My OBJ has several parts — does the STL keep them?

Yes: all geometry from every group in the OBJ goes into the same STL. Note STL doesn't distinguish objects — if you need to print them separately, split the model before converting.

Why does my OBJ show textures but the STL looks 'gray'?

Because STL can't store textures or materials: it's a pure-geometry format built for manufacturing. The shape is exactly the same; only the appearance is lost, which doesn't matter for single-color printing.

Is the resulting STL slicer-ready?

The geometry converts as-is: if the OBJ was a closed mesh, the STL goes straight into Cura, PrusaSlicer or Bambu Studio. If the source had holes (common in game models), run it through the mesh repair tool before printing.

No file handy?

Convert toSTL

Coordinates and scale are preserved exactly as they are.

Convert OBJ to STL

Drop your OBJ files and download them as STL: free, in batch, and they never leave your device.

OBJ → STL: what you should know

Converting OBJ to STL is the last step before printing: models downloaded from Sketchfab, sculpted in Blender or exported from a DCC usually come as OBJ, and while many modern slicers accept it, STL remains the universal format every print service, marketplace and machine understands.

The converter takes the OBJ's geometry — including all its groups and objects — and writes it as a compact binary STL, without rescaling or moving anything. The whole process runs in your browser: models with restrictive licenses or your own designs never leave your machine.

Keep in mind what STL drops by design: the OBJ's materials, textures and colors don't travel into the STL, because the format only stores triangles. For single-color printing that's irrelevant; if you print multicolor and the model has vertex colors, consider converting to PLY or 3MF from the source.

Related conversions

PLY → STL OBJ → PLY OBJ → GLB OBJ → USDZ OBJ → 3MF glTF → STL GLB → STL 3MF → STL

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