What is the F3D file format?
Files with the .f3d extension store 3D project data created in Autodesk Fusion (formerly Autodesk Fusion 360). An .f3d file can hold a complete parametric design - including component geometry, assembly structure, and manufacturing setups - making it suitable for product tools, mechanical parts, devices, and other production designs. Autodesk Fusion is a professional CAD/CAM/CAE application available for Windows and macOS, as well as through a web browser; by default it saves active projects to Autodesk's cloud storage to facilitate collaboration, but designs can also be exported locally as .f3d archive files.
Autodesk Fusion is a dedicated tool for 3D modeling and therefore .f3d files store 3D objects and projects, including:
- CAD - Computer-Aided Design,
- CAM - Computer-Aided Manufacturing,
- CAE - Computer-Aided Engineering,
- PCB - Printed Circuit Board layout.
Autodesk Fusion is used by professionals and enthusiasts for commercial and non-commercial projects across many industries that rely on parametric 3D modeling.
The .f3d format is a proprietary binary archive; do not confuse it with .f3z, a ZIP archive-based bundle that packages one or more .f3d designs together with a JSON manifest. Autodesk Fusion allows projects to be exported to a range of 3D formats, for example .STP (STEP geometry exchange) or .FBX (Autodesk data-sharing format). This makes it possible to share designs with users of 3D CAD/CAM/CAE products from other suppliers.
Security & safety
RISK: LOWAn .f3d is passive CAD design data - it does not execute code, so opening one is safe. The only practical caveats: it requires an Autodesk account/Fusion to open, and design files can embed proprietary or confidential geometry, so treat shared .f3d files as sensitive intellectual property. There is no macro/scripting payload in the archive itself.
Format details
in a nutshellPrograms that open F3D files
Windows1 app
Autodesk Fusion
Freemium File > Open > pick the .f3d (or drag it into the Data Panel to upload). Free 'Personal Use' licence opens and edits it. 
macOS1 app
Autodesk Fusion
Freemium Install the Mac desktop app; File > Open the .f3d. Same free Personal Use option applies.
Autodesk Fusion (web app)
Freemium Sign in to Fusion in a browser, upload the .f3d to your Data Panel, and open it - no desktop install needed. Technical details
deep spec| Developer | Autodesk |
| Format type | Proprietary binary parametric CAD archive |
| MIME type | application/octet-stream |
| Magic bytes | No public fixed signature; identify by context (exported from Autodesk Fusion) |
| Parametric timeline | Stores the full feature and operation history, enabling non-destructive edits when the file is reopened in Fusion |
| Design scope | Geometry, component assemblies, bodies, sketches, construction geometry, and joint definitions |
| Manufacturing data | Embeds CAM toolpaths, machining setups, and stock definitions for CNC and additive manufacturing workflows |
| Electronics workspace | Can include PCB layouts and electronic schematics from Fusion's integrated electronics workspace |
| Simulation setups | May carry static stress, thermal, and modal simulation setups defined in Fusion's simulation workspace |
| Appearance data | Stores material appearances and visual properties for rendering inside Autodesk Fusion |
| Cloud snapshot | A local .f3d export is a point-in-time snapshot; live version history is managed by Autodesk's cloud |
| Export targets | Fusion can convert .f3d geometry to STEP, IGES, STL, OBJ, DXF, FBX, DWG, and other formats |
| Platform support | Read and written by Autodesk Fusion on Windows, macOS, and the Fusion web application |
| Related archive format | .f3z is a ZIP-based bundle that packages one or more .f3d files with a JSON manifest for consolidated sharing |
| Released | 2013 (Autodesk Fusion 360) |
| Specification | www.autodesk.com |
F3D conversions
Community Q&A
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