glTF to STL converter

How to convert .gltf to .stl

To convert a .gltf file to STL, choose a self-contained file, leave STL selected and convert. Inspect orientation, the number of visible pieces and the model dimensions. Download the STL and import it as millimeters in the receiving application.

Before you convert .gltf to STL, check the actual mesh buffers referenced by the scene. A JSON file that points to missing local .bin files is incomplete. Use a self-contained export, or place one supported model and its required resources together in a ZIP for the ZIP converter.

Convert one packaged model with its local resources · Convert a binary GLB package instead

Check size after a .gltf to .stl conversion

glTF uses meters. This tool scales that geometry into millimeter-sized STL coordinates, so a one-meter object should be interpreted as 1,000 mm in the destination. STL does not reliably declare units: confirm that the receiving application imports those coordinates as millimeters.

Understanding how to convert glTF to STL includes checking the units after export. The camera fits the preview to the available area, so that view alone cannot prove the scale is correct. Measure one known edge or overall dimension after reopening the downloaded STL.

Which parts of the glTF scene are exported?

This .gltf to .stl converter reads supported static mesh geometry with scene transforms applied. Animation, skin deformation, morph targets and compressed geometry extensions are not guaranteed. Export an evaluated static mesh in the source application when the desired result depends on a pose or deformation.

A gray preview is expected. Standard STL carries triangles rather than the glTF material system, lights, cameras or texture images. If a painted feature must appear in a physical print, model that feature as surface geometry before exporting.

Review scale and scene geometry before STL export · Inspect the converted STL

Processing limits

STEP input: 20 MB. STL, OBJ and 3MF input: 50 MB. Output is limited to 1.2 million triangles. Complex models may need simplification in the source application.

One file at a time. Processing stops after 90 seconds. Files remain in browser memory, and no conversion upload is performed. Replacing a file clears the previous result. Closing the tab releases its working data.