Free FBX to STL Converter

How to convert FBX to STL

Step 1. Drop your FBX file on the converter above, or choose it from your device. If the model comes with other files, such as pictures, a .bin, or a .mtl, choose them in the same go.

Step 2. Look at the preview. If the model lies on its side, change the up direction to match your file.

Step 3. Check the unit. An FBX states its unit in its settings, and the converter reads it. If the file sets none, it is read as centimeters, which is what FBX assumes. You can change it. Choose the unit your model was made in, and the STL file is scaled to millimeters. The size next to the download button changes with it.

Step 4. Press the download button. The STL file is saved to your device, named like your original with .stl at the end.

Printing a character or prop from an FBX

Game assets and character models often start as FBX, and people print them as figures, props, and cosplay parts. A slicer reads STL, which holds shapes only. The converter writes the model in its first pose, stood upright with Z up.

The converter reads the unit the FBX states, and assumes centimeters, the FBX default, when it states none. The STL will be read as millimeters, so check the unit and change it if your model was made in another. Game models are often in centimeters. Then check the size shown next to the download button. Posed characters can have thin parts, loose pieces, or parts that overlap. Slicers can merge overlapping pieces, but look at the print preview.

What survives the conversion

Shapes. Every mesh in the file is read. Shapes are written as triangles in a binary STL.

Colors and materials. Basic colors are read. Complex shader setups are simplified. Colors are not kept.

Textures. Pictures embedded in the FBX are read, and so are pictures you pick together with it. Textures are not kept.

Animation. Animation clips are read. Animation is not kept, so the model is saved in its first pose.

Units and direction. An FBX states its unit in its settings, and the converter reads it. If the file sets none, it is read as centimeters, which is what FBX assumes. You can change it. The file is written in millimeters with Z pointing up, which is what slicers expect. A model with several parts is saved as one file.

If something looks wrong

Very old FBX versions may not open. Export the file again with a newer FBX version.

Clothing and accessories that are separate meshes are saved in the same STL. Remove what you do not want to print before you export from your 3D app.

Check the size shown before you print. A part that is 1000 times too big or too small usually means the unit was wrong.

The converter does not repair holes. A printer needs a closed shape, so check the file in your slicer.

If your browser cannot draw 3D, there is no preview, but the conversion still works.

Your file stays on your device

The converter reads your FBX file in the browser and writes the STL file there too. Nothing is uploaded, and the page does not load anything the file points to, other than files you choose yourself. The page counts a visit like any other page, but it never sees the file's name or contents.