What is a .U3D file?
U3D is a 3D format designed to embed interactive models inside PDFs.
- Did you know
- U3D, standardised as ECMA-363, is what lets a PDF hold a spinnable 3D model.
- U3D was defined by the 3D Industry Forum, a consortium including Intel, Boeing, HP, Adobe and Bentley Systems.
- U3D supports progressive streaming and continuous level-of-detail, so a model can refine itself as more of the file loads.
- What Analyser reads
- Identify more 3D, CAD and scene files: Google Draco compressed meshes, Gaussian splats (KSplat), Universal 3D, Dassault 3DXML, DirectX .x models, Qubicle voxels, Wings3D, Autodesk Revit (RVT/RFA and templates, build version from BasicFileInfo), Siemens Solid Edge, Navisworks, legacy CATIA V4, terrestrial-scanner point clouds (FARO/Trimble) and legacy binary Visio (.vsd).
- Depth of analysis
- .U3D is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .U3D file
- Drag a .U3D file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.