1Drop your PNG images into the box above, or pick them from your device — there is nothing to install and no account to create.
2Choose how hard to squeeze: a quality or bitrate target, and optionally smaller dimensions if size matters more to you than detail.
3Start the job and let the workers re-pack the file; your original is never modified in place.
4Compare the new size against the original, then download the compressed PNG file.
Compress PNG FAQ
How does Compress PNG actually make the file smaller?
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Concretely, every pixel stays bit-exact and the saving is won from a stronger DEFLATE or LZW pass plus palette reduction where the image genuinely has few colours, so a screenshot or a piece of line art shrinks far more than a photograph does. Nothing about it depends on you installing software: the job runs server-side and hands back a finished file.
How much smaller will my file get?
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That is decided by the content, not by the tool. Photographic detail, film grain and sensor noise resist compression; flat colour, large uniform areas, line art and text collapse. Expect a dramatic reduction on a screenshot or a logo and a modest one on a busy photograph.
Does the format of my file change how much I can save?
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Very much so. PNG is lossless DEFLATE with a full 8-bit alpha channel and optional 16-bit depth, so it never degrades on re-save but gets large on photographic content. That determines both the headroom available and whether the saving costs you anything in fidelity.
Is there anything specific to PNG I should know before compressing?
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Yes — there is no quality slider to get wrong — a PNG round-trips bit-exactly, so the only thing edits cost you is file size. It is worth knowing before you overwrite an original you might need again.
What is the most common mistake when compressing PNG images?
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Compressing the same file repeatedly. Each pass on a lossy format is a fresh generation of loss and the savings shrink while the damage accumulates. Go from the original to your target in one step, and keep the original.
What do I get back, and can I control the trade-off?
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A single compressed file per input, at a quality level you choose rather than a fixed default. If the result is still not small enough, reducing the pixel dimensions will do more for it than pushing the quality slider further down.
What can I upload to Compress PNG?
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PNG, BMP and TIFF are the lossless raster formats this handles directly, and lossy sources (JPG, WebP, GIF) work too if you want them in the same batch. Multi-page TIFFs are detected and handled page by page.
Is there a file size limit on Compress PNG?
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Yes: free accounts process images up to 5 MB each; lossless sources hit that ceiling sooner than photographs do, because nothing has been thrown away yet. If you are over it, converting to PNG first is often enough on its own — a BMP is routinely ten to twenty times the size of the identical image as PNG.
Will Compress PNG lower the quality of my PNG images?
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No. A lossless source round-trips bit-exactly, so unless you explicitly ask for a lossy output format the pixels that come back are the pixels that went in. That is the whole reason to keep working in this family while you are still editing.
Can I run Compress PNG on several PNG images at once?
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Yes — upload the set and they process in parallel under one set of settings. Lossless files are larger, so a big batch is bound by your upload speed rather than by the processing itself.
Does the alpha channel survive?
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Yes. PNG and TIFF carry a full 8-bit alpha channel and it is preserved end to end. It is only flattened if you deliberately target a format that has no alpha, in which case transparent pixels are composited onto white.
Does Compress PNG cost anything?
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No. Compress PNG runs free without an account and adds no watermark. Files are removed from the workers shortly after you download, and nothing about the image is retained.
