Free STL to OBJ converter
Convert STL to OBJ in seconds.
Drop a binary or ASCII STL and download an OBJ for Blender, Maya, ZBrush, Unity or any 3D tool. Duplicate corners are welded into shared vertices, so the OBJ is usually smaller than the STL.
Why convert STL to OBJ?
STL stores every triangle separately, which is fine for slicers but awkward for modelling, sculpting and rendering tools that work with connected meshes. OBJ is the universal format those tools import.
How to convert STL to OBJ
- Choose your STL file above, or drag it onto the box.
- Check that OBJ is selected. You can switch to any other output.
- Select Convert. The file downloads straight away. Nothing is uploaded.
Good to know
- Vertices are welded exactly (no tolerance), so the mesh topology is preserved and nothing moves.
- STL has no units. Most STL files are in millimetres.
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
Does it handle ASCII STL?
Yes, both binary and ASCII STL.
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.
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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 OBJSTEP to GLBOBJ to STLSTL to GLBPLY to STLIFC to OBJIFC to GLBSLDPRT to STL