PANORAMA TO SKYBOXDrop a panorama.
Drop a panorama.
Get six labeled faces.
In the browser, on your machine, in seconds. EXR, HDR, PNG, JPG. No upload, no signup.
THE MATH, IN ONE PARAGRAPH
A 360° equirectangular panorama is a sphere unwrapped into a rectangle. A cubemap is the same scene re-projected onto the six faces of a cube around the viewer. The conversion samples each face by casting a 90° FOV pinhole camera in the six axis directions and reading where each ray meets the sphere.
SUPPORTED FORMATS
- .exr
- OpenEXR, half- or full-float. HDR range preserved end-to-end when you pick an HDR output encoder.
- .hdr / .hdri
- Radiance RGBE. Same handling as EXR.
- .png
- 8-bit, fine if your source is already tone-mapped.
- .jpg / .jpeg
- 8-bit, lossy. Expect compression artifacts at face edges.
COORDINATES
Right-handed, +Y up. 90° FOV pinhole per face, sampled at pixel centers. Face-up aligned to the horizontal-cross convention used by Blender, Unity, and Unreal.
| Label | Axis |
|---|---|
| Right | +X |
| Left | -X |
| Up | +Y |
| Down | -Y |
| Front | +Z |
| Back | -Z |
QUESTIONS
- Does my HDRI get uploaded anywhere?
- No. Conversion runs in your browser on your GPU via WebGL. The file never leaves your machine, and the page is static — there is no server to upload to.
- Will my HDR data survive the export?
- Yes — if you pick an HDR encoder. The Export popover offers PNG, JPG, and 8-bit TGA (clamped to LDR), 16-bit TGA, PFM at 32-bit float, EXR at half- or full-float, and Radiance HDR. The sphere is sampled in HDR throughout; the chosen container decides whether floats are kept or clamped.
- Which coordinate convention does it use?
- Right-handed, +Y up, 90° FOV pinhole per face, sampled at pixel centers. Right=+X, Left=-X, Up=+Y, Down=-Y, Front=+Z, Back=-Z — the convention Blender, Unity, and Unreal share.
- Will it work with a 16K panorama?
- It will try. Most browsers cap a single texture at ~16384 px on the long edge and run out of memory before that. A 4K source is the sweet spot; 8K works on a 16 GB machine; 16K is a coin flip.
- Does it output Source engine skyboxes?
- Yes. The Source Skybox bundle in the Export popover produces six VTF face textures and the matching VMT materials, named in the Source convention and ready to drop into materials/skybox/ in your mod or game folder.
- Can I use the output commercially?
- Yes. The tool does not assert any rights over your files. Your HDRI's license is whatever its source attaches; this page adds nothing.