Online KTX2 Converter & Compressor - PNG/JPG to KTX2 (ETC1S/UASTC)
Powerful KTX2 encoding. Use this free online KTX2 converter wrapping UASTC/ETC1S combinations quickly taking PNG or JPG into .ktx2 files.
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Step 1: Select Image
Drag and drop an image here
or
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 Supercompression
Leverages Basis Universal to produce ultra-compact KTX2 textures built for WebGPU, WebGL, and modern 3D web graphics.
Format Support
Supports both UASTC and ETC1S compression modes
Mipmap Generation
Automatically generates mipmap chains for efficient rendering
Khronos Standard & Web3D Ecosystem
100% Khronos KTX 2.0 compliant, ready out of the box for Three.js (KTX2Loader), Babylon.js, and glTF/GLB models (KHR_texture_basisu).
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.
In Three.js, use KTX2Loader with Basis transcoder; in Babylon.js, load KTX2 via native KhronosTextureContainer2. In glTF/GLB pipelines, KTX2 powers the KHR_texture_basisu extension, dramatically reducing 3D model asset transfer size and GPU VRAM usage.
While PNG/JPG must decompress into full uncompressed RGBA in GPU VRAM (causing mobile browser crashes and lag), KTX2 textures transcode directly into native GPU formats (BCn, ASTC, ETC). This slashes VRAM usage by 70%-85% and eliminates texture upload stutters.
Yes, both UASTC and ETC1S modes support alpha channels. The encoder automatically detects and preserves alpha information from source images.