What does a Cubemap to Equirectangular converter do?

It is the exact inverse of cubemap slicing. Six square faces each cover a 90° field of view along one axis of a cube; the converter samples them by direction and writes a single 2:1 equirectangular image where longitude runs along X and latitude along Y — the format 360° viewers, YouTube 360, Facebook 360 and VR headsets expect.

When would I need this instead of a cubemap?

Whenever the destination expects a spherical panorama: YouTube or Facebook 360 uploads, Google Street View, mapping onto a sphere in Three.js or Blender, building an AI HDRI environment, or simply sharing one file instead of six.

Are the faces uploaded anywhere?

No. Every face is decoded and stitched in your browser with Canvas pixel maths, so unreleased game art and client work never leave your machine.

Which face order should I use?

Order does not matter because each slot is labeled with its cube direction. If your export uses px, nx, py, ny, pz and nz filenames, px is Right, nx is Left, py is Up, ny is Down, pz is Front and nz is Back.

My panorama looks mirrored or upside down. What went wrong?

That is a convention mismatch rather than broken maths: some exporters rotate the top face 180° relative to the others. Rotate the offending face in an image editor and stitch again.

Can I stitch a five-face export?

Yes. Missing faces are left transparent, so you still get a preview and can see exactly which direction is absent.

What output size should I choose?

Match the source faces: 2048 px faces suit a 4096×2048 panorama, while 512 or 1024 px faces are best at 2048×1024. Exporting larger than the source only interpolates and adds no detail.

Can I go back from equirectangular to cube faces?

Yes. The cubemap generator slices a 2:1 panorama into six rectilinear faces with ZIP export, so the two tools round-trip in either direction.

Cubemap to Equirectangular — Rebuild a 360° Panorama from 6 Faces

Load the six faces your engine exported (+X Right, -X Left, +Y Up, -Y Down, +Z Front, -Z Back) and get one seamless 2:1 equirectangular panorama for YouTube 360, Facebook, Street View, VR headsets or Blender. Exact inverse ray casting, client-side, no upload required.

What Is a Cubemap to Equirectangular Converter?

A cubemap stores an environment as six square 90° faces, one per cube axis. An equirectangular panorama stores the same environment as a single 2:1 image in which the X axis is longitude and the Y axis is latitude. This converter samples every output pixel by direction, finds the cube face that faces that way, and writes the result as one flat seamless image.

How to Convert Cube Faces Back to a Sphere

Collect the six faces: export Rt / Lf / Up / Dn / Ft / Bk or px / nx / py / ny / pz / nz from Unity, Unreal, Blender or a skybox tool.
Drop them into the labeled slots: each slot maps one file to a cube direction, so no face lands upside down.
Stitch to 2:1: choose 1024×512, 2048×1024 or 4096×2048 output and let the ray caster rebuild every direction.
Download or open it: save the PNG, inspect it in the free 360° panorama viewer, or slice it back into faces.

Face Naming Conventions by Engine

Unity 6-Sided Skybox: Front, Back, Left, Right, Up, Down (_Front, _Back, _Left, _Right, _Up, _Down)
Unreal Engine 5: px, nx, py, ny, pz, nz
Three.js CubeTextureLoader: px, nx, py, ny, pz, nz
Blender / Cycles: Left, Right, Up, Down, Front, Back
Source 2 skybox: Rt, Lf, Up, Dn, Ft, Bk

Why Convert Back to a Sphere?

Publishing: YouTube 360, Facebook 360, Google Street View and VR headsets all consume 2:1 equirectangular images.
Engines that expect spheres: Three.js, Babylon.js, Blender world backgrounds and panorama viewers take an equirectangular texture.
Lighting: feed the stitched panorama into the AI HDRI generator to get a 32-bit environment map.
Sharing: one file is easier to send, host and archive than six.

Privacy

All conversion happens in your browser with HTML5 Canvas pixel maths. No face images are uploaded to a server, which makes the tool safe for unreleased game art and client work.