compresspng.net — Frequently Asked Questions

Upload it to the compressor on this page and download the result. Choose Lossless if the image must stay pixel-identical, or leave it on Balanced for the best size-to-quality trade-off.

Graphics and screenshots typically drop 60–80%. Lossless mode manages 5–15%. Photographs stored as PNG compress poorly by comparison and should be converted to JPEG.

Yes — the lossless optimiser keeps every pixel and the whole alpha channel. It removes only redundant file data.

Files are processed in an isolated workspace and deleted automatically a short time after your download.

Neither. Every tool on the site is free to use with no account.

Drop the file onto the box above and download the result. If you want to control the trade-off, pick a strength first: Lossless keeps every pixel, Balanced reduces the palette to 128 colours, and Strong goes down to 64.

Yes — choose Lossless. Every pixel and the full alpha channel are preserved exactly; only redundant encoding data is stripped. Expect a smaller saving than the lossy modes, typically 5–15%.

No. Transparency is preserved at every strength, including the lossy ones, because the palette is built with the alpha channel included.

You can upload multiple PNGs at once and they come back together. Very large uploads are capped for everyone's benefit, but ordinary screenshots and graphics are nowhere near the limit.

Yes — free, no watermark, no account, and no email required.

Upload it, choose "Under 100 KB", and download the result. The tool reduces the palette first and only shrinks the dimensions if it has to.

Usually, yes — but a large, detailed image will have to lose pixel dimensions to get there. Screenshots and graphics normally reach 50 KB while still looking fine.

The tool works down a ladder of settings and stops at the first one that fits, so you often land comfortably under the ceiling rather than exactly on it.

You get the smallest result the tool managed instead of an error. For photographic images, converting to JPEG will get far below any PNG target.

Yes. Decode the input and the output and you get identical pixel data, including the alpha channel. Only encoding overhead is removed.

Because it was already well compressed. Lossless optimisation can only remove waste, and some exporters leave very little. For a bigger reduction try the palette-based strengths on the main compressor.

If re-encoding would have produced a larger file, the original is returned instead. A compressor should never hand you something bigger than what you uploaded.

JPEG is lossy, but at the quality used here the difference is invisible at normal viewing sizes. For photographs the size saving is enormous compared with the quality cost.

It is flattened onto a white background, because JPEG cannot store an alpha channel. Keep the file as PNG if transparency matters.

No. JPEG blurs sharp edges and text, which is exactly what a screenshot is made of. Compress those as PNG instead.

Resizing reduces the pixel dimensions. Compression reduces the file size at the same dimensions. Doing both gives the smallest file, which is what this tool does.

Neither — the aspect ratio is kept and nothing is cut off.

Then it is left at its original dimensions and simply compressed.