Upload and preview STEP and STP files directly in your browser. No software required. Orbit, pan, and zoom your 3D CAD models instantly.
Last updated April 2026
STEP (Standard for the Exchange of Product Data) is an ISO 10303 standard file format for 3D CAD data exchange. Files use .step or .stp extensions and contain precise B-rep solid geometry that transfers between any CAD system without data loss. STEP is the most widely supported neutral format for manufacturing, making it the standard for quoting and production.
Use a browser-based viewer like this tool to upload and preview STEP files instantly without installing any software. You can orbit, pan, and zoom the 3D model directly in your browser. For offline viewing, free options include FreeCAD, eDrawings Viewer from SolidWorks, and Autodesk Viewer, all of which open STEP files without a paid CAD license.