gCAD3D for PC: Download & Install on Windows (2026)

Most 3D CAD programs are either expensive commercial packages or heavyweight suites that take an afternoon to set up. gCAD3D takes the opposite approach: it is a small, free CADCAM program you can download in minutes. This gcad3d download for pc guide walks you through the official download, the Windows install, and your first model.

One fact belongs up front, stated plainly: gCAD3D is completely free GPL software, but the newest Windows installer on the official server is the older 2.50.00 32-bit build from 2022, while Linux carries the current release. This guide points you to that genuine Windows file.

What Is gCAD3D?

gCAD3D is a free, open-source 3D CAD/CAM program developed by Ing. Franz Reiter of CADCAM-Services Franz Reiter in Vienna, Austria, with contributors including Dr. Thomas Backmeister on mathematical functions and splines and Dipl.Ing. Karl Sauer on geometric functions. The project was renamed gCAD3D in 1999 and ported to MS-Windows in 2003.

It works as a parametric 3D CAD program with its own import and export programs for formats such as STEP, IGES, VRML, DXF, SVG and OBJ, so models can move between gCAD3D and other design tools. An integrated 3D OpenGL viewer displays your work, and 2D draftings, 3D models and bitmaps can all be shown together in the same 3D model space. Objects can also carry interactions, such as calling other models or programs or changing the viewport or dimensions.

Beyond modelling, gCAD3D includes a program interpreter for geometry and NC commands in 3D and an integrated NC processor for CNC work. Geometry and NC programs can be created interactively, by manual commands, by importing STEP, IGES or DXF files, by mockup import from VRML-1 or OBJ files, or from data files, then output through DXF, IGES or STEP export, a standard ISO postprocessor, or the native APT3D format.

Key Features

Parametric 3D CAD: Build and edit 3D models parametrically, with geometry that can also be driven by manual commands.
Wide import and export: Built-in import/export programs handle STEP, IGES, VRML, DXF, SVG and OBJ files.
Integrated 3D OpenGL viewer: Inspect models, 2D draftings and bitmaps together in one 3D model space.
NC processor for CNC: An integrated NC processor and a program interpreter handle geometry and NC commands in 3D.
Interactive object actions: Objects can carry interactions that call models or programs, or change the viewport or dimensions.
Plugins and RemoteControl: A programming interface supports user programs (plugins) and remote control of the application.
Free GPL software: Released under GPL-3, with source code available on GitHub and no licence key or paid edition.

System Requirements

Operating System: Windows 10 or Windows 11 (the official Windows build is 32-bit and runs on modern Windows)
Processor: Any modern Intel or AMD processor is fine for this lightweight program
RAM: No official minimum is published; everyday amounts in a current PC are sufficient
Storage: The official Windows installer is about 10 MB; leave extra room for models and project files
Graphics: A display with OpenGL support for the integrated 3D viewer
Prerequisites: None — gCAD3D comes with all necessary GTK runtime libraries included
Internet: Only needed for the download itself

How to Download gCAD3D (Official Method)

Because gCAD3D is free at the source, there is never a reason to take it from a third-party download site, where old or repackaged copies are common. The official homepage at gcad3d.org hosts the downloads itself, including the Windows installer on the official server. The homepage Downloads table currently lists the Linux package and source code, so Windows readers should use the official Windows installer file described below rather than looking for a newer Windows build that is not there.

Official Website: Download gCAD3D from the official website

Step-by-Step Installation

Open the official gCAD3D website linked above.
Go to the Downloads section of the homepage.
Download the Windows installer file gCAD3D-2.50.00-win32.exe from the official server — this is the newest Windows installer hosted there.
Save the installer file to your Downloads folder.
Double-click the installer and approve the Windows permission prompt.
Follow the setup wizard; the 32-bit program installs under Program Files (x86), and no extra runtime libraries are needed because the GTK libraries are bundled.
Launch gCAD3D from the Start menu once setup finishes.

Tip: If you also use Linux, the current 2.60.x release is available there as a Debian 64-bit package from the same homepage, and the full source code is on the official GitHub repository for anyone who prefers to build it themselves.

How to Create Your First Model in gCAD3D

Launch gCAD3D and start a new model in the 3D model space.
Create basic geometry interactively by placing points, lines and simple shapes, or type geometry commands manually.
Check your work in the integrated 3D OpenGL viewer, rotating the view to confirm the shape looks right from every side.
Alternatively, import an existing STEP, IGES or DXF file and continue editing it instead of starting from a blank space.
Add a 2D drafting or a bitmap reference into the same model space if your project needs dimensions or a visual guide alongside the model.
Save your work, then export a copy in STEP, IGES or DXF format when you need to share the model with another CAD program.

Is gCAD3D Really Free? The Honest Picture

Yes. gCAD3D is free software under GPL-3: you can redistribute it and modify it under the terms of the GNU General Public License, and there is no paid edition, no licence key and no activation step. The full source code is published on GitHub.

The honest caveat is the Windows version, and it is worth stating exactly. The newest Windows installer hosted on the official server is version 2.50.00, a 32-bit build dated November 2022. The current 2.60.x series is presently offered for Linux, as a Debian package, plus source code, with no Windows build. The 32-bit Windows build still runs on Windows 10 and 11 and needs no extra prerequisites, but Windows users should expect the 2022 feature set rather than the newest Linux release. The official documentation also notes a real modelling limit: gCAD3D cannot yet create or modify complex solid bodies, so it suits geometry, drafting and NC-oriented work better than advanced solid modelling.

Frequently Asked Questions

Is gCAD3D safe to download?

Yes, from the official website linked above. gCAD3D is developed by Franz Reiter and distributed from gcad3d.org, with the Windows installer hosted on the official server and the source code on GitHub. Copies on third-party download sites may be older versions, so the official site is the safest source.

Is gCAD3D really free?

Yes, completely. It is free software under the GPL-3 licence, with no paid edition, no licence key and no trial period. You can use it, redistribute it and modify it under the licence terms.

Which gCAD3D version can Windows users download?

The newest Windows installer on the official server is the 2.50.00 32-bit build from 2022, and that is the file this guide uses. The newer 2.60.x series is currently available for Linux and as source code, not as an official Windows installer.

Which file formats does gCAD3D support?

It has its own import and export programs for STEP, IGES, VRML, DXF, SVG and OBJ, plus NC output via a standard ISO postprocessor or the native APT3D format.

Conclusion

gCAD3D is a long-running, genuinely free CADCAM program with parametric modelling, broad format support, an OpenGL viewer and integrated NC tools. Windows users get the stable 2.50.00 32-bit build from the official site — older than the Linux release, but complete, licence-free and ready to run on Windows 10 or 11.

Download gCAD3D from the Official Website

gCAD3D for PC: Download & Install on Windows (2026)