No. Everything runs in this browser tab on your own device. Engines are downloaded once and cached, but your files never leave your computer.

Does it output Draco?

No. It reads Draco files but compresses with Meshopt, which decodes faster and is supported by three.js, Babylon.js and model-viewer.

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / 3D / GLB / glTF Optimizer

GLB / glTF Optimizer

Shrink GLB and glTF files with Meshopt compression, quantisation, mesh simplification, deduplication and WebP texture resizing.

Free, no uploads, no sign-up. Runs 100% in your browser.

How GLB / glTF Optimizer works

The model is processed with glTF Transform (MIT): duplicates and unused data are removed, vertices welded, meshes optionally merged and simplified with meshoptimizer, textures resized and re-encoded with the browser, and geometry compressed with EXT_meshopt_compression. Draco-compressed input is decoded first.

Input: GLB, GLTF, BIN, PNG, JPG. Output: GLB.

How to use GLB / glTF Optimizer

Drop a GLB, or a glTF with its .bin and textures.
Pick the optimisations and the texture size and format.
Press Optimise and compare before and after in the viewer.
Download the optimised GLB.

Tips

Textures are usually most of the file size. 1024 or 2048 px WebP is enough for most web scenes.
Turn off Meshopt and WebP if your target app is older.

GLB / glTF Optimizer FAQ

Is my file uploaded?: No. Everything runs in this browser tab on your own device. Engines are downloaded once and cached, but your files never leave your computer.
Does it output Draco?: No. It reads Draco files but compresses with Meshopt, which decodes faster and is supported by three.js, Babylon.js and model-viewer.
Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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