Convert OBJ to glTF
Convert OBJ to glTF in your browser. The conversion runs on this page and the file never leaves your computer.
Result
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: glTF stores none
↺ the reverse: glTF → OBJ · about .obj · about .gltf · just view it instead
Why people convert OBJ to glTF
Modernising a mesh for the web, with the result in a form you can read.
The gain in structure is real. OBJ's object and group names become actual glTF nodes with transforms, so a model that was a flat list of named lumps arrives with a hierarchy a viewer can navigate.
The file written here embeds its buffer as base64 and stands alone, which sidesteps the missing-.bin problem that ruins so many glTF handoffs. Coordinates are divided by 1000 from millimetres into glTF's metres. Colour will be absent unless it was in the .obj itself, since a .mtl sidecar is not part of a single-file upload.
What you get
You get a plain-text glTF file you can open in an editor containing the same triangles the OBJ file described. No geometry is added, removed or approximated: mesh-to-mesh conversion is a change of container, and this site's tests check that the triangle count comes out identical.
The output uses metres, as required by the glTF specification.
Carried across: colour available in the selected OBJ (external materials are not read), the supported part structure.
The conversion runs in your browser. Your file stays on your computer and is not uploaded.
What to check afterwards
- OBJ carries no unit. The numbers in the file are just numbers, so the conversion assumes millimetres. Check the overall dimensions of the result before you commit to machining or printing it. A file exported from a package set to inches will be 25.4 times out.
- The numbers change. glTF is read in metres and OBJ in millimetres, so every coordinate is rescaled. The result is the same physical size, but the numbers in the file are different numbers.
If you need something this conversion cannot give you
This pair loses very little. glTF carries what OBJ carries, so the main reason to choose a different target is what the receiving software accepts.
Going the other way
Convert glTF back to OBJ. 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 3 files 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.