Article · Wikipedia archive · Last revised Jun 6, 2026

Apache OpenNLP

The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text. It supports the most common NLP tasks, such as language detection, tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing and coreference resolution. These tasks are usually required to build more advanced text processing services.

Last revised
Jun 6, 2026
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Apache OpenNLP
DeveloperApache Software Foundation
Initial releaseJuly 19, 2004 (2004-07-19)
Stable release
2.5.3 / January 10, 2025 (2025-01-10)1
Written inJava
TypeNatural language processing
LicenseApache License 2.0
Websiteopennlp.apache.org Edit this on Wikidata
RepositoryOpenNLP Repository

The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text. It supports the most common NLP tasks, such as language detection, tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing and coreference resolution. These tasks are usually required to build more advanced text processing services.23

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