Convert OBJ 3D models to binary STL locally - ready for 3D printing and any slicer. No upload.
Running locally on your device ...
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
OBJ (Wavefront) is a common 3D exchange format from programs like Blender, Cinema 4D or MeshLab. For 3D printing, however, slicers such as Cura, PrusaSlicer or Bambu Studio usually expect STL - the plain triangle shell of a model. This tool reads your OBJ and writes a compact binary STL you can load straight into the slicer.
Faces with more than three corners (quads or larger polygons) are split into triangles during conversion, since STL knows only triangles. For each triangle the face normal is additionally computed and written out. The result is binary STL, because it is markedly smaller than the text variant and is read by every slicer.
Everything runs entirely locally in the browser - your possibly confidential model never leaves your device. Honestly framed: pure geometry is transferred. OBJ material (MTL), textures, texture coordinates and groups have no counterpart in STL and are not carried over. An invalid or empty OBJ file is rejected with a clear message.
| Input formats | OBJ |
|---|---|
| Auto-conversion | PNG, JPG, WebP, GIF, BMP, TIFF, ICO, SVG, HEIC, PDF, MP3, WAV, DOCX, MIDI, DDS, HDR, PCX, WBMP |
| Output format | STL |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Converts OBJ to compact binary STL: quads and larger polygons are split into triangles, and a normal is computed per triangle. The conversion is geometrically lossless except for a technical rounding: coordinates are stored as 32-bit floating-point numbers in the binary STL format, with no noticeable difference for typical models. Pure geometry is transferred - OBJ material (MTL), textures and groups have no counterpart in STL. An invalid or empty OBJ file is rejected with a clear error.
The tool writes binary STL because it is markedly smaller and read by every slicer. If you need text, use the reverse direction via STL ASCII to binary.
Yes. Quads and larger polygons are automatically split into triangles, since STL knows only triangles.
No. STL stores geometry only; material (MTL), textures and texture coordinates have no counterpart there.
No, the conversion happens entirely locally in the browser; your model never leaves your device.
STL to OBJ · STL ASCII to binary · STL binary to ASCII · PLY to STL · OBJ to PLY · PLY to OBJ