CorA (short for Corpus Annotator) is a web-based annotation tool that was specifically developed for use with non-standard language data, such as historical documents, social media texts, or learner data.

It runs on any modern web browser (we recommend Chrome, though Firefox and Safari should work as well) as long as JavaScript is enabled and you have an active internet connection. The source code is provided under the MIT license, which means you are free to use, copy, or modify it for any purpose, including commercially.

For additional information about the tool, please visit the CorA project website.


  • If you are totally unfamiliar with CorA, start with the introduction, which talks about the basic concepts and functionality of the software.

  • If you are a server administrator planning to run CorA on your own web server, start with the sections on installing and configuring the tool, then look at the pages under “Administrative Tasks.”

  • If you are a user working with an existing CorA installation, jump straight to the information on using the editor, then also take a look at the other pages under “Working on Documents.”


For any comments/questions/inquiries about the software, this guide, or anything else related to CorA, please contact Marcel Bollmann (

If you would like to cite CorA in a scientific publication, please use the following reference:

Marcel Bollmann, Florian Petran, Stefanie Dipper, and Julia Krasselt (2014). CorA: A web-based annotation tool for historical and other non-standard language data. In: Proceedings of the 8th Workshop on Language Technology for Cultural Heritage, Social Sciences, and Humanities (LaTeCH), pp. 86–90. Gothenburg, Sweden.