HEIC, JPG, PNG, WebP — one file or a hundred. The files never leave your browser, and iPhone HEIC photos are handled right here on your machine.
Drop in one image or a whole folder's worth, pick the format you want, and press Convert. Each finished file appears in the tray below the tool for you to download; nothing downloads on its own. With two or more results you also get a single ZIP option.
Why iPhone photos are HEIC. Since iOS 11, iPhones save photos as HEIC because it stores the same picture in roughly half the space of JPG. The tradeoff is that plenty of Windows apps, web forms, and older software still can't open it — converting to JPG or PNG fixes that.
WebP saved from a web page. Images you right-click and save off a site are often WebP, which some editors and print shops reject. Converting to PNG keeps transparency; converting to JPG makes the smallest file.
Converting won't hit a specific file size. Format changes shift the size as a side effect, not on purpose. If you need a file under a set number of kilobytes, use the Image Compressor.
You don't have to take our word for it. Every browser has a built-in panel that shows everything a page sends or receives over the internet. On a computer (this doesn't work on a phone):