GCodex

Free online G-Code viewer & simulator for CNC and 3D printer

2 votes·1 comment·May 19, 2026

About

GCodex is a free, browser-based G-Code viewer and simulator. No upload required, no signup needed. Features: - 3D & 2D toolpath visualization - Layer-by-layer inspection - Works with CNC machines and 3D printers - Supports Marlin, Klipper, and standard G-Code - Faster and cleaner than NCViewer and gcode.ws Just paste or load your G-Code file and instantly visualize your toolpaths. Perfect for makers, engineers, and hobbyists.