Image MIME Reference
KTX
Khronos Texture
image/ktx
VS
WebP Image
image/webp
WebP
A complete technical comparison of Khronos Texture and WebP Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
WebP wins on browser support
Feature Support
| Feature | KTX | WebP |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | ✕ No | Yes |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | ✕ No |
| EXIF Metadata | ✕ No | Yes |
| ICC Color Profile | ✕ No | Yes |
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
WebP Image
image/webp
Extension
.webp
Container
RIFF
Compression
Lossy / Lossless
Algorithm
VP8VP8L
Color Depth
8-bit
Developed by
Google
Released
2010
Magic Bytes
52 49 46 46 XX XX XX XX 57 45 42 50
Browser Support Comparison
| Browser | KTX | WebP |
|---|---|---|
Chrome
|
✕ |
✓ 32+
|
Firefox
|
✕ |
✓ 65+
|
Safari
|
✕ |
✓ 14+
|
Edge
|
✕ |
✓ 18+
|
IE (Legacy)
|
✕ | ✕ |
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)
WebP
WebP Strengths
- Superior lossy compression — 25–35% smaller than JPEG at equivalent quality
- Supports both animation and full alpha transparency
- Lossless mode available with smaller file sizes than PNG
Limitations
- Slower encoding than JPEG, especially for lossless
- Not supported in Internet Explorer or very old browsers
When to choose which format
KTX
Use KTX when…
- Real-time 3D Graphics
- WebGL / WebGPU Applications
- Mobile Games
- Virtual/Augmented Reality (VR/AR)
WebP
Use WebP when…
- Websites
- Ecommerce
- Mobile Apps
- CMS Images