Convert MOL2 to FBX (Free)
Also converts STL, OBJ, GLB, PLY, USDZ, 3MF from the same file.
Runs in your browser. No upload, no signup, nothing to install.
Also from Innerscene: Circadian Lab, a free lighting calculator for room illuminance, melanopic EML, and glare.
How to convert MOL2 to FBX
- 1
Open your .mol2 file
Drag it onto the viewer above, or click "Open an MOL2 File". Files up to 200 MB open directly; the parse runs in a worker so the page stays responsive.
- 2
Click Download FBX
Once the file is open, the Download FBX button sits at the bottom right of the viewer. The Export menu in the toolbar has every other format.
- 3
Download
The .fbx is written in the browser and saved straight to your downloads folder. No queue, no email, no watermark.
What survives the conversion
A file conversion is a translation, and formats do not carry the same things. Here is exactly what moves from MOL2 into FBX, and what does not.
| Geometry | Kept | Both formats store triangle meshes, so the shape transfers directly. |
|---|---|---|
| Colors and materials | Kept | FBX carries material colors, which is at least what MOL2 stores, so the colors come across. |
| Layers and structure | Dropped | FBX is a single flat body with no layers or named parts. Everything merges into one object. If you need the structure, export to GLB, OBJ, DXF instead. |
| Units and scale | Reduced | MOL2 coordinates are in ångströms, and the export treats one ångström as one meter: a protein 50 Å across arrives 50 meters across. Scale the model on import to the size you want. |
| Lines and points | Reduced | FBX has no point-cloud primitive, so point clouds are skipped. Line work is kept, written as its own line-class geometry. |
What the FBX writer emits: Binary FBX 7.4: one flat Geometry and Model per mesh instance (connected straight to the root, not nested into a parent/child tree), one Material per material id, connected by OO Connections, in centimeters with UnitScaleFactor set to match.
The source: Tripos MOL2 (.mol2, .ml2)
A Tripos MOL2 file in ångströms: each molecule as ball and stick, elements from the SYBYL atom types and bond orders from the bond types, every atom coloured by element, a space-filling layer, and one layer per molecule of a multi-molecule file.
The target: Autodesk FBX (.fbx)
The game-engine and DCC interchange format nearly every 3-D application imports.
Opens in: Unity, Unreal Engine, Blender, Maya, 3ds Max, Cinema 4D.
Your file never leaves your computer
Both the MOL2 parser and the FBX writer are JavaScript and WebAssembly running in your own browser tab. There is no upload step, no server-side conversion queue, and no copy of your file anywhere but your machine. That matters for drawings under NDA, for client work, and for anything you would not email to a stranger.
Free to Use, No Signup
There are no accounts and no watermarks on this converter. If it saved you time, the one thing we ask is a mention: a post, a link from your blog or course page, or a reply to someone asking how to open a file.
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Hear about new formats
Occasional emails when the viewer learns a new format or gets a new tool.
Frequently asked questions
▶Is this MOL2 to FBX converter free?
Yes. No signup, no watermark, no per-file limit and no paid tier. Innerscene.
▶Is my MOL2 file uploaded anywhere?
No. The file is read with the browser file API and converted in the same tab. Nothing is sent to a server unless you explicitly click Share, which is a separate, opt-in feature.
▶Will my colors and materials survive the FBX export?
FBX carries material colors, which is at least what MOL2 stores, so the colors come across.
▶Do layers and named parts carry into the FBX file?
FBX is a single flat body with no layers or named parts. Everything merges into one object. If you need the structure, export to GLB, OBJ, DXF instead.
▶Will the FBX open at the right size?
MOL2 coordinates are in ångströms, and the export treats one ångström as one meter: a protein 50 Å across arrives 50 meters across. Scale the model on import to the size you want.
▶How large an MOL2 file can I convert?
Up to 200 MB, and the ceiling adapts to how much memory your device reports. The conversion runs on your own hardware, so a desktop with plenty of RAM will handle more than a phone.
▶Can I convert FBX back to MOL2?
Not here. We read MOL2 and write FBX, but not the reverse. the universal 3D viewer
▶Which browsers does it work in?
Chrome, Edge, Firefox and Safari, on Windows, macOS, Linux, iOS and Android. No plugin and no extension.
Convert MOL2 to something else
Convert something else to FBX
Or start from the universal 3D viewer.