Picking the target format and its quality
This page changes the file type; it does not resize or crop. You choose PNG, JPEG or WebP, and for lossy targets a quality value.
The image is decoded at its full pixel size, drawn on a canvas and saved in the chosen format. PNG is lossless and has no quality control. JPEG and WebP are lossy and use the slider, which runs from 10% to 100% and starts at 92%. AVIF is offered only when your browser can encode it. Quality is a secondary setting here: the main choice is the format. If shrinking the file is your main aim, Image Compressor is the better page.