Compress JPEG files to the size you need

JPEG stores images as blocks of frequencies. The quality setting decides how precisely those frequencies are kept. Above quality 85 the extra bytes go into detail no display can reproduce; below about 60 the blocks start to show. Between those numbers is where a compressor should land, and this one searches for the highest quality that fits your size cap.

It also removes EXIF metadata (camera model, GPS location, thumbnails), which can be 20 to 100 KB by itself and is a privacy risk when sharing.

This page uses the size cap: type the KB or MB you need, and the quality is chosen for you. If you prefer to set the quality yourself (for example 80 for every file), switch to the Custom mode on the homepage, choose Keep original pixels and use the quality slider.