INSTRUCTION DIFF
Compare G-code files online
Use a G-code diff built for 3D printer output. Find changed commands while filtering regenerated comments, blank lines, spacing, line numbers, or case.
GCODE · GC · GCO
Two files in. Clear changes out.
- 01Choose versionsPick the old file first and the new file second.
- 02Compare locallyYour browser reads and analyzes both files on this device.
- 03Review or exportInspect the differences and save a structured summary.
What this G-code comparison catches
Executable changesReview added, removed, and modified motion, extrusion, temperature, fan, retraction, and machine commands.
Slicer noiseIgnore comments, whitespace, blank lines, regenerated N-line numbers, or case when those differences do not affect the print.
Re-sliced jobsCompare output from Cura, PrusaSlicer, OrcaSlicer, Bambu Studio, or another slicer before sending a revised job to a printer.
Format, limits & common questions
Are my files uploaded?
No. PrintDiff has no file upload endpoint. File contents are read by browser APIs and stay on your device.
What is the current file size limit?
The preview limits each file to 50 MB to keep comparisons responsive on ordinary phones and laptops.
What if a file is damaged?
PrintDiff checks the actual file structure, not only its extension, and explains when a file cannot be parsed.