Free webp to jpg
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Image MIME Reference
HEIC

High Efficiency Image Container

image/heic
VS

JPEG XL

image/jxl
JXL

A complete technical comparison of High Efficiency Image Container and JPEG XL — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

JXL wins on browser support

Feature Support

Feature HEIC JXL
Transparency (Alpha) Yes Yes
Animation Support Yes Yes
Progressive Loading ✕ No Yes
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
High Efficiency Image Container
image/heic
Extension
.heic
Container HEIF / ISOBMFF
Compression Lossy / Lossless
Algorithm
HEVC (H.265)
Color Depth 8-bit, 10-bit, 12-bit, 16-bit
Developed by MPEG (Standard) / Apple (Adoption)
Released 2017
Magic Bytes
XX XX XX XX 66 74 79 70 68 65 69 63
Full HEIC reference →
JPEG XL
image/jxl
Extension
.jxl
Container ISOBMFF / JPEG XL Codestream
Compression Lossy (VarDCT) / Lossless (Modular)
Algorithm
VarDCT (Variable block-size DCT)Modular (Predictive coding for lossless)
Color Depth 8-bit, 10-bit, 12-bit, 16-bit, 32-bit (Float)
Developed by Joint Photographic Experts Group (JPEG)
Released 2021
Magic Bytes
FF 0A (Codestream) / 00 00 00 0C 4A 58 4C 20 0D 0A 87 0A (Container)
Full JXL reference →

Browser Support Comparison

Browser HEIC JXL
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✓ 11+
✓ 17+
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
HEIC

HEIC Strengths

  • Exceptional compression efficiency — stores images at roughly half the file size of JPEG with equal or better visual quality
  • Natively supports modern photography features like depth maps, 16-bit color, HDR, and alpha channel transparency
  • Can store image bursts, focal stacks, and animations (Live Photos) within a single file
Limitations
  • Heavily encumbered by software patents, leading to very poor adoption outside the Apple ecosystem
  • Not supported by standard web browsers (except Safari), requiring server-side or client-side conversion for web delivery
  • Windows requires downloading a separate (often paid) extension from the Microsoft Store to view natively
JXL

JXL Strengths

  • Capable of losslessly recompressing legacy JPEG files, saving ~20% space while retaining perfect byte-for-byte restorability
  • Highly superior progressive decoding (Saliency-driven), allowing recognizable images to load extremely fast on slow connections
  • Outperforms WebP and competes favorably with AVIF, especially at high-fidelity settings and for complex textures/photography
  • Royalty-free with an open-source reference implementation (libjxl)
Limitations
  • Google's removal of JXL support from Chrome severely hindered its adoption as a universal web standard
  • Lack of hardware decoding chips compared to video-derived codecs like AVIF (AV1)
  • File parsing logic is complex due to the split between raw codestreams and ISOBMFF containers

When to choose which format

HEIC
Use HEIC when…
  • iOS / iPhone Photography
  • macOS Ecosystem
  • High-Quality Image Archiving
JXL
Use JXL when…
  • High-End Web Delivery (via Safari/Polyfills)
  • HDR Photography
  • Legacy JPEG Archiving
  • Digital Art & Image Storage

More comparisons

HEIC vs ACES → JXL vs ACES → HEIC vs APNG → JXL vs APNG → HEIC vs AVCI → JXL vs AVCI → HEIC vs AVCS → JXL vs AVCS → HEIC vs AVIF → JXL vs AVIF → All comparisons →
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