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Image MIME Reference
HEJ2K

JPEG 2000 Image (HEIF Container)

image/hej2k
VS

JPEG Image

image/jpeg
JPEG

A complete technical comparison of JPEG 2000 Image (HEIF Container) and JPEG Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

JPEG wins on browser support

Feature Support

Feature HEJ2K JPEG
Transparency (Alpha) Yes ✕ No
Animation Support ✕ No ✕ No
Progressive Loading Yes Yes
HDR Support Yes ✕ No
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
JPEG 2000 Image (HEIF Container)
image/hej2k
Extension
.hej2
Container HEIF / ISOBMFF (ISO/IEC 15444-16)
Compression Lossy / Lossless
Algorithm
JPEG 2000HTJ2K
Color Depth 8-bit, 10-bit, 12-bit, 16-bit
Developed by ISO/IEC JTC 1 / ITU-T
Released 2019
Magic Bytes
XX XX XX XX 66 74 79 70 6A 32 6B 69
Full HEJ2K reference →
JPEG Image
image/jpeg
Extension
.jpg.jpeg.jpe.jfif
Container JFIF / Exif
Compression Lossy
Algorithm
DCT (Discrete Cosine Transform)
Color Depth 8-bit
Developed by Joint Photographic Experts Group
Released 1992
Magic Bytes
FF D8 FF
Full JPEG reference →

Browser Support Comparison

Browser HEJ2K JPEG
Chrome Chrome
✕
✓ All
Firefox Firefox
✕
✓ All
Safari Safari
✕
✓ All
Edge Edge
✕
✓ All
IE IE (Legacy)
✕
✓
HEJ2K

HEJ2K Strengths

  • Brings the extensive capabilities of the HEIF container (like EXIF/XMP, thumbnails, and depth maps) to JPEG 2000
  • Supports mathematically lossless compression via wavelet transformation
  • High scalability and progressive decoding out of the box
Limitations
  • Extremely limited software support outside of niche industries
  • Zero native compatibility with web browsers
  • High computational complexity compared to simpler formats like JPEG or PNG
JPEG

JPEG Strengths

  • Universal support — every browser, OS, and application handles JPEG
  • Excellent compression for complex photographs with natural color gradients
  • Rich metadata support: EXIF (GPS, camera settings), ICC color profiles
Limitations
  • No transparency — cannot have a transparent background
  • Lossy compression introduces visible artifacts on sharp edges and text
  • No animation support

When to choose which format

HEJ2K
Use HEJ2K when…
  • Medical Imaging
  • Geospatial Data
  • Scientific Archiving
JPEG
Use JPEG when…
  • Photography
  • Websites
  • Social Media
  • Print

More comparisons

HEJ2K vs ACES → JPEG vs ACES → HEJ2K vs APNG → JPEG vs APNG → HEJ2K vs AVCI → JPEG vs AVCI → HEJ2K vs AVCS → JPEG vs AVCS → HEJ2K vs AVIF → JPEG vs AVIF → All comparisons →
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