A Flexible, Web-based and Visually Supported System for Distributed Annotations

WebAnno is a general purpose web-based annotation tool for a wide range of linguistic annotations including various layers of morphological, syntactical, and semantic annotations.Additionaly, custom annotation layers can be defined, allowing WebAnno to be used also for non-linguistic annotation tasks.

WebAnno is a multi-user tool supporting different roles such as annotator, curator, and project manager. The progress and quality of annotation projects can be monitored and measuered in terms of inter-annotator agreement. Multiple annotation projects can be conducted in parallel.

Different modes of annotation are supported, including a correction mode to review externally pre-annotated data, and an automation mode in which WebAnno learns and offers annotation suggestions.

WebAnno is a fully web-based tool with a lower entry barrier than other annotation tools. Annotators and annotation project managers do not require to download any software. A modern web-browser is sufficent. After installation on a web-server, all settings can be reached through the browser.

How to cite

If you use WebAnno in scientific work, please cite one of the publications below.

To cite the semantic annotation support and WebAnno 3:

Eckart de Castilho, R., Mújdricza-Maydt, É., Yimam, S.M., Hartmann, S., Gurevych, I., Frank, A. and Biemann, C. (2016): A Web-based Tool for the Integrated Annotation of Semantic and Syntactic Structures. In Proceedings of the LT4DH workshop at COLING 2016, Osaka, Japan (pdf) (bib)

To cite the automatic annotation and customizable annotation layer support and WebAnno 2:

Yimam, S.M., Eckart de Castilho, R., Gurevych, I., and Biemann C. (2014): Automatic Annotation Suggestions and Custom Annotation Layers in WebAnno. In: Proceedings of ACL-2014, demo session, Baltimore, MD, USA (pdf) (bib) (poster pdf)

To cite WebAnno within the CLARIN-D infrastructure:

Eckart de Castilho, R., Biemann, C., Gurevych, I. and Yimam, S.M. (2014): WebAnno: a flexible, web-based annotation tool for CLARIN. In Proceedings of the CLARIN Annual Conference (CAC) 2014, Soesterberg, Netherlands. (pdf) (bib) (slides pdf)

To cite WebAnno 1:

Yimam, S.M., Gurevych, I., Eckart de Castilho, R., and Biemann C. (2013): WebAnno: A Flexible, Web-based and Visually Supported System for Distributed Annotations. In Proceedings of ACL-2013, demo session, Sofia, Bulgaria. (pdf) (bib)

WebAnno 3 Team

project lead
project lead
Aakash Sharma
junior developer
Anshul Tak
junior developer
Sushil Jain
junior developer
scientific consulting
scientific consulting


WebAnno is provided as open source under the Apache License v2.0.