Format
What Is HEIC? Apple's Image Format Explained
HEIC is Apple's default photo format on iPhone and iPad — half the size of JPEG at similar quality, but widely incompatible outside the Apple ecosystem.
What is HEIC?
HEIC (High Efficiency Image Container) is Apple's implementation of the HEIF (High Efficiency Image Format) standard, developed by the Moving Picture Experts Group (MPEG). Apple made HEIC the default photo format on iPhone and iPad starting with iOS 11 in 2017.
The naming can be confusing: HEIF is the standard; HEIC is the specific file extension Apple uses, which stores images encoded with HEVC (H.265). You may encounter both .heic and .heif file extensions — they are functionally the same for still images.
How HEIC compression works
HEIC uses HEVC (H.265) intra-frame encoding to compress image data. HEVC is a video codec that was designed as the successor to H.264, offering significantly better compression at the same quality level. By applying HEVC's intra-frame compression to still images, HEIC achieves roughly 50% smaller file sizes than JPEG at comparable visual quality.
Beyond the compression efficiency, HEIF supports several advanced features:
- HDR: Full support for HDR10 and Dolby Vision color — iPhone's ProRAW and Night mode data can be stored in HEIF
- Wide color gamut: Display P3 color space, which captures more vibrant colors than sRGB
- Live Photos: A short video clip can be embedded alongside the still image in a single HEIC file
- Image sequences: Multiple frames can be stored in one container — used for burst photos and Portrait mode depth data
- Alpha channel: Full transparency support
- 16-bit depth: Higher color precision than standard 8-bit JPEG
File size comparison
The size advantage of HEIC over JPEG is the main reason Apple adopted it. A typical iPhone photo that would be 4–6 MB as JPEG is typically 2–3 MB as HEIC — at visually equivalent quality.
| Format | Typical iPhone photo size | Notes |
|---|---|---|
| JPEG (Most Compatible) | 4–6 MB | Universal compatibility |
| HEIC (High Efficiency) | 2–3 MB | ~50% smaller, limited compat |
| ProRAW (iPhone Pro) | 25–50 MB | Full sensor data, lossless |
Compatibility
HEIC's biggest limitation is compatibility outside the Apple ecosystem. This is the primary reason most people need to convert HEIC files.
| Platform | Native support | Notes |
|---|---|---|
| iOS / iPadOS | Full | Native format |
| macOS | Full (macOS 10.13+) | Photos, Preview, Safari |
| Windows | Requires codec | Install HEVC/HEIF extensions from Microsoft Store |
| Android | Partial | Varies by manufacturer and Android version |
| Chrome browser | No | Cannot display HEIC in-browser |
| Firefox browser | No | Cannot display HEIC in-browser |
| Safari browser | macOS/iOS only | Will display on Apple devices |
| Linux | Requires libheif | Not built-in on most distros |
| Adobe Photoshop | Full (CC 2018+) | Requires Camera Raw plugin update |
When to use HEIC
Keep HEIC when: you are staying entirely within the Apple ecosystem and storage savings matter — particularly on older devices with limited storage.
Convert HEIC to JPEG or PNG when:
- Sharing photos with Windows, Android, or Linux users
- Uploading to web platforms or social media (most recompress anyway)
- Sending photos via email to people outside the Apple ecosystem
- Using photos in web projects or with design tools that don't support HEIC
- Archiving photos for long-term compatibility
HEIC vs other formats
| Format | Compression | Relative size | Browser support | Best use |
|---|---|---|---|---|
| HEIC | Lossy (HEVC) | ~50% of JPEG | Safari only | iPhone/iPad storage |
| JPEG | Lossy (DCT) | 100% | Universal | Universal sharing, print |
| AVIF | Lossy (AV1) | ~50% of JPEG | All modern | Web delivery |
| WebP | Lossy + Lossless | ~65% of JPEG | All modern | Web delivery default |
Frequently asked questions
Why does my iPhone save photos as HEIC instead of JPG?
Apple switched to HEIC as the default camera format in iOS 11 (2017) because HEIC files are roughly 50% smaller than JPEG at comparable quality. This saves storage space on your device. Your iPhone still shoots with the same camera quality — the images are just compressed more efficiently.
How do I open HEIC files on Windows?
Windows 10 and 11 require the HEVC Video Extensions codec from the Microsoft Store (it costs a small fee) or the free HEIF Image Extensions. Once installed, the Photos app and other Windows apps can open HEIC files. Alternatively, convert the HEIC to JPG before transferring to Windows using the tools on this site.
How do I convert HEIC to JPG?
Use the HEIC to JPG converter on this site — upload your HEIC file and download the JPG result. You can also convert on iPhone by going to Settings > Camera > Formats and selecting "Most Compatible" to have the camera save as JPEG instead of HEIC going forward.
Does HEIC support transparency?
Yes, the HEIF standard supports alpha transparency, including 8-bit and 16-bit alpha. In practice, most HEIC photos from iPhones do not include transparency, but iOS does use HEIC with alpha for certain system graphics.
Can I change my iPhone to save JPG instead of HEIC?
Yes. Go to Settings > Camera > Formats and select "Most Compatible." Your iPhone will save photos as JPEG (and videos as H.264 MP4) instead of HEIC/HEVC. This uses more storage but produces files that open anywhere without conversion.