3MF is what STL should have been, and Bambu Studio, PrusaSlicer and Cura all prefer it. This converter writes one from your .glb in seconds, in your browser, with no upload and no account.
Three steps, one page, no account. The whole conversion is a local operation — the slowest part is you finding the file.
Drag the file onto the box above. It is read straight off your disk with the browser's File API — no upload, and no progress bar to a server.
The file is parsed, every mesh is baked into world space, and the result is written out in the target format. Your CPU does the work, so a client's unreleased model never leaves the room.
Save the converted file and open it wherever you were headed. Nothing is watermarked and nothing expires.
They solve different problems, which is exactly why one direction of this conversion costs you something and the other does not.
GLB is the binary flavour of glTF — one file carrying geometry, UV coordinates, materials, textures and a scene graph together. It is what the web, Blender, Unity, Unreal and Three.js all read natively, and it is what this site's generator hands you.
3MF is the modern replacement for STL, backed by the printing industry. It is a zipped XML package that states its own units, keeps shared vertices intact and has room for colour and print settings — which is why Bambu Studio, PrusaSlicer and Cura all prefer it.
Every conversion is a trade. Any tool that tells you otherwise is lying to you, so here is the exact ledger before you commit.
3MF is the better STL. Same geometry, but it declares its own units, so the first slicer import lands at the size you meant. Other conversions are one click away if your printer software is older.
Convert to 3MF when the file is going to a modern slicer and you would rather not fight the scale. The package states its own units, which removes the single most common import surprise in 3D printing.
One caveat worth stating plainly: the format supports colour, but this converter writes the core mesh only, so expect a single-colour model. Preview the GLB first if the colour was the point.
You do not have to go back to the home page. Type a prompt or drop an image, and take the .glb — free, anonymous, no watermark.
No. The 3MF specification has room for colour, but the file this converter writes contains the core mesh and nothing else, so it arrives in a single colour. If colour is what you need, keep the GLB for viewing and use the 3MF for printing.
3MF, if your slicer is from the last few years. It declares its units, preserves shared vertices and has a place for print settings, all of which STL lacks. Use STL only when the software at the other end is too old to read anything else.
Same converter, same rules: free, in your browser, no signup.
3D AI Studio generates the .glb too — free, anonymous, no watermark.
No signup, no upload, no watermark — and the converter does not care how big the file is.
FreeNo signupNothing uploadedNo watermark
