Compress PNG
A PNG never throws anything away, so making one smaller means either packing it tighter or using fewer colours. This does both. Packing tighter changes nothing at all; using fewer colours is where the big savings on screenshots and flat graphics come from.
How to use it
- 1 Add your PNG files.
- 2 Pack it tighter with nothing changed, or allow fewer colours and set how many to keep.
- 3 Check the preview, paying attention to gradients and soft shadows.
- 4 Download the smaller PNGs.
Formats this tool accepts
Each one has a reference page covering what it stores and where it is supported.
Questions about compress png
Is PNG compression lossless?
Plain re-compression is completely lossless and typically saves five to twenty percent. Palette quantisation is not lossless: it maps the image onto a smaller set of colours, which can cut the file by seventy percent or more on flat artwork while being invisible, but shows as banding on photographs and smooth gradients.
Will transparency survive?
Yes. The alpha channel is preserved in both modes. Quantisation reduces the number of distinct alpha levels along with the colours, so a soft drop shadow may develop faint steps at very low palette sizes.
Should I use WebP instead?
For anything going on the web, usually yes. Lossless WebP is normally twenty to thirty percent smaller than an optimised PNG with the same pixels and transparency, and every current browser supports it. Keep PNG when the file has to open in older desktop software.
Are my files uploaded to a server?
No. The whole thing runs inside the browser tab you already have open. Your file is read straight from your own disk, worked on there, and handed back as a download. Nothing is sent anywhere, nothing is stored, and there is no account and no queue.
Is there a file size limit?
There is no server-side limit because there is no server. The practical ceiling is your device memory, since the file and its output both have to fit in the tab. Files up to a few hundred megabytes are usually fine on a desktop machine, while phones and older laptops will struggle sooner. If a large file fails, close other tabs and try again.
Does it work offline?
Yes, once the page has loaded once. The engine is cached by the browser, so you can turn off your connection, reload the page and keep working. That is a useful side effect of doing the processing locally rather than a separate offline mode you have to enable.
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