Processed on your device — never uploaded

OBJ to STL Converter

Turn OBJ models from Blender, Maya or any modeling tool into the binary STL your slicer expects. Quads and polygons are triangulated automatically — locally, never uploaded.

Drop your .obj file here or click to browse Tap to choose a file
Polygons auto-triangulated · binary STL output · processed locally

From modeling software to the printer

OBJ is what modeling tools speak; STL is what 3D printing understands. Slicers like Cura, PrusaSlicer and Bambu Studio all accept STL as their native input, so the last step before printing a model you sculpted — or downloaded in OBJ — is usually this exact conversion.

The two formats think differently: OBJ can contain quads and arbitrary polygons, while STL only knows triangles. This converter triangulates every face automatically (fan triangulation), so models with mixed quad/polygon geometry come out as valid, watertight-preserving triangle meshes. Materials, textures and UV coordinates are dropped — STL has no place for them, and the printer doesn't need them.

The output is binary STL — compact and universally accepted. And as with every LocalConvert tool, your model is converted on your own device: paid models and client work never touch a server.

Frequently asked questions

Are textures and colors converted?
No — standard STL stores pure geometry only. Slicers ignore textures anyway; color 3D printing uses different formats (3MF, OBJ+MTL directly).
My OBJ has quads — is that a problem?
No. Quads and larger polygons are split into triangles automatically during conversion.
Binary or ASCII STL?
Binary — it's several times smaller and every slicer accepts it.

Related tools

.stl → .objSTL to OBJ sha-256File Hash Checker