How to view G-code
- Drop the .gcode file into the box above.
- Rotate and zoom to inspect the toolpaths. Extrusion moves and travel moves are drawn in different colours.
What is G-code?
G-code (RS-274 machine instructions) was a numerical-control language dating back to the 1950s. It is a list of move commands that tells a 3D printer or CNC machine where to move and how much to extrude. It is the file a slicer produces and a printer actually runs.
Checking the G-code before printing helps catch missing layers, wrong scale or a model placed off the build plate.
Frequently asked questions
Can I convert G-code back to STL?
Not reliably – G-code contains toolpaths, not a surface. Keep the original STL or 3MF.
Is the file uploaded?
No. The file is parsed and drawn in your browser.