Convert GLTF to STL Online — Free
Upload a GL Transmission Format file and download it as Stereolithography. Runs entirely in your browser — no server uploads.
About These Formats
GL Transmission Format
GLTF is the Khronos open standard for 3D assets — a JSON-based format that describes scenes, meshes, materials, animations, and cameras with external texture files.
Used with
WebGL applications, game engines, AR/VR platforms, and cross-tool 3D workflows.
Stereolithography
STL stores only triangulated geometry — no colors, textures, or animations. It is the de-facto standard for 3D printing slicers and CAD software.
Used with
3D printing slicers (Cura, PrusaSlicer, Bambu Studio), CAD tools, rapid prototyping workflows.
What Transfers from GLTF to STL
A breakdown of which data survives the GLTF-to-STL conversion.
3D Geometry
Vertices, faces, and normals always transfer
Textures & Materials
STL is geometry-only — textures are discarded
Animations
Animations dropped — STL is a static format
Vertex Colors
STL does not support vertex colors
Multiple Objects
Multiple meshes merged into one on export
When to Convert GLTF to STL
Convert GLTF to STL when you need to 3D print the model. STL is the universal format for slicing software like Cura, PrusaSlicer, and Bambu Studio. Note that STL contains geometry only — colors and textures from the GLTF source will not be included.
GLTF to STL — What to Know Before Converting
GLTF files can contain skeletal animations and morph targets. STL is a static format — animations will not carry over, and the converter exports the mesh in its rest pose. To preserve animation data, convert to GLB or FBX instead.
STL stores raw triangulated geometry with no colour, material, or texture data. This is intentional for 3D printing — slicers (Cura, PrusaSlicer, Bambu Studio) apply their own material and print settings. Before slicing, verify the mesh is watertight: open meshes with holes or non-manifold edges are a common cause of slicing errors.
Other GLTF Conversions
Tips for the Best GLTF to STL Result
Run the STL through a repair tool (Meshmixer, Netfabb, or PrusaSlicer's built-in repair) to fix non-manifold edges and holes before printing.
This converter outputs binary STL, which is ~6× smaller than ASCII STL and preferred by all major slicers.
STL stores no unit information. In your slicer, confirm the scale explicitly — FDM printers work in millimetres, but some CAD tools export in metres.
Minimum wall thickness for reliable FDM printing is ~1.2 mm. Review thin sections in the slicer's layer preview before printing.
Common Reasons to Convert GLTF to STL
- →FDM and resin 3D printing: the universal input format for Cura, PrusaSlicer, Bambu Studio, ChituBox, and all major slicers
- →3D print services: Shapeways, Materialise, Craftcloud, and local print bureaux all accept STL as their standard format
- →CNC milling: many CAM packages accept STL geometry for toolpath generation
- →Physical validation: printing a scale model to check form, proportion, and fit before committing to production tooling
Frequently Asked Questions
How do I convert GLTF to STL?
Upload your .gltf file using the tool above, confirm the source format is set to GLTF and the target is STL, then click Convert. The file processes in your browser and you can download it immediately.
Does converting GLTF to STL preserve textures?
STL stores geometry only. Textures and materials will not be included in the output.
Is this converter free?
Yes, completely free. No account, no usage limits, no hidden fees.
Are my files uploaded to a server?
No. All processing happens locally in your browser using WebGL. Your files never leave your device.