What Is a HEIC File?
HEIC is the format an iPhone saves your photos in. It stores the same picture in roughly half the space of a JPEG — and it's the single most common reason a photo from a relative won't open on your PC.
by Robert Castillo · Published · updated
The short answer
HEIC stands for High Efficiency Image Container. It's a way of packing a photo that came out of the video world: the image inside is compressed with HEVC, the same technology used for 4K video. That's why it manages to store a photo at similar quality to JPEG while taking up around half the room.
Apple switched every iPhone to it in 2017 with iOS 11, which is why your phone is suddenly full of files ending in .heic. Inside Apple's world everything just works. The friction starts the moment a HEIC photo leaves an iPhone.
Why it saves so much space
JPEG was finalised in 1992 and compresses each image on its own, in blocks, with techniques that are now more than thirty years old. HEVC — the compression inside a HEIC — was designed two decades later for streaming video, where every saved byte matters enormously, and it's far cleverer about predicting what a region of an image will look like.
In practice a 4 MB JPEG from a phone camera lands at roughly 2 MB as HEIC, with no visible difference. Multiply that across a few thousand holiday photos and it's the difference between filling your phone and not.
Half the size
Similar quality to JPEG in roughly half the storage, which is why Apple made the switch.
More colour depth
Supports 10-bit colour, so skies and gradients band less than they do in an 8-bit JPEG.
More than one image
A single .heic can hold bursts, Live Photos, depth maps and edits alongside the main picture.
So why won't it open?
The compression inside HEIC is covered by a thicket of patents. Playing or decoding HEVC requires licences, and that has a very visible consequence on Windows: Microsoft still charges for the «HEVC Video Extensions» needed to display these files ($0.99 in the US Microsoft Store when we checked on 15 October 2026), and Windows offers you that paid Store listing rather than simply showing the photo.
Everything downstream inherits the problem. Plenty of websites won't accept a .heic upload, older Android phones can't display one, email clients show a broken icon, and photo software that hasn't licensed the codec silently refuses. The file is fine; the ecosystem around it isn't.
| Where | Does HEIC open? |
|---|---|
| iPhone, iPad, Mac | Yes — it's the native format |
| Windows 11 | Usually, though it may still ask for an extension |
| Windows 10 | Often not, without the paid HEVC extension |
| Android | Recent versions yes, older ones no |
| Websites and email | Frequently rejected on upload |
What to do about it
Convert the photos you need to share
HEIC to JPG is the safest option: it opens on everything, everywhere. Do it here and the photos never leave your device.
Or stop your iPhone making them
Settings → Camera → Formats → «Most Compatible». From then on the camera saves JPEG instead, at the cost of larger files.
Keep the originals if you have room
HEIC keeps more colour information. If you're archiving rather than sharing, there's no reason to throw that away.
There is one thing worth being clear about: converting HEIC to JPG makes the file bigger and slightly worse, because you're moving from a modern compressor to a thirty-year-old one. You do it for compatibility, never for quality.
HEIC, HEIF, HEVC — what's the difference?
These three names get used interchangeably and they aren't the same thing. HEIF is the container format — the box. HEVC is the compression method — how the picture inside is squeezed. HEIC is what you get when you put HEVC-compressed images inside a HEIF box, which is exactly what an iPhone produces.
In everyday use, if a file ends in .heic or .heif, it came from an Apple device and everything on this page applies to it.
How to tell if a photo is HEIC before you open it
The extension is the obvious clue, but Windows hides extensions by default, so most people never see it. Turn them on in File Explorer under View → Show → File name extensions and the .heic becomes visible immediately.
There are two other tells. A folder of iPhone photos showing grey placeholder boxes instead of thumbnails is almost always HEIC — File Explorer cannot decode them, so it cannot draw a preview either. And photos straight from an iPhone are usually named IMG_1234.HEIC, keeping Apple’s numbering, which is a strong hint about where they came from.
If you are unsure, dropping the file into the viewer on this site settles it: if it opens, you will see what it was, and if it does not, it was not an image to begin with.