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GLB to STL

GLB to STL Converter for 3D Printing

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About This Tool

This tool extracts the static mesh from a GLB and exports STL for slicing. Animations and skeletons are not kept. Before printing, check that the model is a closed watertight solid and that the units are correct. Everything is processed locally in your browser, so your file never leaves your device.

Tips

  • 1Only the geometry is kept.
  • 2Multiple meshes are usually merged into one STL.
  • 3Check for a closed watertight solid before printing.

About Configuration Options

General Settings

Coordinate System

DefaultY-up

Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.

Y-upRecommended

Convention used by OpenGL, Three.js, and most Web 3D engines. Choose this for models from web or game engines.

Z-up

Convention used by Blender (default), 3ds Max, and some CAD software. Try this if the model appears sideways.

Rotation X

Default0°

Range-180° – 180°

Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation.

Rotation Y

Default0°

Range-180° – 180°

Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation.

Rotation Z

Default0°

Range-180° – 180°

Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation.

Rotation Application

DefaultRoot node transform

Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.

Bake into vertices

Rotation is written into all vertex coordinates and applies consistently to every export format; geometry data is rewritten.

Root node transformRecommended

Rotation is written as a root node transform while vertex coordinates stay unchanged; better for skinned or animated models, but formats that ignore node transforms (such as STEP) won't apply it.

STL Output Settings

Binary Format

DefaultBinary STL

Choose the STL storage format. Both formats produce identical print results.

Binary STLRecommended

Smaller file, faster to load. Supported by Cura, PrusaSlicer, Chitubox and all major slicers. Recommended for 3D printing.

ASCII STL

Plain text format, readable in any text editor for debugging. File size is ~4-6x larger than binary.

Split Multiple Parts

Export independent meshes as separate STL files packaged in a ZIP archive.

Format Information

Input format

Extension:
glb
Full Name:
GL Transmission Format Binary (glTF 2.0)
Type:
3D Model
Format:
GLB
Tools:
Three.js、Babylon.js、Blender
Open With:
3D Model Viewer、GLB Viewer
Description:
GLB is the binary glTF 2.0 format from Khronos Group, packing meshes, materials, textures, and animations into one file. It is the standard for Web 3D and AR/VR, used by Three.js, Babylon.js, model-viewer, and e-commerce previews for self-contained, reliable distribution. GLB supports PBR materials, skeletal animations, Draco and Meshopt compression, suitable for web, AR, and cross-software use. However, it loses CAD parametric history when tessellated from STEP or native CAD. For 3D printing, use STL or 3MF as slicers cannot import GLB.

Notes:

  • Some 3D printing slicers cannot directly import GLB files
  • Not suitable for CAD parametric editing

Supported Features:

  • Single self-contained binary file
  • PBR material support (base color, metallic, roughness, normal maps)
  • Skeletal animation, skinning, and morph targets
  • Draco mesh compression and KTX2 texture compression
  • Multi-mesh nodes and scene hierarchy

Output format

Extension:
stl
Full Name:
Stereolithography
Type:
3D Mesh
Format:
STL (Binary / ASCII)
Tools:
Cura、PrusaSlicer、Chitubox、Simplify3D
Open With:
Slicer Software、MeshLab、Windows 3D Viewer、STL Viewer Online
Description:
STL is the de facto standard mesh format in 3D printing, storing only triangular surface data since 1987, without color, texture, or material. Almost all slicers (Cura, PrusaSlicer, Bambu Studio, ChiTuBox) and printers directly support STL, ensuring its enduring popularity. Two classic pitfalls: STL lacks unit definitions, making millimeters and inches indistinguishable on disk; always verify scale in your slicer. It also has ASCII (readable but 4-6x larger) and binary (compact, default) encodings. For multi-color printing, materials, or parameters, switch to 3MF, which carries richer print information while maintaining slicer compatibility.

Notes:

  • Does not support colors, textures or materials
  • No unit definition; verify scale in your slicer
  • ASCII format is 4-6× larger than binary

Supported Features:

  • Triangle mesh only, simple and universally compatible
  • Binary and ASCII encoding options
  • Directly importable into Cura, PrusaSlicer, Chitubox, etc.

How to Use

1

Import GLB Scene

Load your web 3D model containing single or multi-part geometries.

2

Choose Binary Format

Select Binary STL for optimal slicer compatibility and smaller export size.

3

Check Coordinate Alignment

Match the coordinate system (Y-Up or Z-Up) with your 3D printer bed convention.

4

Export Watertight STL

Download merged single STL geometry ready for 3D slicing software.

Frequently Asked Questions

View all FAQs
Q

What happens to colors and textures?

A

They are not kept. STL does not support colors, so color and texture data are stripped. STL only stores triangular geometry, which is enough for most 3D printing workflows. If you need color printing, use 3MF instead.

Q

What about animations?

A

STL does not support animation data. Only static geometry is exported, so an animated model is converted in its default pose. To preserve animation, use GLB or FBX.

Q

What units does the output use?

A

The output keeps the units from the source GLB. STL files do not store unit information, and most slicers assume millimeters. If the model size looks wrong, scale it in the slicer.

Q

Will multiple objects in my GLB be merged into one STL?

A

Yes. The glb-to-stl conversion merges all meshes into a single STL file. If you need separate objects for printing or assembly, export each mesh individually from the GLB source before converting.

Q

Can the converted STL be used for CNC machining?

A

Yes. STL is a common input format for CNC and CAM workflows. Since the tool exports pure geometry, you can load the STL into CAM software and generate toolpaths just like any other STL.

Q

The converted model looks faceted. Is that normal?

A

Yes. STL represents surfaces with flat triangles, so curved areas can look faceted up close. Smoothness depends on the mesh density of the source GLB; a denser mesh produces a smoother result.

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