Convert STL to OBJ in your browser
STL is documented in both its ASCII and binary forms, so this page reads either one on your machine and writes a Wavefront OBJ. Useful when a print-ready mesh has to go into a renderer or CAD package that will not take STL.
Short answer: Drop your STL file below and it converts to OBJ inside your browser — free, no sign-up, and the file is never uploaded.
| Converts in this browser | Yes |
|---|---|
| Cost | Free |
| From | STL — Stereolithography mesh |
| To | OBJ — Wavefront OBJ |
| Steps | 4 |
STL → OBJ converter
Runs entirely in this browser tab. Your file is never uploaded and nothing is stored.
Drop your STL file here
or — no sign-up required
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How it works
- 1Drop the .stl file above — binary and ASCII STL are both detected automatically.
- 2Download the .obj and import it with the units you know the original used.
- 3In a renderer, assign a material after import: STL had none to carry across.
- 4For CAD documentation, convert onwards to DXF so the mesh arrives as 3DFACE entities.
What to watch out for
- Vertices are not welded. STL repeats every corner per triangle, so the OBJ has duplicate vertices — run a merge-by-distance in Blender or MeshLab if that matters.
- Large binary STLs (millions of triangles) are slow in a browser tab; a desktop tool is faster past roughly 2 million facets.
- No colours or materials exist in standard STL, so none appear in the OBJ.
The triangle-soup format every 3D printer and mesh tool reads. Openly documented in both ASCII and binary form, with no units, colours or structure.
A plain-text mesh format listing vertices and faces — openly documented, which is why it can be read and rewritten in the browser.
Questions
Will the OBJ be a solid I can machine from?
No. Both formats store surface triangles. For a true solid you need STEP or Parasolid out of the originating CAD package.
Can it read colour STL variants?
The colour extensions some slicers write are non-standard and are ignored here; only geometry is converted.
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