STL viewer online — free, no account
View your STL file instantly in the browser. Check dimensions, volume, triangles and whether your model is suitable for 3D printing.
No account needed. Your STL file stays on your own computer.
Open STL 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 STL viewer?
STL is the most common file format for 3D printing. With this online STL viewer you don't need to open a CAD program to inspect a model. You immediately see the overall size, triangle count and estimated volume.
You can also check overhangs with a customisable angle and view wall thickness as a heatmap. That way you spot potential problems before printing.
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
STL viewer FAQ
Can I open both binary and ASCII STL files?
Yes, both variants are automatically detected and loaded.
How large can an STL file be?
It depends on your device. Modelyser runs locally, so the limit is mainly set by the memory of your computer or tablet.
Can I measure inside the STL viewer?
Yes. Use the measurement tool to click points, diameters or axes and calculate distances.
Do I need to download anything?
No. Everything happens in your browser.
Other 3D viewers
Open your STL file
Drop your STL here or click to choose a file.
Open STL viewer