Online GCode Checker

Validate and analyze G-code files for CNC machines with instant error detection and optimization suggestions.

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Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

This online G-code checker tool helps CNC programmers and machinists validate their G-code files for syntax errors, potential issues, and optimization opportunities. Upload your .nc or .txt files or paste G-code directly to get detailed analysis including line-by-line validation, error detection, and warnings about unsafe commands. The tool supports common G-code dialects (Fanuc, Haas, LinuxCNC) and provides actionable feedback to improve your CNC programs.

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How to Use

Upload a G-code file (.nc, .txt, .gcode) or paste your code directly into the text area.
Select your machine type (Fanuc, Haas, or LinuxCNC) for dialect-specific validation.
Choose validation options like checking for rapid moves near workpiece or missing tool changes.
Click 'Check G-code' to analyze your code.
Review the results showing errors, warnings, and statistics about your G-code program.

Frequently Asked Questions

Find Quick Answers

What G-code dialects does this tool support?

The tool supports common CNC dialects including Fanuc, Haas, and LinuxCNC. Select your machine type before validation for dialect-specific checks.

What types of errors can this G-code checker detect?

The tool detects syntax errors (invalid commands, missing parameters), potential safety issues (rapid moves near workpiece, missing tool changes), and optimization opportunities (inefficient toolpaths, redundant commands).

Is my G-code data secure when using this tool?

Yes, all processing happens entirely in your browser. No G-code files or data are sent to any server - everything is processed locally for complete privacy.

What file formats are supported for upload?

You can upload .nc, .txt, .gcode, and other text-based G-code files. The tool also accepts direct pasting of G-code into the text area.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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