GMT Online Services gives access to three sets of documentation:

1. GMT Technical Reference and Cookbook.
   • HTML Format
   • PostScript Format (PS)
   • Portable Document Format (PDF)
2. GMT Tutorial.
   • HTML Format
   • PostScript Format (PS)
   • Portable Document Format (PDF)
3. GMT Unix man pages [HTML format].
   • Main GMT man pages
   • Supplemental GMT man pages.