G-code generators

Pick an operation, fill in the dimensions, and copy or download the program. Everything is in the chosen units (mm or inch — the program uses G21 or G20 to match). Z = 0 is the top of the stock; cuts go negative. The preview is a top view (darker blue is deeper; red dashes are rapids).

Surfacing runs a raster along X or Y, or an inward offset spiral, overhanging the edges by the overhang × tool radius so the corners are cleaned.
Rectangular pocket clears with offset rings from the centre outward after a ramped entry; inside corners keep the tool radius. Circular pocket enters with a helix at the centre and steps outward in full circles.
Drill pattern: a grid (serpentine order) or bolt circle. GRBL has no canned cycles, so pecks are expanded into moves; tick canned cycles for LinuxCNC/Mach to get G81/G83.
Profile cut-out: outside, inside, or on the line of a rectangle or circle, with tabs left standing on the passes deeper than the tab height.
Printer programs are Marlin G-code with heat-up and homing. First-layer squares sit at the corners and centre; the retraction towers step the retraction distance every band (the comments say which); the e-steps routine extrudes exactly 100 mm.

Always check a generated program in a simulator (try the G-code viewer) and with an air cut before cutting material.

Share link copies a URL that opens this tool exactly as you have it set up. It carries the operation and all of its parameters. Opening a link replaces your own saved settings for the tool; a Restore my settings button brings them back. To write a link by hand, use op, units, dialect — for example /tools/gcode-gen/?op=surfacing&units=inch&dialect=grbl.

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