What is HEIC?
HEIC stands for High Efficiency Image Container and is a file format based on the HEIF standard (High Efficiency Image File Format, ISO/IEC 23008-12). Apple introduced HEIC with iOS 11 in 2017 as the default storage format for iPhone cameras and has used it on newer devices ever since.
The key point: HEIC uses the same compression algorithm as H.265/HEVC video — one of the most efficient codecs available. The result: iPhone photos saved as HEIC are typically 50% smaller than comparable JPG files at the same or better quality.
HEIC vs HEIF — what's the difference?
HEIF is the container standard (like ZIP or MP4 for video), while HEIC is the specific file extension for HEIF images with HEVC encoding. Put simply: HEIF is the format, HEIC is the file extension Apple uses. Other devices sometimes use .heif for the same format.
Why is HEIC so efficient?
JPEG was developed in 1992. Compression technology has advanced enormously since then. HEVC/H.265 (the codec behind HEIC) uses:
- Larger transform blocks — up to 64×64 pixels instead of 8×8 in JPEG
- Intra-prediction — better prediction of pixel values based on neighbors
- Improved entropy coding — more efficient data compression at the bit level
- Deeper color depth — up to 10-bit instead of 8-bit in JPEG
The result is a format that produces significantly smaller files than JPEG at the same quality.
More HEIF features
HEIF can do more than just still images:
- Image sequences — multiple images in one file (burst photos)
- Live Photos — a short video clip + still image in one file
- Depth maps — depth information for Portrait mode
- HDR support — extended dynamic range
- Animations — similar to animated GIF
- Alpha channel — transparency like PNG
The compatibility problem
HEIC is technically superior — but software support outside the Apple ecosystem is patchy:
| Platform / software | HEIC support |
|---|---|
| iPhone / iPad (iOS 11+) | ✅ Native |
| Mac (macOS High Sierra+) | ✅ Native (Preview, Photos) |
| Windows 10/11 | ⚠️ With free Microsoft extensions |
| Android | ⚠️ Newer versions partly |
| Chrome, Firefox, Edge | ❌ No native support |
| Safari | ✅ Native |
| Photoshop | ✅ With plugin (CC 2018+) |
| Email clients | ⚠️ Often unsupported |
This gap is exactly why the HEIC question comes up so often — and why there is deliberately no browser-local HEIC converter here: outside Safari, browsers cannot decode HEIC because the underlying HEVC codec is patent-encumbered. Our HEIC conversion guide covers all the working paths instead.
Converting HEIC to JPG — options
The easiest ways:
- iPhone: change the setting — Camera → Formats → "Most Compatible" → iPhone saves directly as JPG
- iPhone: when sharing — the Photos app automatically shares HEIC as JPG when sending to non-Apple recipients (AirDrop excepted)
- Mac: Preview app — open file → Export → JPEG
- Windows: HEIF Extensions — free from the Microsoft Store
- iCloud.com — downloads HEIC as JPG on Windows devices
💡 Recommendation: For most users the simplest option is to switch the iPhone to "Most Compatible" (JPG). Quality loss is minimal, and compatibility with every device and app is guaranteed.
The relative: AVIF as the web counterpart
AVIF (AV1 Image File Format) is also a HEIF container, but uses the open AV1 codec instead of HEVC. AVIF is another 20–30% smaller than WebP and is supported by all modern browsers — for the web it's what HEIC is for the iPhone. The full comparison is in our AVIF format article.
Conclusion
HEIC is an excellent format for iPhone photos — 50% smaller than JPG, better quality, more features. The main problem remains the patchy support outside Apple devices. Until HEIC is universally supported, converting to JPG for good compatibility is often the more practical route.