Online Basis Viewer & Converter - Open .basis Files & Convert to PNG Free
Free online Basis Universal viewer and decoder. Open, preview, and inspect .basis texture files (ETC1S, UASTC) in your browser. Convert Basis to PNG instantly without upload.
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Upload Basis File
Drag and drop a Basis file here
or
Key Features
Universal Transcoding Preview
Simulates client-side GPU transcoding in real-time, displaying both ETC1S and UASTC textures instantly.
Browser-Based Decoding
All decoding happens locally using WebAssembly - no server uploads
Real-Time Preview
Instantly view decoded textures with interactive zoom and pan controls
Channel Filtering
View individual RGBA channels or combined RGB output
PNG Export
Export decoded textures as standard PNG images
Detailed File Info
View comprehensive metadata including format, dimensions, and compression type
How to Use
Upload Basis File
Drag and drop or click to select a .basis file from your computer
View Decoded Image
The decoder will automatically transcode and display your texture
Inspect Details
Use channel filters and zoom controls to examine the texture in detail
Export if Needed
Download the decoded texture as a PNG file if required
Frequently Asked Questions
A .basis file is a universal texture container created by Binomial. Unlike DDS or ASTC which are locked to specific GPU hardware architectures, a single .basis file transcodes on-the-fly to whichever compressed format the target device requires (BCn for desktop DirectX, ASTC for iOS/Android, ETC2, or PVRTC).
Yes, this decoder supports both ETC1S and UASTC compression modes used in Basis Universal files.
No, all decoding happens locally in your browser. Your files never leave your device.
Technical artists can isolate R, G, B, and A channels to verify that compression algorithms have preserved vital detail across tangent-space normal vectors, metallic/roughness channels, and alpha masks without block artifacts.
You can export the decoded texture as PNG, which represents the transcoded output. Note that lossy compression means the result won't be pixel-perfect to the original source image.
Basis Universal uses lossy compression, so some quality loss is expected. The amount depends on whether ETC1S (more loss) or UASTC (less loss) was used during encoding.
The current version displays the base mipmap level. Support for viewing all mipmap levels is planned for a future update.
Any modern browser with WebAssembly support can run the decoder, including Chrome, Firefox, Safari, and Edge.