Why iPhones use HEIC and when it bites you
Starting with iOS 11 / iPhone 7, Apple switched the default photo format from JPG to HEIC (High Efficiency Image Coding). HEIC stores the same photographic quality in roughly half the JPG file size, which is why your phone keeps so many photos.
The downside shows up the moment you try to use those photos anywhere outside the Apple ecosystem:
- Windows 10 / 11 can read HEIC only if you install Microsoft's paid HEIF extension.
- Older versions of Photoshop, GIMP, IrfanView and most image viewers don't open them at all.
- Web upload forms — for job applications, government portals, marketplaces — almost universally reject .heic.
- Email and chat apps may strip HEIC attachments or fail to render them inline.
Converting to JPG fixes every one of these.