500 KB is less about a hard portal rule and more about good manners and good performance: it's a sensible ceiling for an image you attach to an email so you don't clog someone's inbox, and a solid budget for a web hero or banner image that has to look crisp without dragging down page-load speed. This tool compresses a JPG, PNG, or WebP toward 500 KB locally.

Give it the 500 KB target and it lowers quality, then dimensions only if necessary. Half a megabyte is enough to keep a large, full-width photo looking clean on high-resolution screens while cutting the multi-megabyte bloat that phone cameras produce.

Nothing is uploaded, so you can prep hero images or email photos privately and re-run until the size feels right.