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STL 3D Previewer

Load, inspect, and analyze 3D printable STL files. Render in flat/smooth shading or point cloud, measure volume/dimensions, and examine mesh statistics.

Interactive Online Utility

STL 3D Previewer runs 100% locally in your browser sandbox with zero network roundtrips. Load or paste your code directly into the workspace above to format, parse, validate, or generate your output instantly.

PRO TIP Local Client-Side Processing

Otuls runs 100% locally in your browser. Your data is processed in-memory and never transmitted over external network connections.

Technical Guide & Overview

STL (Stereolithography) is the de facto standard CAD and 3D printing file format, representing three-dimensional surface geometry through triangulated polygonal surface meshes.

How It Works Under the Hood

Otuls parses both ASCII and Binary STL formats directly into WebGL vertex attribute buffers. It calculates normal vectors, geometric bounding volumes, total surface area, watertight manifold integrity, and bounding box dimensions (X, Y, Z in millimeters) with high-frame-rate Three.js rendering.

Authoritative Specifications & Primary Standards

Official specifications, RFCs, and authoritative open-source repositories for STL 3D Previewer:

GitHub Repository

The premier open-source WebGL 3D rendering engine powering browser visualization.

Official Manual

Industry standard for hardware-accelerated 3D graphics inside the browser.

CLI Equivalents & Terminal Automation

Inspect 3D STL triangles with OpenSCAD:
openscad -o preview.png --render model.stl
Headless CLI rendering of 3D STL files for automated build verification.

Zero-Knowledge Client-Side Sandboxing

Your 3D CAD files, proprietary prototypes, and mechanical designs are processed 100% locally via WebGL. Zero CAD geometry is uploaded to external servers.