CAD & 3D
STEP Viewer
Open and view STEP and STP files online. Inspect CAD models, assemblies, parts, dimensions, and geometry directly in your browser.
Tool
Open and view STEP and STP files online. Inspect CAD models, assemblies, parts, dimensions, and geometry directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online STEP Viewer to open and inspect STEP or STP files without installing professional CAD software. Explore individual parts and complete assemblies, rotate the model, zoom into technical details, inspect its dimensions, and switch between shaded and edge-based views. The STEP model is read and rendered locally in your browser, keeping your CAD data on your device.
Examples
- cube.step
- rounded-part.stp
Frequently Asked Questions
What is a STEP file?
STEP is a standardized CAD exchange format used to transfer precise 3D geometry between different engineering and manufacturing applications. Files commonly use the .step or .stp extension.
Can I open both STEP and STP files?
Yes. STEP and STP are different filename extensions for the same general file format, and both can be opened by the viewer.
Can the viewer display STEP assemblies?
Yes. When assembly and product structure information is available, the viewer can load models containing multiple parts and display their combined geometry.
Why can a large STEP file take longer to open?
STEP files contain precise CAD surfaces that must be converted into displayable triangles before they can be rendered. Large assemblies, detailed curved surfaces, and models with many parts require more processing time and memory.
Is my STEP file uploaded?
No. The file is processed locally in your browser and does not need to be transferred to a remote server.