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Your mum sent you a photo. It's a .heic file. You're on Windows. You double-click it. Nothing happens. This is the HEIC experience for roughly half the world's computer users. Every iPhone has been shooting HEIC by default since 2017, and Apple quietly converts to JPG when you share — but sometimes the conversion doesn't happen and the raw HEIC arrives.
HEIC uses HEVC compression — the same codec behind 4K video streaming — to produce files roughly half the size of equivalent JPGs without visible quality loss. It also supports features JPG never will: depth maps, live photos, burst sequences, and 10-bit colour. The format is technically excellent. The problem is entirely political. Windows needs a Microsoft Store extension to open it. Most web browsers can't display it. Android support arrived late and remains inconsistent.
On Mac or iPhone, everything just works — Preview, Photos, and every Apple app handles HEIC natively. On Windows, install the free HEIF Image Extensions from the Microsoft Store, or convert to JPG with fwip. If you want your iPhone to stop saving HEIC entirely, go to Settings → Camera → Formats → Most Compatible. Your photos will be bigger, but they'll open everywhere.
* Requires HEIF Image Extensions from Microsoft Store
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