Release of brat annotation tool v1.3


We are pleased to announce brat v1.3 (Crunchy Frog), an open-source (MIT), browser-based tool for text annotation. The tool is available from:

Examples of past and potential usage presented at:

brat is a general-purpose tool for the visualisation and creation of annotations for tasks such as entity mention annotation, relation and event annotation, dependency syntactic annotation, and others. The new version introduces many new features to the tool, including:

For details, please see:

If you want to upgrade an existing installation, please see:

brat is developed as a collaborative effort between several research groups as an open source and open development project, and we warmly welcome contributions and participation from the community. Possible contributions are not limited to code, but also include feature requests, bug reports and more.

Since its initial release, brat has been adopted for use in corpus annotation and other tasks by various groups. We hope this new version will be as well received as the initial release of the tool, and will gladly answer questions and welcome any feedback.

Additional information

The new normalisation features were presented in:

Stenetorp et al. Normalisation with the brat rapid annotation tool. In Proceedings of SMBM'12


Mailing list

To join the brat-users mailing list, send an e-mail to:

Or visit the brat-users Google Group homepage:

The primary brat developers are:

  • Pontus Stenetorp (Aizawa laboratory, University of Tokyo)
  • Goran Topic (RCKMCS, National Institute of Informatics)
  • Sampo Pyysalo (NaCTeM, University of Manchester)
  • Tomoko Ohta (NaCTeM, University of Manchester)

Previous itemNext item
Back to news summary page