What Is a .jt File? .jt Format, MIME & How to Open

Quick facts

Extension.jt

File typeJT 3D Model

MIME typemodel/jt

Category3D Model

Charset—

Compressible—

What is .jt

What is a .jt file?

A .jt file is a JT 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/jt. When serving .jt over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to model/jt — and is delivered over HTTP via the Content-Type header.

How to open .jt files

Use Blender or MeshLab to open and edit .jt files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: model/jt

Common software that reads/writes .jt:

BlenderMeshLabAutodesk Viewer

Relation chain

.jtextension of

format

JT 3D Modelserved as

mime type

model/jtsent via header

http header

Related extensions

Related MIME types

Common uses

3D printing
Game assets
CAD and design exchange

How to edit .jt files

Open the file with Blender, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .jt files

Create a new file and save it with the .jt extension, or export this format from Blender.

Frequently asked questions

What programs can open .jt files?

Common options include Blender, MeshLab, Autodesk Viewer. You can also open many of these files with built-in viewers or a browser.

How do I create a .jt file?

Create a new file in any text editor or the app that owns the format and save it with the .jt extension.

What is the relationship between .jt and the model/jt MIME type?

model/jt is the media type identifier used for .jt files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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