Open Source

Semantic HTML Annotation Platform

Professional-grade tool for structured document labeling and annotation workflows

Accelerate your NLP projects with precision annotation tools. Create hierarchical label schemas, manage complex document structures, and streamline annotation workflows for machine learning datasets, legal document analysis, and research corpus preparation.

Hierarchical label structures
Pattern-based bulk labeling
Coreference resolution support

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Choose your workflow

Start Labelizing Annotate and structure your documents Try Interactive Demo Explore with a pre-configured example
More Tools
Project Overview Manage and monitor annotation projects
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Inter-Annotator Agreement Compare and analyze annotation consistency
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100% Client-side
Open Source
Zero Server Cost