Image Resizer and Compressor

No. The file is decoded and redrawn on a canvas inside this tab. Nothing is sent to a server, which is why it also works offline once the page has loaded.

PNG, JPEG, WebP, GIF and BMP go in. WebP, JPEG and PNG come out. WebP usually gives the smallest file at the same visual quality, so it is the default.

It sets the encoder quality for WebP and JPEG, from 10 to 100. PNG is lossless and ignores the setting, so the slider is hidden when PNG is selected.

Re-encoding an already compressed image at a high quality can add bytes, and PNG output from a photo is often larger than the JPEG you started with. The before and after sizes are shown so you can spot it.

Input is capped at 15 MB and output edges at 8000 pixels, because larger canvases start failing on mobile browsers.