Validate glTF and GLB files

Find out why a model breaks in an engine or a viewer. The official Khronos validator lists every error and warning with a pointer to the problem.

Files are processed on your device and never sent to a server.

No sign-up, no watermark, no daily limits.

Works in Chrome, Edge, Firefox and Safari on desktop and mobile.

How it works

Is this the official validator?+

Yes, it is the Khronos glTF Validator compiled to run in the browser.

Are warnings a problem?+

Errors break loading; warnings usually do not but may cause rendering differences between engines.

Why does it say a resource is missing?+

A .gltf references external files. Select them together with the .gltf.

Shrink GLB files: Meshopt geometry, WebP or KTX2 (Basis) textures.

Reduce triangle count of any model while keeping its shape.

Generate LOD0–LOD4 from one model, named for Unity and Unreal.

Fix units, Z-up/Y-up and the pivot of a model before import.

Open GLB, FBX, OBJ, STL and 20 more formats; LODs, variants, stats.

Convert FBX, OBJ, STL, GLB, DAE, 3MF, USDZ and more to GLB, glTF, OBJ, STL, PLY or USDZ.

Render a model from 4, 8 or 16 directions into a sprite sheet for 2D games.

Record a spinning video of a 3D model for stores, portfolios and trailers.

FoliMesh generates vegetation and rocks with LOD0–LOD3, collision and a pivot at the base — GLB, FBX or OBJ for any engine.