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Image MIME Reference
HEIC

High Efficiency Image Container

image/heic
VS

Khronos Texture

image/ktx
KTX

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

HEIC wins on browser support

Feature Support

Feature HEIC KTX
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
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 →
Khronos Texture
image/ktx
Extension
.ktx
Container KTX (Khronos Texture 1.1)
Compression Uncompressed / GPU Compressed (ASTC, ETC, BCn, PVRTC)
Algorithm
ASTCETC1 / ETC2BCn (DXT)PVRTCBasis Universal (in KTX2)
Color Depth 8-bit, 16-bit, 32-bit (Integer/Float)
Developed by Khronos Group
Released 2010
Magic Bytes
AB 4B 54 58 20 31 31 BB 0D 0A 1A 0A
Full KTX reference →

Browser Support Comparison

Browser HEIC KTX
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✓ 11+
 ✕
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
KTX

KTX Strengths

  • Enables direct-to-GPU texture uploading, drastically reducing load times and CPU overhead in 3D applications
  • Supports complex texture types natively (mipmaps, cubemaps, 3D volumes, texture arrays)
  • Standardized across major Khronos APIs (OpenGL, Vulkan, WebGL) unlike vendor-specific formats like DDS
Limitations
  • Requires custom JavaScript loaders to parse and display on the web
  • Zero native support in consumer image viewers or 2D photo editing software
  • Format fragmentation: a KTX file containing an ASTC payload will fail to render on hardware that only supports BCn compression (KTX2 and Basis Universal solve this)

When to choose which format

HEIC
Use HEIC when…
  • iOS / iPhone Photography
  • macOS Ecosystem
  • High-Quality Image Archiving
KTX
Use KTX when…
  • Real-time 3D Graphics
  • WebGL / WebGPU Applications
  • Mobile Games
  • Virtual/Augmented Reality (VR/AR)

More comparisons

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