Kept
- Triangle geometry
- Shape and dimensions as stored in the file
- Multiple shells in a single OBJ
Runs locally · no upload
Convert STL to OBJ
Turn a binary or ASCII STL into a Wavefront OBJ file. The triangulated surface is kept as-is; STL carries no material, so the OBJ contains geometry only.
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- 5 credits per file
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Drop a 3D file hereSTL, OBJ, PLY, GLB, glTF, 3MF or STEP · up to 100 MB · processed locallyYour file never leaves this browser.
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What changes in the conversion
Dropped
- Nothing to drop: STL has no materials, colours or UVs
- Units are still ambiguous after conversion
Common mistakes
- An ASCII STL with broken facet syntax may fail to parse; repair it in a mesh editor first.
- STL has no units: an OBJ imported in Blender, Unity or CAD may need scaling.
- Very dense meshes (millions of triangles) can freeze the tab; the tool refuses files above 100 MB.
For 3D printing
- OBJ is not read by every slicer: most accept STL directly, so convert only if your pipeline needs OBJ.
- Check the bounding box in your software; the dimensions are unchanged but the unit is still implicit.
Drop the file — it is read locally, never uploaded.
Choose the options, then convert or compress.
Download the result and open it in your slicer or 3D software.
Frequently asked questions
Does STL to OBJ keep the materials?+
STL has no materials at all. The OBJ keeps the geometry and nothing else; add a material in your 3D software if needed.
Is the conversion lossless?+
The triangles are preserved, but OBJ stores shared vertices and STL duplicates them. The shape is identical, the file organisation differs.
Can I convert a 50 MB STL?+
Yes, up to 100 MB. Parsing happens in your browser and may take a few seconds on a laptop.
Need a model instead of a conversion?
Turn a photo, a drawing or a logo into a 3D model, then export it in the format you need.