01
Before you start
The file picker accepts: .png, image/png. The contents and encoding of the file must also be supported; an extension alone does not guarantee compatibility.
The download uses the .png extension. Keep the source until you have checked the result.
02
What to expect
Compare the new size with the original and inspect the result. A smaller file can lose visible or audible detail, and already compressed inputs may not become much smaller.
PNG supports transparency and lossless image compression. Converting a JPG to PNG does not reverse earlier JPEG compression.
03
Limits to keep in mind
PNG stays lossless, so an already optimized file may shrink little or not at all.