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cadformats.com/convert/gltf-to-glb

.gltfglTF→.glbGLBlossless

Convert glTF to GLB

Convert glTF to GLB in your browser. The conversion runs on this page and the file never leaves your computer.

Drop your .gltf file

up to 250 MB · .gltf

Free, and it opens in this tab. Nothing is uploaded, and there's no account to make.

Runs locally · nothing uploaded

Before you convert: what this keeps and what it destroys

Preserved

  • The geometry, triangle for triangle
  • Overall dimensions and proportions
  • Watertightness, where the input is watertight
  • Colour
  • Separate parts and their positions

Destroyed

  • A recorded unit: GLB stores none

↺ the reverse: GLB → glTF · about .gltf · about .glb · just view it instead

Which glTF files can this page convert?

Use a glTF file with its geometry buffers embedded. A .gltf that references a separate .bin file is incomplete for this single-file converter. Ask the sender for an embedded export or for a GLB containing the geometry.

The output uses the supported geometry, node structure and base colours read by this site. The conversion does not preserve image textures, animation or skins, even though the glTF and GLB formats can store them. Keep the original glTF and its companion files for textured or animated work.

Does GLB change the model's size or detail?

glTF and GLB both use metres. Packing glTF into GLB does not require a unit change or add surface detail.

Binary packaging avoids the base64 encoding used by some embedded glTF files. The size difference depends on how the source was packaged and which features the converter reads. A smaller download can also mean data was dropped. Check the output and the conversion warnings.

The conversion runs in your browser. Your file stays on your computer and is not uploaded.

Going the other way

Convert GLB back to glTF. The reverse conversion also works with mesh geometry. It does not reconstruct exact CAD surfaces. Material data and part structure lost in either direction cannot be restored by converting back. Keep the original file for later edits.

How we know this conversion works

This pair was checked against 1 file from the test corpus on 2026-09-04. Each run parses its own output back in and compares the bounding box, the triangle count and, for closed solids, the volume against the input.

A pair that fails those checks doesn't get a page. That's why this site lists 120 conversions and not the several hundred a format-times-format grid would suggest.