Free STL to GLB converter

Why convert STL to GLB?

STL is the language of 3D printers; GLB is the language of AR and the web.

How to convert STL to GLB

1. Choose your STL file. Drop it on the box above, or tap to browse. You can pick several files at once.
2. Confirm the target is .glb. It is preselected when your browser can encode it; otherwise the closest available target is chosen. Adjust quality, size or the other options if you want to.
3. Convert and download. Press Convert, then Download. Your file stays on your device the whole time.

What is a .stl file?

STL describes a surface as nothing but triangles: no colour, no texture, no units. That bluntness is exactly what 3D printing needs, which is why it remains the standard format for sending a model to a printer or a print service.

What is a .glb file?

GLB is the single-file binary form of glTF, and the format the augmented-reality world has standardised on — Android's Scene Viewer, web viewers, Unity and three.js all take one directly. Geometry, materials and animation travel in one file that loads fast.

What to expect from this conversion

Geometry is converted exactly, with node transforms applied so the model keeps its pose. Materials, textures and animation are not carried across. Check the scale in your viewer: STL files carry no units, so a model exported in millimetres can appear a thousand times too large. An STL has no colour or texture, so the result is untextured geometry.

Is it private?

Yes, by design. Every conversion happens inside your own browser using your device’s processor — there is no server that receives your STL file, so there is nothing for anyone to store, scan or leak. You can confirm it yourself: open your browser’s developer tools, watch the Network tab while you convert, and you will see no upload.

Questions about STL to GLB

Is this STL to GLB converter free?

Yes, completely. There is no account, no daily limit, no watermark and no premium tier.

Is my STL file uploaded to a server?

No. The conversion runs inside your own browser using your device's processor. The file is read from your disk, converted in memory and saved back to your disk — nothing is transmitted, so there is nothing for anyone to store.

Can I convert STL to GLB online without downloading software?

Yes. This is an online STL to GLB converter that runs in your browser, so there is nothing to install and no app to trust with your files. It works the same on a phone.

What happens to the quality?

Geometry is converted exactly, with node transforms applied so the model keeps its pose. Materials, textures and animation are not carried across. Check the scale in your viewer: STL files carry no units, so a model exported in millimetres can appear a thousand times too large. An STL has no colour or texture, so the result is untextured geometry.

Can I convert several STL files at once?

Yes. Select as many files as you like and they are converted one after another in a single tap, with a download for each and a zip of all of them.

Can I convert STL to GLB without Blender or a script?

Yes — that is what this page is for. Blender does the same job well if you already have it set up and thousands of files to process; for one file, or a handful, the browser is faster than installing anything.

Should I keep the original STL file?

Yes — keep it, converting never touches it. The reason to make a copy in another format is that STL describes bare triangles with no colour, texture or material at all.

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