Convert GLB to STL Online — From Web to 3D Print

Convert GLB (glTF) models to STL format for 3D printing. Extract geometry from Web3D assets, AR previews, or game models and prepare for physical fabrication.

Maximum Information Loss Warning: This is the most lossy conversion direction. Only geometry is preserved. All materials, textures, animations, and scene hierarchy are discarded. STL is a pure geometry format designed for 3D printing.

Process locally in your browser using WebAssembly — no upload, instant download.

Drag GLB file here, or click to upload

Supports .glb files up to 50MB

Technical Details

Maximum Information Loss

This conversion discards everything except geometry. PBR materials, textures, animations, scene hierarchy, and vertex colors are all lost. The STL will be a gray geometry-only mesh. Multiple meshes in the GLB are merged into a single STL mesh (STL has no scene hierarchy concept).

3D Printing Considerations

GLB models designed for Web3D may have non-manifold geometry. Always check in your slicer before printing. glTF uses meters by default; most slicers assume millimeters -- you may need to scale by 0.001. Web models are often not print-optimized: check for thin walls, overhangs, and support requirements.

Common Use Cases

Print Web3D Assets

Found a model on Sketchfab or in a WebXR app? Convert to STL to 3D print it. Download GLB, convert, import to slicer, check mesh integrity, and print.

AR/VR to Physical Prototypes

Created a product prototype in WebXR or ARKit? Convert GLB to STL to print a physical mockup for ergonomics and fit validation.

Game Assets to Props

Extract game assets from Unity WebGL or Godot HTML5 (exported as GLB) and print cosplay props or tabletop miniatures.

GLB vs STL: Quick Comparison

FeatureGLBSTL
GeometryTrianglesTriangles
MaterialsPBR materialsNot supported
AnimationsSupportedNot supported
Scene HierarchyMulti-objectFlattened (single mesh)
Primary UseWeb3D, AR/VR3D printing
Slicer SupportRequires conversionNative (all slicers)

Use GLB for Web3D display, AR/VR, and real-time rendering. Use STL for 3D printing.

Frequently Asked Questions

Not recommended without inspection. GLB models designed for Web3D often have non-manifold geometry (holes, inverted normals, intersecting meshes). Before printing: import to your slicer, look for warnings, use repair tools (Cura, PrusaSlicer Netfabb, or Meshmixer Inspector).
Unit mismatch. glTF uses meters as the default unit. Most slicers assume STL is in millimeters. A 1-meter cube becomes 1000mm. Fix: scale the model by 0.001 in Blender before exporting, or use the scale tool in your slicer (change 100% to 0.1%).
No. STL is geometry-only. All materials and textures are discarded. The STL will be a single gray mesh. For multi-color prints, use multi-material settings in your slicer or non-standard color STL extensions (limited support).
The GLB likely had multiple meshes. The converter merges all meshes into a single STL. If meshes were not connected (floating in space), the slicer may show them as separate shells. For separate STL files per part, convert GLB to OBJ first, then separate in Blender.
No. The converter is a format translator, not a mesh optimizer. For print-optimized STL: (1) Convert, (2) Import to Meshmixer or Blender, (3) Apply mesh simplification, hollowing, support generation, and wall thickness analysis.

Related Converters

STL to GLB Converter

Reverse conversion: Display your 3D prints on the web.

GLB to OBJ Converter

Need to edit the model before printing? Convert to OBJ first.