The image is processed on your device, so it is never sent anywhere.
How compression works here
A quality slider controls the balance between size and fidelity. Higher settings stay close to the original, while lower settings reduce the color palette to squeeze the file harder.
Transparency is preserved throughout, so logos and cut out graphics keep their clean edges.
How to use it
Drop in a PNG, adjust the quality if you want, and watch the size saving update. The preview lets you check that the result still looks right.
When you are happy, download the smaller PNG. You can try a different quality without reloading the page.
Choosing the right setting
Flat graphics and screenshots tolerate a big color reduction with no visible change, so push the slider down and enjoy the savings.
Detailed images with soft gradients need a gentler touch. Nudge the quality up until banding disappears, then stop.
Frequently asked questions
Does it keep transparency?
Yes. The alpha channel is preserved, so transparent backgrounds stay transparent.
Why is my compressed file sometimes larger?
Photographic PNGs with millions of colors can resist compression. For those, a JPG or WebP is usually a better target format.
Is quality loss reversible?
No, compression discards data to save space. Keep the original if you might need full quality later.
How low can I push the quality?
As low as the preview still looks acceptable to you. There is no penalty for experimenting, so find the smallest size you are happy with.