If you work with 3D modeling or CAD software, you may have come across STP files. These files are commonly used for storing 3D model data and are widely used in engineering and manufacturing industries. To view and explore STP files, you need a reliable STP file viewer. Fortunately, there are several free options available that allow you to open and inspect STP files without spending a dime.

Here are the best 5 free STP file viewer tools that you must know:

1. FreeCAD: FreeCAD is an open-source parametric 3D CAD modeler. It supports the STEP file format and allows you to view and modify 3D models with ease.

2. eDrawings Viewer: eDrawings Viewer is a free software from SolidWorks that lets you view and print native SolidWorks, AutoCAD, and DWG files, as well as STL and STP files.

3. A360 Viewer: A360 Viewer is a web-based tool that allows you to view 2D and 3D files, including STP files, directly in your browser. It's a great option if you don't want to install any software on your computer.

4. 3D-Tool Free Viewer: 3D-Tool Free Viewer is a powerful software that supports a wide range of 3D file formats, including STP. It offers advanced visualization tools for inspecting and analyzing 3D models.

5. STP Viewer: STP Viewer is a simple and free tool specifically designed for viewing STP files. It provides basic viewing features and is a lightweight option for quickly inspecting STP files.

With these free STP file viewer tools, you can easily open, view, and explore STP files without any cost. Whether you're a professional engineer or a hobbyist 3D modeler, having access to these free tools can help you streamline your workflow and make the most of your 3D models.