HEIC vs JPG: A Detailed Comparison
JPEG has dominated digital photography for over 30 years since its introduction in 1992. HEIC, as the challenger, has risen rapidly since becoming the iPhone's default format in 2017. How exactly do these two formats differ?
Compression Efficiency
HEIC uses HEVC (H.265) encoding, a far more advanced compression technology than JPEG's DCT algorithm:
| Test Item | HEIC | JPEG |
|---|---|---|
| Average 12MP photo size | ~1.5 MB | ~3.0 MB |
| Compression ratio at same quality | Baseline | ~2x larger |
| Storage savings | ~50% | — |
According to Apple's WWDC 2017 presentation, HEIC files are approximately half the size of JPEG at the same visual quality. This means a 256 GB iPhone can store twice as many photos.
Image Quality
Beyond smaller files, HEIC also offers quality advantages:
- Color depth — HEIC supports 10-bit (1.07 billion colors); JPEG only supports 8-bit (16.7 million colors)
- HDR — HEIC natively supports HDR content; JPEG does not
- Compression artifacts — HEVC's block artifacts are less visible than JPEG's DCT block artifacts
- Detail retention — HEIC retains more detail at low bitrates
Key Takeaway: HEIC is not only smaller but also offers better quality at the same file size. Support for 10-bit color depth and HDR are features JPEG simply cannot match.
Feature Comparison
| Feature | HEIC | JPEG |
|---|---|---|
| Transparency (Alpha) | Supported | Not supported |
| Multi-image storage | Supported (image sequences) | Not supported |
| Depth maps | Supported | Not supported |
| Live Photo | Supported | Not supported |
| EXIF metadata | Supported | Supported |
| Lossless compression | Supported | Not supported |
| Non-destructive editing | Supported | Not supported |
Compatibility
JPEG's greatest advantage is its universal compatibility:
- JPEG — Supported by all devices, all browsers, all applications
- HEIC — Perfect support on Apple devices; incomplete on Windows/Android/Web
This is why you may need to convert HEIC to JPG in scenarios requiring broad compatibility.
When to Use Which?
Keep HEIC When...
- Staying within the Apple ecosystem (iPhone, iPad, Mac)
- Storage space is a priority
- You need HDR, depth maps, or other advanced features
Convert to JPG When...
- Sharing with Windows or Android users
- Uploading to websites that do not support HEIC
- Using image editing software without HEIC support
- Maximum compatibility is required
Conclusion
HEIC is technically superior to JPEG in every measurable way, but JPEG's 30+ years of accumulated compatibility cannot be replaced overnight. When choosing between them, consider your use case and target audience to make the right decision.
References
- Apple. "WWDC 2017 Session 503: Introducing HEIF and HEVC." Apple Developer, 2017. https://developer.apple.com/videos/play/wwdc2017/503/
- MPEG Group. "HEIF — High Efficiency Image File Format." MPEG, 2015. https://mpeg.chiariglione.org/standards/mpeg-h/image-file-format
- Nokia Technologies. "HEIF Comparison." Nokia HEIF, 2024. https://nokiatech.github.io/heif/comparison.html
- Apple. "Use HEIF or HEVC media on Apple devices." Apple Support, 2024. https://support.apple.com/en-us/102016