U3D 3D Model — A .u3d file is a U3D 3D Model. It is a 3D model format used to store meshes, scenes and printing geometry.
Quick facts
What is .u3d
A .u3d file is a U3D 3D Model. It is a 3D model format used to store meshes, scenes and printing geometry.
In the mime-db registry it maps to model/u3d. When serving .u3d over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to model/u3d — and is delivered over HTTP via the Content-Type header.
How to open .u3d files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: model/u3d
Common software that reads/writes .u3d:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .u3d files
How to create .u3d files
Frequently asked questions
Common options include Blender, MeshLab, Autodesk Viewer. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .u3d extension.
model/u3d is the media type identifier used for .u3d files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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