Convert PNG
to JPG.

Why a PNG ends up so large

PNG is lossless: it stores every pixel exactly, compressing only by spotting patterns like runs of identical colour. That works beautifully on flat artwork and badly on photographs, where almost every pixel differs from its neighbour, so a full-screen screenshot of a photo-heavy page easily runs to several megabytes. JPG instead discards the detail your eye is least likely to miss, which is why the same picture comes back a fraction of the size.

How much you save depends on the picture

Photographs, renders and anything with gradients or texture shrink the most. Flat graphics barely shrink at all. A logo, a UI mock-up or a screenshot of mostly text is exactly what PNG is good at, so JPG has little left to throw away, and its block-based compression leaves a faint halo around hard edges and small type. For those, converting is the wrong move: use compress PNG instead, which keeps the format and shrinks it by cutting the colour palette, so edges stay crisp and transparency survives.

Transparency is flattened onto white

This is the gotcha that catches everyone. JPG has no alpha channel, so there is nowhere to record "transparent". Anything see-through in your PNG has to be painted onto a solid background, and Squish uses white. A logo cut out on a transparent background comes back sitting on a white rectangle: invisible on a white page, obviously wrong anywhere else. Soft edges and drop shadows get the same treatment. Squish flags it rather than letting you find out later - the card for that image reads Transparency flattened onto white (JPG has no alpha). If you see that and you needed the transparency, stay on PNG.

Common questions

Can I get it under an email or upload limit?

Yes. Target size is on by default - set your limit and Squish binary-searches the quality setting image by image until each one lands underneath it. The 100KB target page explains the search. Prefer to steer it yourself? Use the quality slider, and set a max width or height to cut the pixel count too.

Can I convert the JPG back to PNG later?

You can, but it will not undo anything. Re-encoding cannot recover detail that JPG already discarded, so you get the compression artefacts baked in and a much larger file than the JPG. Keep the original PNG if you might need it again.

Can I convert a batch at once?

Drop as many as you like. Several convert at a time as they land, and Download all returns the batch as a zip. Any image can be overridden individually, and the compare slider shows before against after.

What happens to metadata and my files?

EXIF orientation is applied so nothing arrives sideways, and metadata, including GPS, is stripped from the output. Images are processed in memory and never stored - nothing is retained once the converted file comes back. No signup, no watermark.