Drop an .stl below and download it as glTF 2.0 JSON — the standard format of web 3D. The conversion runs in your browser and nothing is uploaded. Prefer a single compact binary? The STL to GLB converter writes a .glb instead.
Converted locally · never uploaded · no signup
STL is for slicers; glTF is what browsers, engines and AR runtimes load natively. This converts one to the other in seconds.
STL repeats vertices per triangle; glTF stores them indexed, so the output is typically much smaller than the source.
Parsed and exported with three.js in your browser — no upload, no account, no waiting.
Drag the .stl in and check the live preview.
The mesh is re-encoded as glTF 2.0 JSON with embedded buffers.
Load the .gltf in three.js, Babylon, <model-viewer> or your engine of choice.
STL ends at the printer — browsers and engines don't load it. If you want to show a printable design on a product page or portfolio, feed it to a game engine, or run it through glTF-based tooling, converting to glTF gives you a standards-compliant asset every modern 3D stack accepts. For pure deployment the binary GLB variant is smaller; the JSON .gltf shines when tooling wants to read the file.
STL carries no color or material data, so the glTF is written with a neutral standard material. The geometry and computed normals convert exactly — ideal for assigning materials in a web viewer's environment, in Blender, or with Sculpty's texturing studio, which generates PBR textures from a text prompt.
Yes — free and unlimited, with no signup and no watermark.
No. The STL converts to glTF entirely in your browser and downloads straight from memory.
Same data, different container. GLB is smaller and best for shipping; .gltf is JSON and best when you or your tooling need to read the file. Both converters are free here.
A neutral default material, since STL carries none. Texture the model afterwards in your tool of choice.
Type a prompt, get a textured 3D model in about a minute — then download it as GLB, STL, OBJ, FBX or USDZ.
Generate a model from text →