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STL & 3MF Viewer

View STL files in 3D online for free — rotate and zoom a shaded preview, inspect volume, surface area, dimensions and manifold errors. Files never leave your browser.

Drop an STL file here, or

.stl binary or ASCII · .3mf · sample: 3DBenchy, CC0 (3dbenchy.com)

About STL & 3MF Viewer

Drop a binary or ASCII STL or a 3MF file to spin it around in a real-time shaded 3D preview — drag to rotate, scroll to zoom, auto-rotate available. No upload: the mesh is parsed and rendered locally with WebGL.

Alongside the preview you get exact mesh statistics: triangle count, volume via the divergence theorem, surface area, bounding box and a non-manifold edge count that flags meshes needing repair — plus a solid-weight estimate per material.