STL Viewer
Open and inspect your STL model in the browser.
Your model goes here.
Choose your file or try the original sample below. No installation or sign-up.
01 / HOW IT WORKS
Open, inspect, then use your result.
- 01
Open your file
Choose, drop or paste your STL file. All three input methods use the same local checks.
- 02
Look from every angle
Orbit, zoom and switch between standard views. Read the dimensions and object count beside the model.
- 03
Check the essentials
Read the mesh object count and overall dimensions. Clear the file when you are done or open another model.
02 / TRY IT YOURSELF
A real file. A result you can check.
This original four-hole plate measures 80 × 50 × 8 mm. The sample uses the input format for this page. Use the default unit and axis settings to reproduce those dimensions.
Original public sample. Your uploads are never added to this gallery.
03 / FORMAT & USE
STL Viewer
Inspect an ASCII or binary STL before opening a slicer. Rotate the triangle mesh, use standard views and check its overall dimensions and triangle count.
What this viewer supports
STL has no reliable unit or up-axis declaration. The default is millimetres with Z up. This viewer does not test watertightness, fix normals or certify a file for printing.
Supports files up to 32 MiB, 1 million triangles and 2,000 mesh objects. For larger assemblies, export only the parts you need.
04 / QUESTIONS
Know your input. Understand your output.
Does opening an STL prove it is printable?
No. A visible mesh can still contain holes, overlaps or very thin walls. Use your slicer and manufacturing checks before printing.
Do I need an account or credits?
No. These tools are free and run in your browser. No account, subscription or credits are required.
Is my model uploaded?
No. Your selected file is read and processed in this browser. The page downloads its CAD engine and public samples, but does not upload your model. Refreshing or leaving the page clears the current file from the tool.
How are units and orientation handled?
Dimensions use millimetres with Z up. GLB uses metres with Y up; exported STL is mm/Z-up and OBJ is mm/Y-up.
Can I paste a file from my computer?
Copy a file in your file manager, then paste here. Your browser must expose the clipboard as a file; a copied path or text will not open a model.