Free STEP to GLB converter
Convert STEP to GLB for the web, AR and Blender.
GLB is the format of web 3D viewers, AR Quick Look pipelines, three.js and model-viewer. Drop a STEP file and Caddis writes a validated GLB, already scaled to metres and turned Y-up as glTF expects.
Why convert STEP to GLB?
Showing a product in 3D on a website or in AR means getting CAD data into glTF. Most converters are paid desktop apps or upload sites. This one runs in your browser.
How to convert STEP to GLB
- Choose your STEP or STP file above, or drag it onto the box.
- Check that GLB is selected. You can switch to any other output.
- Select Convert. The file downloads straight away. Nothing is uploaded.
Good to know
- CAD is usually Z-up in millimetres. The GLB applies the rotation and the scale to metres in its root node, so the model stands upright at real size.
- Faces are flat-shaded, which suits machined parts. Add normals in Blender if you want smooth shading.
- Output passes the Khronos glTF Validator with no errors.
What converts, and what doesn't
- Every output is a triangle mesh. STEP and IFC solids are tessellated for display, so the result is not an editable solid or B-rep.
- When the source names its parts (STEP and IFC assemblies, for example), they become named groups in OBJ. STL, PLY and GLB hold a single combined mesh.
- Colours and materials are not carried over.
- Coordinates keep the source units, except GLB, which is scaled to metres when the source declares its units.
Frequently asked questions
Can I convert GLB to USDZ for iPhone AR?
Not here yet. Apple's Reality Converter turns GLB into USDZ for free on a Mac.
Is my file uploaded?
No. The file is read and converted by the Caddis engine running inside your browser tab. It is never sent to a server, so confidential drawings stay on your device.
Is it really free?
Yes. There's no account, watermark, page limit or daily quota. The converter runs on your own computer, so it costs us nothing per file.
Need to measure or mark up the drawing too?
The same engine powers the free Caddis viewer on the web and on iPhone. Open DWG, DXF, STEP and STL files, measure, and add markup, all on your device.
More free CAD tools
Universal CAD converterDWG version checkerDWG to DXFDWG to PDFDWG to SVGDWG to PNGDXF to PDFDXF to SVGDXF to PNGDXF to R12 DXFSTEP to STLSTEP to OBJSTL to OBJOBJ to STLSTL to GLBPLY to STLIFC to OBJIFC to GLBSLDPRT to STL