions are kept, and nothing is cropped or stretched.
Press Compress and compare the before and after sizes.
Still too big? Lower the max size and run it again. Each run starts from your original file, so nothing degrades.
Download the result. Transparency is kept as long as the output stays PNG.

Choosing a size

Pick the size by where the image will be shown. A screenshot that appears 800 px wide in an article does not need to be 3000 px wide at the source. Starting points:

Screenshot in a document or article: 1200–1600 px.
Logo or icon: the largest size you will actually display, often well under 500 px.
Graphic on a web page: no more than about twice its displayed width, which keeps it sharp on high-density screens.

Images are never enlarged, so a max size bigger than the image changes nothing.

Why the quality slider does nothing for PNG

JPG and WebP discard detail the eye is unlikely to miss, and the slider controls how much. PNG keeps every pixel exactly, so there is no quality to trade away. Fewer pixels means a smaller file, and that is the only lever. If you do not resize and the result would come out larger than your original, you get the original back labelled “already optimal” instead of a bigger file.

When PNG is the wrong format

PNG is the right choice for screenshots, text, logos and anything with transparency. A photograph saved as PNG, though, is typically far larger than the same photo as a JPG or WebP, and resizing alone only goes so far. Converting a PNG to JPG or WebP is part of Pro ($9 one-time, no subscription). Choose WebP to keep transparency, or JPG if you do not need it; transparent areas become white in a JPG.

Compress a PNG now