3D-Tool Free Viewer

View CAD data free of charge

intuitive & practical 3D without CAD expertise
affordable & universal many 3D/2D interfaces

Free CAD Viewer for teamwork and publishing

With the free 3D-Tool Free Viewer, you can open 3D-Tool models in DDD format as well as STL and 3MF files for viewing, inspection, measurement and analysis – free of charge, including for businesses.


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and try it free

Free 3D CAD viewer for DDD, STL and 3MF files

3D-Tool Free Viewer - free 3D Viewer

Visualize DDD, STL and 3MF files professionally

The Free Viewer is not a trial version, but permanently free software with many 3D-Tool measurement functions and analysis tools. The intuitive operation makes it easier for everyone to evaluate 3D designs and speeds up collaboration.

In addition to 3D-Tool DDD files, the Free Viewer also opens 3MF and STL files. This makes it an efficient, free tool for 3D printing, rapid prototyping and quick inspection of 3D models.

The Free Viewer runs on any Windows PC. The compact installer requires no registration. Installation is straightforward and usually possible without admin rights. Use is free – with no advertising and no time limit.

Download the Free Viewer

Screenshot of the 3D-Tool Free Viewer user interface. The loaded 3D model has been exploded, dimensioned, and analyzed for wall thickness.
The 3D-Tool Free Viewer is a free and easy-to-use CAD viewer for 3D-Tool DDD, 3MF, and STL files. A wide range of measurement and analysis functions sets it apart from other free 3D viewers.
Poster of screenshot and software box as a symbol for the trial version of the 3D-Tool Viewer and Converter
Downloading the trial version of the 3D-Tool Viewer and requesting the 14-day license key is simple, fast, free and without obligation.

Test CATIA, SolidWorks, Siemens NX, Creo, Autodesk, X_T, STEP and more

A licensed version of the 3D-Tool Viewer is required to create DDD files. After installation, you can request a free trial key:

  • The trial key activates all functions and import formats, including CATIA, SolidWorks, Siemens NX, I-DEAS, Creo, Inventor, Solid Edge, Navisworks, Rhino, JT, X_T, STEP, IGES, VDA and SAT.
  • The trial key activates conversion of these CAD formats to STEP, IGES, JT, SAT and X_T.
  • The trial key activates publishing in the 3D-Tool DDD format, as 3D-PDF and as an HTML page.
  • The trial key activates saving to many 3D visualization formats, including 3DS, 3MF, OBJ, PLY, FBX and glTF.

Test all formats with the trial key

Publish CATIA, SolidWorks, Siemens NX, Creo and Autodesk

With a Premium license, 3D-Tool opens a wide range of CAD files: native formats from many CAD programs, 3D exchange formats such as JT, STEP and IGES, and 2D formats such as DWG and DXF.

All models and drawings can be published directly or with annotations and dimensions. This is how 3D-Tool becomes a universal tool for coordination, control and documentation - from development to sales.

Publish your designs as:

  • DDD files for the 3D-Tool Free Viewer
  • 3D-PDF for Acrobat Reader
  • HTML pages for modern browsers
  • JT files for the free JT2Go
Schematic representation of the publishing options of the 3D-Tool Viewer
With a Premium license, you can publish your 3D models in different formats that can then be viewed with free 3D viewing options.

Frequently Asked Questions (FAQ)

Is the 3D-Tool Free Viewer really free?

Yes. The Free Viewer is permanently free software - not a trial version. There are no ads and no time limit. The Free Viewer offers extensive functions for opening, viewing, measuring and analyzing 3D CAD models and 2D drawings.

Which file formats can the Free Viewer open?

The Free Viewer opens 3D-Tool DDD files as well as STL and 3MF files. This makes it a practical, free tool for inspecting published models and for 3D printing and rapid prototyping.

Do I need to register or have admin rights to install the Free Viewer?

No. The compact installer requires no registration and runs on any Windows PC - usually without admin rights. Installation is quick and straightforward.

What can I do with the Free Viewer?

You can view, rotate and measure models, create cross-sections and exploded views, show and hide individual components, create dimensions and annotations, and analyze models - all by point and click and without CAD expertise.

How do I create DDD files that others can open in the Free Viewer?

DDD files are created with a licensed 3D-Tool Viewer. After installation, you can request a free trial key that unlocks all import formats (CATIA, Siemens NX, Creo, SolidWorks, STEP, JT and more) and enables publishing as DDD, 3D-PDF and HTML.