Free online Gaussian splat viewer for Atlas and Marble worlds

How the splat viewer works

Gaussian splatting represents a scene as millions of tiny, semi-transparent ellipsoids ("splats") with position, scale, rotation, opacity and view-dependent colour. World Labs' Marble exports worlds in this format, and Atlas is expected to output the same family of assets. This viewer decodes the file in a Web Worker, uploads the splats to your GPU and sorts them every frame so they blend correctly from any viewpoint. Why this representation replaced neural radiance fields for capture work is covered in3D Gaussian splatting vs NeRF.

Supported formats

• .ply — the standard 3D Gaussian Splatting output (INRIA layout) used by most training pipelines and by Marble exports.
• .spz — Niantic's compressed splat format, roughly 10× smaller than PLY; a common way to share Marble worlds.
• .splat / .ksplat — compact formats used by antimatter15 and mkkellogg web viewers.

Which one to keep and which to ship is covered inGaussian splat file formats: .ply, .spz, .splat and .ksplat; if a file refuses to load here, how to open a .ply or .spz splat file lists the usual causes.

Controls

• Left-drag to orbit, right-drag to pan, scroll or pinch to zoom.
• Use Reset view to return to the default camera and Fullscreen for a distraction-free look.
• Large files (hundreds of MB) work but take time to decode; convert to .spz first for faster loading.

SPZ viewer online: open .spz files without installing anything

Most "how do I open this" questions about Gaussian splats are really about .spz. It is the compressed format Marble hands you on export and the one people share, because a scene that is 300 MB as a PLY is about 30 MB as an SPZ. No default desktop app opens it. This page does: choose the file or drag it onto the canvas above, the decoder runs in a Web Worker, and the splats appear in a few seconds. No account, no upload, no plugin. The same goes for .ply, .splat and .ksplat.

Browser viewer vs desktop splat tools

A browser viewer is for looking, not editing. If you need to crop a scene, delete floaters, re-centre it or convert between formats, use a desktop or web editor such as PlayCanvas' SuperSplat, then come back here to check the result or send someone a link they can open on a phone. On mobile this viewer handles roughly one to two million splats comfortably; on a laptop with a discrete GPU, several million. If a file is too heavy for the device, convert it to .spz first and it will usually load.

Viewing worlds from Atlas and Marble

Export a world from Marble as a splat, download the .spz or .ply, then drop it here. When the Atlas API opens and generation goes live on this site, generated worlds will open in this same viewer automatically. For engine imports see thegame development guide.