Online KTX2 Converter (KTX2 Encoder) - PNG/JPG to KTX2 / UASTC
Powerful KTX2 encoding. Use this free online KTX2 converter wrapping UASTC/ETC1S combinations quickly taking PNG or JPG into .ktx2 files.
Related Resources
Step 1: Select Image
HDR input note
HDR, EXR, and UltraHDR JPEG files can be used as inputs. Most current output paths still tone map into the RGBA8 encode pipeline; use DDS BC6H, KTX2 RGBA16F, or KTX2 RGBA32F when you need to preserve HDR source data as much as possible.
Basis Universal Compression
Uses Basis Universal codec for optimal compression ratios
Format Support
Supports both UASTC and ETC1S compression modes
Mipmap Generation
Automatically generates mipmap chains for efficient rendering
Khronos Standard
Creates compliant KTX2 files for maximum compatibility
Browser-Based
All processing happens locally in your browser
No Upload Required
Your images never leave your device
How to Use
Upload Image
Drag and drop or select an image file from your device
Choose Format
Select UASTC for quality or ETC1S for compression
Encode
Click encode to convert your image to KTX2 format
Download
Download your compressed KTX2 texture file
Frequently Asked Questions
Yes. You can encode JPG to KTX2, PNG to KTX2, and other common image formats to .ktx2 using UASTC or ETC1S compression.
UASTC provides higher quality compression (4:1 ratio) with excellent visual fidelity, while ETC1S provides higher compression (8:1 ratio) with good quality and universal transcoding support.
Yes, the encoder automatically generates complete mipmap chains for efficient level-of-detail rendering in 3D applications.
KTX2 files require a KTX2 loader library in your application. Most modern graphics engines and frameworks support KTX2 format natively or through plugins.
Compression ratios vary by content: UASTC typically achieves 3:1 to 4:1 compression, while ETC1S can achieve 6:1 to 8:1 compression compared to uncompressed textures.
Yes, both UASTC and ETC1S modes support alpha channels. The encoder automatically detects and preserves alpha information from source images.