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LanguageTool

A proofreading tool for English, Spanish, German, French, Portuguese, Dutch, Ukrainian and more languages

Version 6.6-SNAPSHOT (2025-xx-xx)
Copyright (C) 2005-2024 the LanguageTool community and Daniel Naber (www.danielnaber.de)
https://languagetool.org

Requirements

  • Java 17 or later

Usage

Command-line version

To check plain text files from the command line, use

java -jar languagetool-commandline.jar -l xx <filename>

with xx being the code for your language, e.g. en-US for American English or just en for English without spell checking activated.

If you get a java.lang.OutOfMemory error, try increasing the Java heap size as follows, where 4096 is the size in megabytes (use more or less, depending on your file size and memory available).

java -Xmx4096M -jar languagetool-commandline.jar -l xx <filename>

Stand-alone version

To use the stand-alone version, double-click on the languagetool.jar file or call java -jar languagetool.jar from the command line.

HTTP API

See https://dev.languagetool.org/public-http-api and https://languagetool.org/http-api/swagger-ui/#/default

Java API

See https://dev.languagetool.org/java-api

License

Unless otherwise noted, this software is distributed under the LGPL, see file COPYING.txt

See third-party-licenses/README.txt for the copyright of the external libraries.

Frequency data

Some language's spelling dictionaries contain frequency data. This is taken from the Mozilla-B2G Gaia project (https://github.com/mozilla-b2g/gaia/) which again takes it from Spell On It (http://www.spellonit.com/downloads/frequencies/). The frequency data is released under Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).

Asturian

See org/languagetool/resource/ast/README.txt and org/languagetool/resource/ast/hunspell/LICENSES*.txt

Belarusian

See org/languagetool/resource/be/hunspell/README.txt

Breton

See org/languagetool/resource/br/README.txt and See org/languagetool/resource/br/hunspell/README.txt

Catalan

See org/languagetool/resource/ca/README.txt

Chinese

See org/languagetool/resource/zh/README.txt

Danish

See org/languagetool/resource/da/README.txt and org/languagetool/resource/da/spelling/README_da_DK.txt

Dutch

See org/languagetool/resource/nl/README.txt and org/languagetool/resource/nl/spelling/README.txt

English

See org/languagetool/resource/en/pos-readme.txt and org/languagetool/resource/en/12dicts-readme.html

Esperanto

See org/languagetool/resource/eo/hunspell/README_eo.txt

French

See org/languagetool/resource/fr/README_lexique.txt and org/languagetool/resource/fr/hunspell/fr_FR.README

Galician

See org/languagetool/resource/gl/README.txt and org/languagetool/resource/gl/hunspell/README-gl-ES.txt and LICENSES-en.txt

German

See org/languagetool/resource/de/README.txt and org/languagetool/resource/de/hunspell/*README.txt

Greek

See org/languagetool/resource/el/README.txt and org/languagetool/resource/el/hunspell/README_el_GR.txt

Italian

See org/languagetool/resource/it/README.txt and org/languagetool/resource/it/hunspell/README_it_IT.txt

Japanese

No POS or spelling data included in these sources.

Khmer

See org/languagetool/resource/km/README.txt

Malayalam (inactive)

See org/languagetool/resource/ml/README.txt

Persian

See org/languagetool/resource/km/README.txt

Polish

See org/languagetool/resource/pl/README.txt and org/languagetool/resource/pl/hunspell/README_en.txt

Portuguese

See org/languagetool/resource/pt/portuguese_dict_README and org/languagetool/resource/pt/hunspell/README*.txt

Romanian

See org/languagetool/resource/ro/README.txt and org/languagetool/resource/ro/hunspell/README_*.txt

Russian

See org/languagetool/resource/ru/README.txt and org/languagetool/resource/ru/hunspell/README.txt

Serbian

See org/languagetool/resource/sr/README.md and org/languagetool/resource/sr/dictionary/ekavian/README_hunspell.txt and org/languagetool/resource/sr/dictionary/jekavian/README_hunspell.txt

Slovak

See org/languagetool/resource/sk/README.txt

Slovenian

See org/languagetool/resource/sl/hunspell/README_sl_SI.txt

Spanish

See org/languagetool/resource/es/hunspell/README_es_ES.txt and org/languagetool/resource/es/README.txt

Swedish

See org/languagetool/resource/sv/hunspell/LICENSE*.txt and org/languagetool/resource/sv/README.txt

Tagalog

See org/languagetool/resource/tl/README.txt

Tamil

See org/languagetool/resource/ta/README.txt

Ukrainian

See org/languagetool/resource/uk/README.txt