Free Online Converter
Convert FBX to STL
Drop a .fbx file and download a slicer-ready STL in seconds. Turns an Autodesk FBX model into clean mesh geometry for 3D printing. Runs entirely in your browser — no upload, no signup, no watermark.
How to convert FBX to STL
- Drag your
.fbxfile into the box above (or click to browse). - Preview the model in the viewer — drag to rotate, scroll to zoom.
- Click Convert & Download .stl. The
.stlfile lands in your downloads folder.
Conversion runs in your browser via three.js. Your file never leaves your device — there's no upload, no server, and nothing is stored.
Converting an FBX file to STL
FBX (Autodesk) is a game- and film-pipeline format that bundles meshes, materials, textures, rigs and animation. STL is the universal 3D-printing format: a single, geometry-only mesh every slicer reads. Converting FBX to STL is how you take a model made for games or animation and get it ready for the print bed.
This converter reads the geometry from your FBX with three.js and writes a standard STL. Because STL holds shape and nothing else, materials, textures, bones and animation are dropped — the printer needs the mesh, not the rig. The geometry itself is preserved exactly.
Two things to check before printing, since FBX models usually come from outside the print world: scale (FBX carries its own units, often centimeters, while slicers assume millimeters — rescale if it imports wrong), and watertightness (game and animation meshes aren't always solid). Preview here, then use STL Repair if your slicer complains.
Frequently asked questions
How do I convert an FBX file to STL?+
Drop your .fbx file into the box above, preview it in the 3D viewer, then click Convert & Download .stl. Everything runs in your browser — the file is never uploaded.
Is this FBX to STL converter free?+
Yes. No signup, no watermark, and no file-size paywall. Flip3D reads and converts your FBX locally on your own device.
Does it keep materials, textures and rigging?+
No. STL stores geometry only. An FBX's materials, textures, skeleton/rig and animation are all dropped, leaving a single clean mesh — which is exactly what a slicer needs. If you want to keep materials for rendering instead, convert FBX to GLB.
My model imports at the wrong size — why?+
It's units. STL is unitless and slicers assume millimeters, while FBX files carry their own unit scale (often centimeters). If the model comes in too small or too large, just scale it in your slicer or set the import units.
Is the STL ready to 3D print?+
The geometry is preserved exactly, but FBX models built for games or animation aren't always watertight or manifold, which slicers require. Preview it here first, and if your slicer flags holes or non-manifold edges, run it through our free STL Repair tool before printing.
Can I convert STL back to FBX here?+
Not on Flip3D — FBX is read-only here, meaning we import it but don't write it back out (valid FBX requires Autodesk's proprietary SDK). For the reverse, use Blender (free) or another desktop tool.
Does it handle large FBX files?+
Yes. Conversion runs on your own machine, so the limit is your browser's memory rather than an upload cap. Large meshes convert fine on a normal desktop.