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OpenNLP
Apache OpenNLP is a machine learning based toolkit for the processing of natural language text.
About OpenNLP
Apache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports sentence segmentation, tokenization, lemmatization, part-of-speech tagging, named entity extraction, chunking, parsing, language detection and coreference resolution.
The project is developed by volunteers and invites new contributors to work on all parts of the project.
Key features
- Sentence segmentation of natural language text
- Tokenization of natural language text
- Lemmatization for text processing
- Part-of-speech tagging
- Named entity extraction
- Language detection
Best for: People working on software that processes natural language text.
Good for
- Handles multiple NLP tasks in one toolkit
- Welcomes contributions from typo fixes to new components
OpenNLP at a glance
- Website
- opennlp.apache.org
- Category
- Development › Programming Languages
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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OpenNLP FAQ
What NLP tasks does OpenNLP support?
Sentence segmentation, tokenization, lemmatization, part-of-speech tagging, named entity extraction, chunking, parsing, language detection and coreference resolution.
How can I contribute to OpenNLP?
Contributions are welcome and can range from a documentation typo fix to a new component.
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