Convert STL to GLB Online — Free
Upload a Stereolithography file and download it as GL Binary. Runs entirely in your browser — no server uploads.
About These Formats
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.
GL Binary
GLB is the binary form of the GLTF format — a compact, web-optimized container that bundles geometry, textures, and animations into a single file.
Used with
Three.js, Babylon.js, React Three Fiber, Unity, Unreal Engine, Blender, AR/VR applications.
What Transfers from STL to GLB
A breakdown of which data survives the STL-to-GLB conversion.
3D Geometry
Vertices, faces, and normals always transfer
Textures & Materials
STL contains no texture data
Animations
STL does not store animations
Vertex Colors
STL does not support vertex colors
Multiple Objects
STL stores a single mesh
When to Convert STL to GLB
Convert STL to GLB when you need a web-ready, self-contained 3D asset. GLB is the preferred format for Three.js, React Three Fiber, Babylon.js, and Needle Engine. It bundles geometry, textures, and animations into a single binary file, making it ideal for fast web loading and AR/VR applications.
STL to GLB — What to Know Before Converting
The GLB output bundles all geometry, materials, and textures into a single self-contained binary — no companion files needed. Binary encoding typically reduces file size by 20–40% compared to text-based source formats. The file loads directly in Three.js, Babylon.js, React Three Fiber, Unity (GLTF importer), and Unreal Engine's built-in GLTF pipeline.
Other STL Conversions
Tips for the Best STL to GLB Result
Set the model origin to the centre of mass before exporting from your DCC tool. A misplaced pivot causes models to appear offset or rotate incorrectly in Three.js and AR viewers.
Apply all transforms (scale, rotation, location) before export — un-applied transforms produce unexpected scaling when the GLB is loaded in another application.
Keep combined texture size under 4 MB for smooth web delivery. Use the Texture Resizer tool to downscale large maps if needed.
In Unity, install the "GLTF Fast" or "UnityGLTF" package — Unity's default model importer does not support GLB natively.
Validate the GLB at gltf.report or the Khronos GLTF Viewer before deploying to catch material or mesh issues early.
Common Reasons to Convert STL to GLB
- →Web 3D: loading assets in Three.js, Babylon.js, React Three Fiber, or any WebGL / WebGPU renderer
- →E-commerce: embedding interactive 3D product viewers on Shopify, WooCommerce, or custom storefronts using <model-viewer>
- →Game engines: importing into Unity (GLTF importer package) or Unreal Engine's built-in GLTF pipeline with PBR materials intact
- →AR / VR: GLB is the standard asset format for WebXR experiences, iOS AR Quick Look, and Meta Quest browser apps
- →AI 3D generation: SphereLinks exports all AI-generated models as GLB with full PBR textures — ready to drop into your project immediately
Frequently Asked Questions
How do I convert STL to GLB?
Upload your .stl file using the tool above, confirm the source format is set to STL and the target is GLB, then click Convert. The file processes in your browser and you can download it immediately.
Does converting STL to GLB preserve textures?
Yes. Converting to GLB preserves PBR materials and embedded textures from the source file.
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.