AVIF packs a photo into a tiny file, but plenty of apps still choke on it. Windows Photo Viewer stumbles, older phones can't preview it, a lot of email clients refuse it, and the coworker just writes back 'this won't open.' Converting AVIF to JPG ends that. A JPG opens on basically everything, from a fifteen-year-old laptop to a print shop's upload form. The tool at the top of this page does it right in your browser - drop an AVIF, pick a JPG quality, download a file anything can read. Your image is never uploaded.