Public HTTP API

We offer an HTTPS REST service that anybody can use to check texts with LanguageTool. When using it, please keep the following rules in mind:

  • Please do not send automated requests. For that, set up your own instance of LanguageTool, which is very easy.
  • Access is currently limited to 20 requests per IP per minute.
  • The maximum text size is limited (currently to 50KB).
  • Only HTTPS is supported, not HTTP.
  • This is a free service, thus there are no guarantees about performance or availability.
  • The LanguageTool version installed may be the latest official release or some snapshot. We will simply deploy new versions, thus the behavior might change without any warning.
  • We promise that we only log meta data of your requests (like date/time, text length, language, number of errors found, HTTP referrer), not the actual text. See our privacy policy.

URL

The service is running at languagetool.org port 8081, so you can test it like this:

https://languagetool.org:8081/?language=en-US&text=my+texd

If you're not just testing you should use POST to transfer your data. You can test it like this, using curl:

curl --sslv3 --data "language=en-US&text=my texd" https://languagetool.org:8081

Note that the text needs to be URL-encoded, even for POST requests.

Please see HTTP server for information about the parameters you can supply.

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