01 Inspect STL files in your browser
Open and view STL files directly in your browser. Rotate, zoom and inspect your 3D model — no download or sign-up required.
02 Inspect with confidence
Our free online STL viewer gives you a clear, accurate look at a model before it reaches the slicer. There is no installer or account—just open a file and start inspecting.
Drag to examine every surface, switch to wireframe to see how the model is built, and check dimensions, triangle count, volume and surface area in one place.
03 Simple workflow
Drop a binary or ASCII STL into the workspace.
Rotate, pan, zoom and fit the part to your screen.
Review dimensions and mesh statistics before printing.
04 Dimensions and model details
See the information hidden inside an STL at a glance. The viewer calculates the model’s X, Y and Z dimensions, unique vertices, triangle count, surface area, estimated volume and bounding box. It also identifies whether the source is an ASCII or Binary STL file. Because STL files do not store a unit, dimensions are interpreted as millimeters—the convention used by most 3D-printing slicers.
05 Point-to-point
Select Measure in the viewer toolbar, then click any two points on the model. The point-to-point distance appears using the same assumed millimeter scale while the model stays interactive. Use it to confirm clearances, wall spans or important features before slicing; if your source was modeled in inches, convert the scale before relying on the result.
06 Before you print
After you open a file, the viewer checks whether the model is watertight and reports exact counts for common geometry problems.
A clean result confirms the basic mesh structure, not printability. Wall thickness, overhangs, clearances and printer tolerances are not evaluated. Volume is considered reliable only for a closed mesh with consistent geometry.
Problems found? Repair your STL07 Related workflows
Move from inspection to conversion, repair or editing—all from your browser.
Resize, rotate, mirror, split and export STL files.
02Convert transparent PNG logos and icons into STL models.
03Turn JPG photos into relief and lithophane STL models.
04Turn photos, logos and 2D artwork into printable STL models.
05Find and fix broken or non-manifold meshes.
08 Common questions
An STL viewer opens the triangle mesh inside an STL file and displays it as a 3D model. You can inspect the shape, dimensions and mesh details without opening CAD software.
Drop an STL file into the viewer above or choose one from your device. The file is processed in your browser and appears in the 3D viewer, ready to rotate, zoom and inspect.
Yes. The viewer is free to use, requires no account, and processes the file locally in your browser. Your STL model is never uploaded to our servers.
No. This STL viewer runs in a modern web browser on Windows, macOS and Linux.
Yes. The viewer reports overall X, Y and Z dimensions, and the Measure tool lets you click two points on the model to check the distance between them.
Yes. The viewer works in modern browsers on Windows, macOS and Linux. There is no platform-specific app to install, and your STL stays on your device.