G-code Viewer Online Free - Preview CNC & 3D Printer Files

View G-code files instantly in your browser. Visualize 3D printer toolpaths, CNC movements, layer by layer. No download needed. Works with any slicer output.

Drop G-code file here or click to browse

.gcode, .nc, .tap, .ngc, .txt files

File Info

Load a G-code file

Bounds

Display

Show Rapid (G0)

Show Travel

Show Grid

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Frequently Asked Questions

G-code is the standard programming language for CNC machines and 3D printers. It contains movement commands (G0, G1), positioning data, speeds, and machine instructions.

CNC mills and lathes, 3D printers (FDM, SLA), laser cutters, plasma cutters, routers. Most makers and manufacturers use G-code daily.

Movement commands G0 (rapid), G1 (linear), G2/G3 (arcs). The viewer shows tool paths, distinguishing between rapid moves and cutting/printing moves.

Yes. 3D printer G-code from Cura, PrusaSlicer, Simplify3D shows layer-by-layer paths. Use the layer slider to inspect print layers.

Yes. All processing happens locally in your browser. Your manufacturing files never leave your device, protecting your designs and processes.

G2 (clockwise) and G3 (counter-clockwise) arc commands are interpolated into line segments for display. I/J or R format arcs are supported.

Movement colors indicate feed rate: rapid moves in one color, slow cuts in another. Hover for exact F values at any point.

G90 (absolute) and G91 (incremental) positioning. G20/G21 for inch/millimeter units. The viewer adapts to detected modes.

Use zoom, pan, and rotation to navigate 3D view. Layer slider for 3D prints. Click points to see exact coordinates and commands.

Use the playback controls to animate the toolpath execution. Speed can be adjusted to review the machining sequence.

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