Drop a .glb and get a printable .stl back in seconds. The conversion runs entirely inside this page — your file is never uploaded, there is no signup, and there is no watermark on anything that comes out.
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.
STL is the oldest and simplest format in 3D printing, and that is its virtue: a bare list of triangles with surface normals, nothing else. Every slicer ever written opens one without asking questions, which is why the printing world still runs on 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.
Keep the original. This is a one-way trip: if you later want the textured version for a web viewer or a render, you will need the file you started with. Converting back returns the geometry but never the material.
The short answer: when the next program in your chain is a slicer. Bambu Studio, PrusaSlicer, Cura, Orca and Chitubox all want a solid body made of triangles, and STL is the format they have agreed on for thirty years.
.glb; your printer wants .stl. This converter is the bridge, and it is the single most common reason anyone converts GLB to STL at all.Do not convert if the destination already understands GLB. Blender, Unity, Unreal, Godot, Three.js and every AR viewer read it natively and keep the texture — open it in the free viewer first if you are not sure what is in the file.
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 — and no converter anywhere can do it. The STL format stores triangles and nothing else: no UVs, no materials, no colour. If you need colour on a printed part, convert to 3MF instead, which has room for it.
Probably not on the first import, and that is normal. A GLB usually describes itself in metres while most slicers read an STL as millimetres, so the model can land a thousand times too small. Scale it once in the slicer and move on — the geometry is correct, only the unit label was missing.
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