iPhones and iPads save photos as HEIC to keep them small, but plenty of websites, upload forms, older apps and Windows machines still won't open a .heic file. Compresso fixes both problems at once: it turns your HEIC into a JPG that works everywhere, and compresses it on the way through — so you get a smaller, universally compatible photo without losing visible quality.
The HEIC is decoded right inside your browser. Only the resulting JPG is sent to our server, where a per-pixel quality gate shrinks it as far as it can go without any change you could see. Nothing HEIC ever leaves your device, the JPG is processed in memory and deleted the moment your download is ready — never stored, logged or shared. It works on iPhone, iPad, Mac or any device with a modern browser, with no app to install and no sign-up.
Drop up to 20 HEIC photos at once, watch the result for each, and download them one by one or straight into a folder. Because HEIC is already a space-efficient format, the real win is a clean JPG every site and app accepts — at the smallest size that still looks identical to your original.