How to Convert HDRI to Cubemap
- Upload Your HDRI Environment: Open a 2:1 Radiance .hdr panorama up to 50 MiB / 8K. PNG, JPEG and WEBP also work. OpenEXR is not supported.
- Select Face Resolution: Choose 512×512, 1024×1024, or 2048×2048 pixels per face.
- Live 6-Face Preview: Inspect all 6 rectilinear faces rendered in real-time with zero optical pinch.
- Download Batch ZIP: Save posx.png, negx.png, posy.png, negy.png, posz.png, and negz.png in one click.
Features of Our Free HDRI Cubemap Slicer
- Zero Spherical Distortion: Uses exact tangent-space ray casting to eliminate polar pinching and seam artifacts.
- Instant Client-Side Processing: Decoding, tone mapping and slicing run locally in your browser. No textures are uploaded to cloud servers.
- Plug-and-Play Unity & Unreal Engine: Naming matches Unity Skybox / 6 Sided shaders and Three.js CubeTexture loaders directly.
- 8-bit PNG Output: Export tone-mapped skybox images. Keep the original .hdr for high dynamic range environment lighting.
Frequently Asked Questions
What face naming convention is used in the ZIP archive?
The archive packages posx.png (Right +X), negx.png (Left -X), posy.png (Top +Y), negy.png (Bottom -Y), posz.png (Front +Z), and negz.png (Back -Z).
Is my HDRI file kept private?
Yes. The entire projection pipeline executes locally in your browser memory using the Radiance decoder and HTML5 Canvas. Your 3D assets never leave your workstation.
Related 360° Panorama & Game Tools
- Cubemap Generator — Slice 360 panoramas into 6 cube faces.
- Cubemap to Equirectangular — Stitch 6 cube faces back into a seamless 2:1 panorama.
- AI HDRI Generator — Generate 360° HDR environment maps with AI.
- HDRI Viewer — Inspect 360 HDRIs with real-time exposure and tonemapping.
- Skybox Generator — Create panoramic game skyboxes.