I was debugging problems by checking out G-Code.  I was tired of looking up the codes so I wrote a quick JavaScript page to add comments to the g-code.  Simply type or paste some g-code into the page and it will add comments explaining the code.

I only spent an hour or two on it, so it is pretty basic and probably has some bugs.  It worked on all of the g-code files I could find including the ones that come with Mach.  It is not designed for files with thousands of lines, but will probably work if you are patient.

Feel free to copy it, modify it, etc.  Everything is in one html file.  If you have comments or suggestions, reply to this post or email me.  I will update it as time permits.

http://www.eng-serve.com/cnc/gcode_comment.html