STEP file viewer — free in your browser
View STEP and STP files without CAD software. Modelyser shows dimensions, parts, volume and print analysis directly in your browser.
No account needed. Your STEP file stays local.
Open STEP in viewerRuns in your browser
No installation needed. Your model is processed locally and never uploaded to a server.
Dimensions and volume
Instantly see X, Y and Z dimensions, triangle count and estimated volume.
Orient for printing
Rotate and lay your model flat on a face so you can see how it sits on the build plate.
Check printability
Inspect overhangs and visualise wall thickness as a heatmap for better prints.
Measure inside the viewer
Click points, diameters or axes to measure distances accurately.
Hide parts
For multi-part models you control which parts are visible.
Why use an online STEP viewer?
STEP files are often used to exchange accurate 3D data between CAD programs. With this online STEP viewer you don't need to install expensive software to view or check a model.
If your STEP file consists of multiple parts, you can toggle each part individually. That makes it easy to analyse only the part you care about.
Your file stays yours
Modelyser runs entirely in your browser. Your model is not sent to a server and you do not need an account. Perfect for confidential designs or a quick check without installing software.
- No account needed
- No sign-in
- Nothing uploaded to a server
- Works on desktop and tablet
STEP viewer FAQ
What is the difference between STEP and STP?
There is no real difference. STP is the short file extension for the same STEP format.
Can I view multiple parts?
Yes. Modelyser recognises the parts in your STEP file and lists them. You can hide parts.
Is my model converted?
The model is locally converted into a display mesh. The original file is not modified or uploaded.
Can I measure?
Yes. The measurement tool supports points, circles and axes so you can determine diameters or centre-to-centre distances.
Other 3D viewers
Open your STEP file
Drop your STEP or STP file here to view it instantly.
Open STEP viewer