STL Viewer Online

View STL files online free in your browser. Inspect 3D printing models, check dimensions in mm/cm/inches, wireframe mode, and export HD screenshots. Files stay on your device—100% private and free.

STL Viewer100% FreeFiles Stay on Device3D Printing Ready

Drop your STL file here

or click to browse · STL only (max 50MB)

Note: STL files don't store units. We assume mm (standard for 3D printing).

How to View STL Files

1

Upload STL

Drag and drop your STL file or click to browse. View STL file online free—supports files up to 50MB.

2

Check Dimensions

View width, height, and depth in mm, cm, or inches. Essential for verifying print size.

3

Inspect Geometry

Use wireframe and flat shading to inspect mesh quality before printing.

4

Export Screenshot

Capture HD, 2K, or 4K screenshots for documentation or sharing.

3D Printing Tips

  • Verify dimensions match your printer's build volume before slicing.
  • STL files don't store units—ensure your design software and slicer use the same unit (usually mm).
  • Check triangle count: very low may mean poor quality; very high may cause slicing issues.
  • Use wireframe mode to spot non-manifold edges or holes that could cause print failures.

100% Private

Your STL files never leave your device. All processing runs in the browser.

3D Printing Focused

Unit selector, dimension readout, and scale preview built for makers and engineers.

Works Everywhere

No installation. Works on desktop and mobile in modern browsers.

Frequently Asked Questions

What is an STL file?

STL (Stereolithography) is the standard file format for 3D printing. It represents the surface of a 3D model as triangles. Most 3D modeling and slicing software supports STL.

What units does the viewer use?

STL files do not store units. We assume millimeters (mm) by default, which is standard for 3D printing. You can switch the display to cm or inches. Ensure your model was designed in the correct units.

Do my files get uploaded to a server?

No. All processing happens in your browser. Your STL files never leave your device.

Why is my model not loading?

Check that the file is a valid binary or ASCII STL. Corrupted or truncated files may fail. If the geometry appears broken, try repairing it in a 3D software like MeshMixer or Blender before viewing.

What is the maximum file size?

Files up to 50MB are supported. Files larger than 30MB may take longer to load, but all processing happens in your browser.