How it works
Compress PNG runs on this page, in browser memory. The file you choose is never sent to a server: it is read through the File API, processed locally and handed back as a download.
In three steps
- Choose a file from your device, or drag it onto the drop area.
- Adjust the options on the right, if the tool has settings.
- Press “Process locally” and download the result.
What it takes and what it returns
This tool accepts PNG and produces PNG. The work is done by Canvas.
Real limits
These limits come from what a browser can do safely, not from a paid plan:
- The longest side of the result is capped at 5600 px.
What it does not do
PNG keeps colours lossless, so the saving comes from lowering the resolution. The file gets smaller, but so do its pixel dimensions.
If the result would be larger than the original, the tool keeps the original and tells you so.
Common questions
Do my files reach a server?
No. Processing happens in browser memory. The network is used only to download the application's libraries, and your file's contents are not part of those requests.
Which formats does Compress PNG accept?
It accepts PNG and produces PNG.
Do I need an account?
No. The tool works without an account and without installing anything during the free pilot.
Does it work on a phone?
Yes, in current browsers. Very large files can exceed the memory a phone has available, in which case the job stops with a clear message.