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This project contains documentation for OBO Format


Note that the spec is currently hosted on -- however, you should be sure to bookmark the permanent URL, which is

Use this URL:


The code is now integrated into the OWLAPI, version 3.5.x and higher

How to convert

We recommend the use of ROBOT to convert back and forth

See Conversion example:

robot convert --input foo.owl --output foo.obo

OWLTools Command Line Interface can also be used:

owltools foo.owl -o -f obo foo.obo

The use of owltools will be phased out for this purpose in favor of ROBOT

See Also

Legacy documentation