OBJ to STL, ready for your slicer.
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This converter turns an OBJ mesh into STL, the standard format for 3D printing. Non-triangular faces are triangulated automatically, and materials or textures are dropped so the output matches the STL spec. Every step runs locally in your browser, so your files are never uploaded.
| Option | What it does | Default / range |
|---|---|---|
Up axis | Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.
| Z-up |
Rotation X | Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Y | Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Z | Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Application | Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.
| Root node transform |
| Option | What it does | Default / range |
|---|---|---|
Binary Format | Choose the STL storage format. Both formats produce identical print results.
| Binary STL |
Split Multiple Parts | Export independent meshes as separate STL files packaged in a ZIP archive. | off |
stl|Open With: Slicer Software、MeshLab、Windows 3D Viewer、STL Viewer Online
Multiple meshes are usually merged into a single STL. Their relative positions are preserved, but the parts are no longer separate bodies. If you need separate files, split the objects in your modeling software first.
Non-triangular faces are triangulated automatically before export. STL only supports triangles, so quads and polygons are split into triangles. The overall shape of the model stays exactly the same.
No. STL has no material support, so colors, textures, and UV data are discarded. STL stores only triangle geometry, which is all a slicer needs. Use 3MF if you must keep color information.
OBJ stores normals per vertex, while STL only supports per-facet normals. During conversion, facet normals are computed automatically from the triangle geometry, so custom vertex normals from the OBJ file are not preserved.
STL is the de facto standard for 3D printing: virtually every slicer, printer software, and print service accepts it, and it carries a clean triangle mesh ready for slicing. Converting OBJ to STL is the most reliable way to get a model into a printing workflow.
UV coordinates are texture-mapping data, and STL has no texture or material support, so they are discarded together with the materials. Only triangle geometry is exported, and that is exactly what 3D printing needs.
