FIDO (Format Identification for Digital Objects)

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FIDO (Format Identification for Digital Objects)
A PRONOM based, command line, file format identification tool written in Python
License:Apache 2.0 Open Source License
Function:Metadata Extraction,File Format Identification


FIDO (Format Identification for Digital Objects) is a simple format identification CLI tool for digital objects that uses PRONOM signatures converted to regular expressions. The functionality of FIDO is similar to DROID (Digital Record Object Identification) without the GUI.

FIDO is free, Apache 2.0 licensed, easy to install, and runs on any platform with Python installed. Most importantly, FIDO is very fast.

FIDO utilizes all available PRONOM signatures to identify digital objects. When an object can not be identified it will try to identify the object based on extension.

FIDO outputs results in CSV format by default. Available output fields can be formatted on runtime per the requirements of the user.

FIDO supports custom signatures which are not (yet) available through the PRONOM registry.

FIDO is able to identify container based (compound) formats such as Office documents and includes functionality to update PRONOM signatures.

FIDOO is webpage based service that acts as a simple to use front end to FIDO.


FIDO was originally developed in 2010 by Adam Farquhar of British Library. The tool has been adopted by the Open Preservation Foundation in 2011 and is currently maintained by Maurice de Rooij of the National Archives of the Netherlands (NANETH). In October 2011 NANETH has succesfully implemented FIDO as a webservice in the Dutch e-Depot.


See roadmap


Feedback about FIDO is very welcome. Please consult Getting Started with the OPF for more information.

User Experiences[edit]

Development Activity[edit]

All development activity is visible on GitHub:

Release Feed[edit]

Below the last 3 release feeds:

2022-12-22 10:27:39
[,2008:Repository/1025035/v1.6.1 Fido v1.6.1]
by carlwilson
2022-08-03 12:48:10
[,2008:Repository/1025035/v1.6.0rc5 FIDO v1.6rc5]
by carlwilson
2022-03-29 07:48:49
[,2008:Repository/1025035/v1.6.0rc1 v1.6.0 Release Candidate]
by carlwilson

Activity Feed[edit]

Below the last 5 commits:

2022-12-22 10:26:15
[,2008:Grit::Commit/67d878668642cf6eda8f4176d6ff9949abb56af0 Merge pull request #211 from openpreserve/rel/1.6]
by carlwilson
2022-12-22 10:22:56
[,2008:Grit::Commit/7cb03470318677ebc39e6728d05b7ab6b26728ad REL: Fido v1.6.1]
by carlwilson
2022-12-16 16:42:49
[,2008:Grit::Commit/72c97277289373367bd382da6025e558b3ebafcb Merge pull request #210 from openpreserve/rel/1.6]
by carlwilson
2022-12-16 16:24:12
[,2008:Grit::Commit/d26d2b06fa820544b82b6bf8c7159ddaa69e1c28 FIX: Coverage report path.]
by carlwilson
2022-12-16 16:22:10
[,2008:Grit::Commit/a7a5557e39d01bdc3fc324007630db072d7f1e5a FIX: Coverage report path.]
by carlwilson