What Is HEIC? The iPhone Photo Format That's Half the Size of JPEG
You moved a photo from your iPhone to a computer — and instead of the usual picture you got a .heic file that won't open. Sound familiar? Let's unpack what this format is, why Apple switched every iPhone to it, and how the same photo can weigh half as much in HEIC as it does in JPEG — with no loss of quality.
What HEIC is in plain English
HEIC (High Efficiency Image Container) is the modern photo format that iPhones and iPads shoot in by default. Its core idea is simple: pack a photo of the same quality as a familiar JPEG into a file that's half the size.
The secret is in how it compresses. JPEG was invented in the early 1990s and has barely changed since. HEIC, on the other hand, borrows technology from the world of modern video: the very algorithm that squeezes 4K films is applied to a single still frame. So at the same file size, HEIC keeps more detail — and at the same quality, it takes up noticeably less space.
In short
HEIC is a "smart JPEG for the smartphone era." Same photo, same sharpness, but roughly half the weight. The only catch is that the file doesn't open everywhere — and that's easily fixed by converting it to JPG.
Why the iPhone shoots in HEIC
The turning point came in the autumn of 2017: with iOS 11 and macOS High Sierra, Apple made HEIC the default capture format. Since then every new iPhone photo is a .heic file — unless you switch the setting by hand.
The reason is purely practical: space. Photos from modern cameras keep getting heavier, while phone storage and iCloud aren't infinite. If each shot takes up half as much, the same phone holds twice as many memories, and backups upload faster and cheaper.
Why doesn't this hammer the battery? Because iPhone chips (starting with the A10 Fusion in the iPhone 7) can encode HEVC video in hardware — at the silicon level. HEIC uses the exact same codec, so compressing a photo is essentially free for the processor and the battery.
How much smaller HEIC is than JPEG
The figure Apple loves to repeat is "half the size," and it's not far off. In practice HEIC comes out 40–60% lighter than JPEG at the same visual quality.
Let's make that concrete: a typical 12-megapixel iPhone photo weighs about 2–3 MB as HEIC versus 4–6 MB as JPEG. A couple of megabytes per shot sounds trivial — but multiply it by the thousands of photos in a camera roll and it adds up to tens of gigabytes.
What HEIC can do that JPEG can't
Saving space is just the tip of the iceberg. HEIC isn't merely a "small JPEG" — it's a full-blown container that can hold far more than a single flat picture.
- More colors. HEIC supports up to 16 bits per channel versus JPEG's 8. In practice that means clean skies and sunsets without "banding" on gradients.
- Live Photos in one file. A Live Photo is a short video plus a key frame. HEIC happily stores both inside a single
.heic, whereas JPEG can only hold a static image. - Bursts and frame bundles. A whole burst sequence or several HDR frames can live inside one file — tidier in the camera roll and lighter on storage.
- Depth map. This is what powers Portrait mode: HEIC stores distance data about the subject so the background can be blurred after the shot is taken.
- Transparency. HEIC supports an alpha channel — something JPEG simply doesn't have.
| Capability | HEIC | JPEG |
|---|---|---|
| File size at equal quality | ~½ of JPEG | Baseline |
| Color depth | Up to 16-bit | 8-bit |
| Transparency (alpha) | Yes | No |
| Multiple images in one file | Yes (bursts, Live Photo) | No |
| Depth map (Portrait) | Yes | No |
| Opens anywhere | Not everywhere | Yes |
HEIC, HEIF and HEVC: who's who
Two similar acronyms orbit HEIC, and they're easy to mix up. Let's sort them out — it'll take a minute.
- HEIF (High Efficiency Image File Format) is the container standard itself (ISO/IEC 23008-12). It describes how to pack images, thumbnails and metadata into a single file. It's the "box."
- HEVC (also known as H.265) is the codec — the compression algorithm. It's what actually squeezes the pixels. It's the "way the box's contents are packed."
- HEIC is a HEIF box whose picture is compressed with the HEVC codec. When Apple says "HEIC," that's exactly the pairing it means.
A simple rule: every HEIC is a HEIF, but not every HEIF is a HEIC (a HEIF container can use other codecs too). If you want to dig deeper into this trio, we have a dedicated breakdown — HEIC, HEIF and HEVC: what's the difference.
An easy way to remember
HEIF is the box, HEVC is how it's packed, HEIC is a specific box packed that way. The file extension on an iPhone is always .heic.
The one big downside: compatibility
HEIC has a single but serious problem: outside the Apple ecosystem it doesn't open everywhere. On an iPhone, iPad or Mac everything is seamless — you don't even notice the format. But send a .heic to someone else's computer or upload it to a website, and the trouble starts.
- Windows. Out of the box, Windows 11 (since 22H2) can display HEIF, but iPhone photos compressed with HEVC often also need a separate HEVC codec from the Microsoft Store. On Windows 10 you usually need both extensions.
- Websites and social media. Most upload forms, older forums and many web services accept only JPEG or PNG. They simply don't understand HEIC.
- Older software. Photo editors and viewers from a few years ago know nothing about HEIC and show a blank.
The good news: on recent Android versions (from Android 10 onward) HEIC already opens without any fuss. But if you need a 100% guarantee that a file will open anywhere, there's only one answer — convert it to JPG.
How to open and convert HEIC
There are several ways to open a .heic, but the universal and fastest one is to convert it to JPG. After that the file opens literally everywhere: in Windows File Explorer, in any messenger, on any website and in any photo editor.
Upload the HEIC
Drag the file from your iPhone into an online converter — nothing to install.
Choose JPG
EXIF, GPS coordinates and colors are preserved, and the frame's orientation comes out right.
Download the result
The finished JPEG opens on any device and in any program.
Open your .heic right now
The free FormatZ converter turns an iPhone photo into a universal JPG in a couple of seconds — right in your browser, with no install and no sign-up. EXIF, GPS and colors stay intact.
Convert HEIC to JPGNeed something other than JPG? We also have converters for HEIC to PNG (when transparency matters), HEIC to WebP (lightweight images for the web) and HEIC to TIFF (for printing). The full list lives on the all formats page. And if you'd rather open HEIC on a PC without converting, read our guide on how to open HEIC on Windows.
