Convert STL 3D models to the OBJ format locally - for Blender, Cinema 4D and 3D tools. No upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
STL is the standard format of 3D printing: a plain triangle shell with no further structure. OBJ (Wavefront), by contrast, is the common exchange format for 3D programs such as Blender, Cinema 4D, Maya or MeshLab and stores the geometry as a shared vertex pool with faces that reference it. If you want to edit a printed or scanned model further, you often need it as OBJ. This tool reads your STL and writes a clean OBJ file.
Both binary and text-based (ASCII) STL are recognised - the tool detects the type automatically. During conversion the vertices that STL stores many times over are merged (welded) into a shared pool, so the OBJ file is more compact and cleaner than the raw triangle soup. The number of triangles is preserved exactly and the coordinates are carried over unchanged.
Everything runs entirely locally in the browser - your possibly confidential model never leaves your device. Honestly framed: pure geometry is transferred. STL knows neither material, texture, colour nor groups, so the OBJ contains only vertices and faces - no companion MTL file. A broken or empty file is rejected with a clear message instead of faking a meaningless output.
| Input formats | STL |
|---|---|
| Output format | OBJ |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Converts binary and ASCII STL to an OBJ file: duplicate vertices are welded, the triangle count is preserved exactly and coordinates stay unchanged. Pure geometry is transferred - STL carries no material, texture or colour, so no MTL file is produced. An invalid or empty STL file is rejected with a clear error.
Yes. The tool detects the STL type automatically and reads both variants.
Yes. The triangle count stays the same and the coordinates are carried over unchanged; duplicate vertices are merely merged into a pool.
No. STL carries no material or colour information, so the OBJ contains only geometry and there is no MTL file.
No, the conversion happens entirely locally in the browser; your model never leaves your device.