When it comes to viewing STP (Standard for the Exchange of Product) files, having an online STP file viewer can be incredibly convenient. Whether you're an engineer, designer, or simply someone who needs to view a 3D model, these free online STP file viewers are the perfect solution. Here are the top 5 free online STP file viewers that you can use right from your web browser.

1. Autodesk Viewer - Autodesk Viewer is a free online viewer that supports STP files along with a wide range of other 2D and 3D file formats. You can easily view, share, and review 3D models without the need for any software installation.

2. 3D-Tool Online Viewer - 3D-Tool offers a free online viewer that allows you to open and view STP files as well as many other 3D file formats. With its user-friendly interface and powerful viewing capabilities, it's a great choice for anyone in need of an online STP file viewer.

3. ShareCAD - ShareCAD is an online CAD file viewer that supports STP files as well as DWG, DXF, and other popular CAD formats. It's completely free to use and provides a simple and intuitive interface for viewing and interacting with 3D models.

4. OnlineCADViewer - OnlineCADViewer is a web-based viewer that allows you to upload and view STP files without any software installation. It's fast, secure, and supports various 3D model formats, making it an ideal choice for anyone who needs to quickly view an STP file online.

5. 3D STP Viewer - 3D STP Viewer is a free online tool specifically designed for viewing STP files. It offers a range of features for interacting with 3D models, such as zooming, rotating, and measuring, all within your web browser.

With these free online STP file viewers, you can easily view and interact with 3D CAD models without the need to install any software. Whether you're collaborating on a project, reviewing a design, or simply exploring a 3D model, these online viewers provide a convenient and efficient way to access STP files from anywhere.