Web Annotation Tool

The Web Annotation Tool enables schema-driven annotation across large collections of web pages. It targets researchers, data scientists, educators, and developers who need consistent labeling and provenance for web content at scale.
Conceptually, it separates domain logic from presentation: users define an annotation schema, ingest pages, attach annotations to targets, and export structured data. Ingested pages can be URLs or HTML sources; the tool enforces field-level validation and cross-field constraints.
Core value comes from being open-source and extensible: a modular schema engine, export pipelines (JSON, CSV, RDF), and optional collaboration features. Advanced users can extend with plugins or automate workflows via API access.
Typical use cases include building labeled datasets for NLP, auditing content, or research data curation. Beneficiaries are research teams, platform engineers, and educators who require reproducible labeling at scale.