ASTC Format Hub - Online ASTC Converter & Decoder
Adaptive Scalable Texture Compression
Complete online ASTC format tools. The ultimate ASTC converter (PNG/JPG to ASTC) and ASTC Viewer for mobile development.
About ASTC Format
ASTC (Adaptive Scalable Texture Compression) is a cutting-edge lossy texture compression format developed by ARM. It provides exceptional flexibility with 14 different block sizes, allowing fine-grained control over compression ratio and quality trade-offs.
Adaptive Block Sizes
14 block size options from 4×4 to 12×12, enabling precise control over quality and file size.
Superior Quality
Better visual quality than ETC2 and PVRTC at comparable bit rates with advanced encoding algorithms.
Modern Platform Support
Supported on all OpenGL ES 3.2+ and Vulkan devices, including iOS, Android, and desktop platforms.
Flexible Encoding
Supports LDR, HDR, and 3D textures with full alpha channel support for all block sizes.
Technical Specifications
Available Block Sizes
ASTC supports 14 different block sizes, each offering a different compression ratio:
Compression Details
Bit rates from 0.89 bpp (12×12) to 8.00 bpp (4×4)
Advanced perceptual error metrics for superior visual quality
Hardware Support
OpenGL ES 3.2+ or Vulkan 1.0+
iOS (A8+), Android, Windows, macOS, Linux, WebGL 2.0 (with extension)
Common Use Cases
Mobile Game Development
Primary texture format for modern mobile games requiring high-quality visuals and efficient memory usage.
HDR Textures
Native HDR support makes ASTC ideal for high dynamic range environment maps and lighting data.
Normal Maps
Excellent quality for normal maps and other data textures where precision matters.
UI and Alpha Textures
Full alpha channel support with all block sizes, perfect for UI elements and transparent textures.
ASTC vs Other Formats
Higher quality than ETC2 at similar bit rates with more flexible compression options
Better quality and wider hardware support than PVRTC, not limited to specific GPUs
Competitive quality with BCN formats while maintaining mobile GPU compatibility
Much smaller file size than PNG with hardware-accelerated decompression