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

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 / 3D Model Converter

3D Model Converter

Convert 3D models between GLB, glTF, OBJ, STL, PLY and USDZ, with unit scaling, centring and Z-up fixes.

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

How 3D Model Converter works

The model is loaded with the three.js loaders and written back out with the three.js exporters (GLTFExporter, OBJExporter, STLExporter, PLYExporter, USDZExporter). Scale, unit change, centring and axis fixes are applied before export.

Input: GLB, GLTF, OBJ, STL, PLY, FBX, 3MF, DAE, 3DS, USDZ, AMF, WRL, OFF. Output: GLB, GLTF, OBJ, STL, PLY, USDZ.

How to use 3D Model Converter

Drop a model and any linked files.
Pick the output format.
Optionally change units, centre it or rotate Z-up to Y-up.
Press Convert and download.

Tips

GLB keeps materials, textures and animations in one file.
Use STL for 3D printing; it stores geometry only.

3D Model Converter 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.
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.

Related tools

3D Model Viewer: View GLB, GLTF, OBJ, STL, PLY, FBX, 3MF, DAE, 3DS, USDZ, AMF, VRML, OFF and point clouds with orbit controls, lighting, wireframe and screenshots.
GLB / glTF Optimizer: Shrink GLB and glTF files with Meshopt compression, quantisation, mesh simplification, deduplication and WebP texture resizing.
STL Inspector & Repair: Check STL files before printing: size, volume, weight estimate, watertight and manifold checks, normal flipping and triangle reduction.
Image to Lithophane (STL): Turn a photo into a 3D-printable lithophane or relief heightmap STL, flat or curved, with a live 3D preview.