Free Online GLTF to STL 3D Model Format Converter Tool

Convert GLTF to STL in your browser

This page converts a GLTF file to STL directly in your browser, with nothing uploaded. Choose a file, check it in the preview, press convert and download the result. The converter reads the model with three.js, shows it, and writes a new file with the matching three.js exporter. Because formats store different things, some information can be lost; the sections below list what carries over and what does not for this exact pair.

The formats in this conversion

Source format: GLTF

GL Transmission Format (JSON) (.gltf)

What it stores: A scene described in JSON: meshes, materials, textures, skins and animations, usually with geometry and images in separate .bin and image files or embedded as base64.
How this converter reads it: Read with GLTFLoader: geometry, materials and embedded textures are used, animation clips are ignored.

Target format: STL

Stereolithography (STL) (.stl)

What it stores: A surface as a list of triangles, in binary or ASCII form, with no colours, materials or units in the standard format.
How this converter writes it: Written as binary STL: world-space triangles only, with no colours, materials, UVs or object names.

GLTF to STL: what carries over

Carried over

The mesh geometry, meaning vertex positions and triangle faces, is written to the STL file.

Lost or not written

The STL output written here does not include material definitions, so the materials from the GLTF file are dropped.
Texture images from the GLTF file are dropped, because the STL output written here contains no images, so surfaces lose their painted detail.
The STL output written here cannot hold per-vertex colours, so colours from the GLTF file are lost.
STL stores only a flat list of triangles, so object names, hierarchy and separate meshes from the GLTF file are merged into one.
Animation is not exported: the converter reads the static scene of the GLTF file, so animation clips are not carried into the STL file.

Good to know

Coordinates are copied unchanged and never rescaled, but GLTF and STL do not treat units the same way (glTF uses metres, OBJ, STL and PLY define no unit, VOX counts voxels), so check the scale after importing.

What this converter does

Reads GLTF and writes STL on your device; the file is never uploaded.
Previews the GLTF model in 3D before you convert, with orbit controls.
Produces a new STL file for download and leaves your original untouched.
Re-centres the model on the origin and never rescales it.

How to convert GLTF to STL

Check that the two dropdowns show GLTF as the source and STL as the target.
Select your GLTF file; it appears in the preview.
Press the convert button and wait for the progress bar to finish.
Download the STL file and open it in your target application.
Check scale, materials and colours there, using the notes above as a guide.

Supported conversions

GLB, glTF, OBJ, STL, PLY and VOX files can be converted to glTF, OBJ, STL or PLY, which gives 20 combinations. A format is never converted to itself, but GLB to glTF is available. GLB and VOX are input only, so there is no conversion to GLB or VOX, and FBX or 3MF files can be viewed with the viewer but not converted.

GLTF to STL converter FAQ

Is my GLTF file uploaded when I convert it?

No. Reading the GLTF file and writing the STL file both happen in your browser with JavaScript. Nothing is sent to a server, and the result exists only on your device until you download it.

Which 3D formats can I convert between?

GLB, glTF, OBJ, STL, PLY and VOX can be converted to glTF, OBJ, STL or PLY. GLB and VOX are input only, and FBX or 3MF files can be viewed but not converted. The list of all converters below links to every available pair.

Why did my converted file lose colours or textures?

Each output format keeps only what its exporter writes. OBJ output has no .mtl file or textures, STL stores triangles only, and PLY keeps vertex colours but no textures. Only glTF output keeps materials and embedded textures. The notes above show what this pair carries over.

Is animation kept when I convert GLTF to STL?

No. The converter reads the static model and does not export animation clips, so keyframes or skeletal animation in a GLB or glTF file are not carried over. If you need animation, export it from your original 3D software.

My .gltf has separate .bin or texture files. Can I convert it?

Only if everything is embedded in the one file you select. The converter reads a single file and cannot fetch .bin or image files stored next to it, so such a glTF may fail or lose its textures. Convert from a GLB or an embedded glTF instead.

Is there a file size limit?

The tool does not enforce one. Large models are limited by your device's memory and graphics hardware, and they may convert slowly or fail, especially on phones. Try a smaller or simplified file if the conversion does not finish.

Will my model keep its size and position?

Coordinates are copied without scaling, but the converter moves the model so that its bounding box is centred on the origin. glTF uses metres while OBJ, STL and PLY define no unit, so check the scale after importing.

Free Online GLTF to STL 3D Model Format Converter

Hunyuan Motion from one sentence, then preview the clip