WebAnno - Welcome

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.

You like WebAnno?


INCEpTION is the new open source text annotation platform that has all the flexibility and many more exciting features including a completely new human-in-the-loop annotation assistance support, the ability to search texts and annotations, support for RDF/SPARQL knowledge bases for entity linking, and much more.
And best: it can import your WebAnno annotation1 projects.
1 Projects of type 'automation' or 'correction' are not supported.

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 our latest publication.

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)

For further publications about WebAnno, please refer to the publications page.


  • Richard Eckart de Castilho, UKP Lab, Technische Universität Darmstadt

For more information on past team compositions, please refer to the info page.

For a list of contributors to the project, please refer to the CONTRIBUTORS file.


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