Convert STL to OBJ

Good to know

The result is one OBJ group, in the same units as the STL. Most 3D apps treat OBJ as Y-up, so the model is turned to stand upright there too.

How it works

1. 1Drop your STL file in the box above. It is read in your browser.
2. 2Check the preview and the size. If the STL came in meters or inches, set the scale.
3. 3Download the OBJ. It opens in Blender, Maya, and 3ds Max.

What carries over

Shape

Kept

Colors

Dropped

Materials

Dropped

Units

Dropped

Separate parts

Dropped

Exact curves

Dropped

About STL

STL (Stereolithography). The default 3D printing format since 1987: a bare list of triangles. Every slicer reads it, but it has no units, no color, and no parts.

Units: None in the file. Slicers read the numbers as millimeters. Up axis: Z. Opens in Bambu Studio, PrusaSlicer, Cura, OrcaSlicer, and Blender.

About OBJ

OBJ (Wavefront OBJ). A plain-text mesh format from Wavefront. Common in 3D art, scans, and game assets. Materials live in a separate .mtl file.

Units: None in the file. Usually meters or centimeters from 3D apps. Up axis: Y. Opens in Blender, Maya, 3ds Max, Cinema 4D, and most slicers.

Questions

Is the STL to OBJ converter free?

Yes. You get 3 runs a month without an account. Sign in with your email, free, and there is no limit.

Is my file uploaded?

No. The file is read and converted in your browser. It never reaches our servers.

Will the OBJ keep colors and materials?

Where the STL has them, yes.

What units is the OBJ in?

STL: None in the file. Slicers read the numbers as millimeters. OBJ: None in the file. Usually meters or centimeters from 3D apps. The converter does not guess. Use the scale option if the size looks wrong.

How do I open an OBJ file?

Blender, Maya, 3ds Max, Cinema 4D, and most slicers all open OBJ.