G-code Viewer

The G-code Viewer provides a browser-based visualization of CNC programs. It ingests standard G-code text or files, interprets moves, and renders a 2D projection of the toolpath. Conceptually, it decouples code from hardware by computing positions from the active coordinate mode, unit, and origin, then drawing the resulting path. This enables users to verify sequences, spacing, and travel without running a machine. Benefits include reduced debugging time, early collision detection, and a reusable training or evaluation environment for educators and shops. Core features include input handling for file uploads or pasted code, unit selection (mm or inches), origin adjustment, and a rendered path with position history. Advanced options may expose coordinate exports, envelope checks, and summary statistics. Use cases span CAM verification, pre-machining checks, and instructional demonstrations. Unique value lies in its combination of lightweight client-side rendering, support for standard G-code constructs, and export capabilities that integrate with CAM workflows. Since it is toolpath-centric rather than machine-accurate simulation, it excels at quick validation, hypothesis testing, and education around motion planning. Typical workflows include parsing G0/G1 moves, arcs (G2/G3), and common M-codes, with an emphasis on readability and immediate feedback. The tool is well-suited for shops with legacy code, classrooms teaching basic NC programming, and individuals debugging post-processor outputs. Use cases include verifying that a program respects clearances, identifying unnecessary travel, and exporting coordinates for further analysis.