Are my images uploaded to an external server?

No. The entire cubemap slicing process runs 100% locally in your web browser via HTML5 Canvas and WebGL. No image files are ever uploaded or saved.

What naming convention does the downloaded ZIP use?

The files are named posx.png (Right), negx.png (Left), posy.png (Up), negy.png (Down), posz.png (Front), and negz.png (Back), perfectly matching Unity and Three.js standards.

Is the Cubemap Generator completely free?

Yes, it is completely free with no restrictions or usage quotas.

Cubemap Generator: Slice 360° Panoramas to 6 Cube Faces

Convert 2:1 equirectangular spherical panoramas into 6 rectilinear cube faces (+X Right, -X Left, +Y Top, -Y Bottom, +Z Front, -Z Back) with client-side WebGL math. One-click batch ZIP download for Unity Skyboxes, Unreal Engine, and Three.js.

Highlights

Zero Distortion: Exact inverse tangent ray casting preserves geometry.
Complete Privacy: 100% client-side WebGL conversion.
Standardized Naming: posx, negx, posy, negy, posz, negz for Unity.
Batch ZIP Export: Download all 6 cube faces bundled in one archive.