Fido (Format Identification for Digital Objects) is an open-source command-line tool to identify the file formats of digital objects.
The software is written in Python and is designed to be run from the command line. FIDO utilises the PRONOM format registry, which is maintained by The National Archives UK It is well suited for quickly returning the PRONOM identifiers from single files or batches of files.
Originally developed by Adam Farquhar of British Library in 2010, OPF took stewardship of Fido in 2015.
Artefactual maintains Fido as part of their technical contributor membership with coding support provided by the Foundation. Fido can be automatically installed with Archivematica, but it is also available as a stand-alone command-line tool and can be incorporated into other digital preservation systems.