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.
Frequently asked questions
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.
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