Free Online STL Viewer
Inspect, measure, and verify 3D STL files directly in your web browser. Check polygon triangles, bounding box dimensions, and watertight manifold status before slicing.
Don't have an STL file yet?
Transform any 2D photo, illustration, or sketch into a watertight 3D STL file in seconds.
Why Engineers & Makers Choose iGen3D STL Viewer
Instant WebGL hardware rendering engineered specifically for 3D printing prep, CAD design reviews, and rapid prototyping.
Works Seamlessly with Top 3D Slicers
Every STL file viewed or generated is universally compatible with standard additive manufacturing toolchains.
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Inspect 3D GLB/GLTF assets with full PBR textures, animation controls, and lighting environments.
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Convert single pictures into game-ready GLB models with realistic PBR textures and normal maps.
Frequently Asked Questions
Everything you need to know about opening and inspecting STL files in your browser.