🧊 STL Viewer

View STL 3D models in your browser.

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Drop your file here

or click to browse — max 100 MB

📖 How to Use STL Viewer

Upload your STL file — Drag and drop it into the upload area, or click "Choose File".
View your 3D model — The STL renders on the canvas instantly with realistic lighting.
Rotate and inspect — Drag to rotate, scroll to zoom, use the wireframe toggle to see the mesh structure.
Check mesh statistics — Triangle and vertex counts help you assess model complexity.
Export as PNG — Download a snapshot of the current view, or click "New File" to load another model.

ℹ️ About STL Viewer

STL Viewer is a free, browser-based tool that renders STL 3D models interactively using WebGL and Three.js. STL (Stereolithography) is the most common 3D printing file format, supported by virtually all CAD and 3D printing software.

This viewer supports both ASCII and binary STL files. It loads your model, computes its bounding box, centers it, and renders it with realistic lighting. You can rotate, zoom, pan, and toggle wireframe mode to inspect the mesh structure.

Perfect for 3D printing enthusiasts, engineers, and designers who need to preview STL files quickly without installing specialized software like Meshmixer or PrusaSlicer.

✨ Why Choose SmartCAD STL Viewer

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Real 3D Rendering

Hardware-accelerated WebGL rendering with realistic lighting.

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Orbit Controls

Rotate, zoom, and pan freely. Wireframe mode available.

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Mesh Statistics

Triangle count, vertex count, and bounding box dimensions.

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100% Private

Your files never leave your browser. No uploads, no tracking.

❓ Frequently Asked Questions

Is my STL file uploaded to a server?

No. All rendering happens locally in your browser using WebGL. Your STL file never leaves your device.

What STL formats are supported?

Both ASCII and binary STL files are supported. File size up to 100 MB.

Can I edit the STL file?

STL Viewer is read-only. To edit STL files, use 3D modeling software like Blender or FreeCAD.

Does it work on mobile?

Yes. STL Viewer works on any modern browser — desktop, tablet, or mobile.

Can I export the view as an image?

Yes. Click the PNG button to download a snapshot of the current 3D view.