STL to OBJ converter

How to convert STL to OBJ

Choose an STL file, keep OBJ selected as the output format and convert. Rotate the preview to check that every expected piece is present, then download the OBJ and reopen that saved file in your destination application.

When you convert STL into OBJ, the operation changes the file representation rather than the physical shape. An STL to OBJ conversion keeps curves that were already triangulated as triangles. It does not reconstruct quads, sketches, editable CAD features or missing details.

Prepare a geometry-only OBJ for editing

Check scale before editing the OBJ

When you convert an .stl file to OBJ, a source distance of 20 remains 20 in the output coordinates. STL and OBJ workflows do not always agree on what that number means physically. If the object was intended to be 20 mm wide, set the import interpretation accordingly and measure it in the editor.

The viewer fits the model to the available space, so an object that looks the right size on screen can still have the wrong units in another application. Confirm a known dimension before adding it to an assembly or using it as a printing reference.

Will this STL to OBJ file converter restore colors?

No. A standard STL contains triangle geometry, not the material library, UV layout or texture images an OBJ workflow can use. This .stl to .obj export produces a geometry-only mesh. Assign materials and create UVs in an editor if your project needs them.

Conversion also does not automatically repair holes, merge overlapping solids or certify printability. Keep the original file and inspect topology before substantial editing.

Plan mesh edits and validate the result · Convert OBJ to .stl for a later printing handoff

Is an STL to OBJ converter download needed?

This .stl to OBJ converter is a browser tool: there is no desktop installer to download. You can convert .stl to OBJ locally after the page loads. To convert an STL file to OBJ reliably, stay within the 50 MB input and 90-second processing limits. The output limit is 1.2 million triangles; simplify exceptionally dense geometry in the source application first.

Processing limits

STEP input: 20 MB. STL, OBJ and 3MF input: 50 MB. Output is limited to 1.2 million triangles. Complex models may need simplification in the source application.

One file at a time. Processing stops after 90 seconds. Files remain in browser memory, and no conversion upload is performed. Replacing a file clears the previous result. Closing the tab releases its working data.