HEIC
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Tool guide
Since 2017 iPhones have saved photos as HEIC: at the same quality the file is roughly half the size of JPEG. The trouble starts when the photo is passed on — Windows without a plugin, older editors, print-shop kiosks and document upload forms will not open it. This tool decodes HEIC with the libheif library compiled to JavaScript and re-saves the shot as ordinary JPG, PNG or WebP. The library is fetched only once you actually pick a HEIC file, and the photo itself is never uploaded. See also: do the same for AVIF shots, drop GPS and camera data from the photo, merge the photos into a single PDF.
Because it is HEIC, a format built on the HEVC codec whose licence is not present on every system. Windows 10 and 11 display HEIC only after installing an extension from the store, and many editors and printers cannot do it at all. JPG is understood everywhere, so re-saving once is easier than installing codecs on every device.
A little: HEIC is already lossy and JPG compresses the result again. At 90 percent quality the difference is usually invisible. If the shot is going to print or further editing, use 95 or choose PNG, which is lossless.
That is expected: HEIC is roughly twice as efficient as JPEG at comparable quality, so the file naturally grows when re-saved. If size matters more than compatibility, choose WebP — it is closer to HEIC in efficiency while opening in every modern browser and editor.
No. The extension is only a name; the contents stay HEIC and programs still cannot read it, now with a more confusing error. A real transcode is required: the file is decoded into pixels and re-encoded as JPEG, which is what this tool does.
Usually the file is damaged, or it is not actually HEIC despite the extension. Check that the photo opens on the iPhone itself. As a fallback, the camera setting can be switched to Most Compatible so the phone shoots straight to JPEG.
No. The decoder is loaded onto the page as an ordinary script and runs in your browser, while the photo is read straight from your filesystem. No network request carries the image, as the Network tab of developer tools will show.
Before: IMG_2043.HEIC, 3.1 MB
After: IMG_2043.jpg at 85 percent quality — the form accepts it
Before: photo.heic, which Word refuses to insert
After: photo.jpg — pastes like any ordinary picture
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