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# Enable Automatic Language Detection

If your IDOL Server license includes automatic language detection, IDOL Server can automatically identify the language and encoding of a document when it is indexed. IDOL Server analyzes a certain amount of text in the document content fields (fields for which `SourceType` is set to `True` in the IDOL Server configuration file).

To enable automatic language detection

1. Open the IDOL Server configuration file in a text editor.

2. Find the `[Server]` section and add this setting:

       AutoDetectLanguagesAtIndex=True

3. Set `DiscardUnconfiguredLanguagesAtIndex` to `True` if you do not want to index documents with a language type that is not configured.

   Set `DiscardUnknownLanguagesAtIndex` to `True` if you do not want to index documents whose language IDOL cannot recognize. For example, it might not recognize the language because the document does not contain language, or it might not have enough text for IDOL Server to determine the language.

   By default IDOL Server indexes the document using the default language type. It also logs a warning message in the index log, so that you can add an appropriate language type.

4. You can change the amount of text that IDOL Server analyzes to detect the language of a document. By default, IDOL Server uses only a few sentences. In some situations, increasing the amount of text to analyze can give more accurate results, such as when significant amounts of a minor second language are present.

   Add the `MaxLanguageDetectTerms` setting to the `[Server]` section, specifying the number of terms (words) that IDOL Server uses for detection. For example:

       MaxLanguageDetectTerms=1000

5. By default, IDOL Server detects any 7-bit ASCII characters as UTF-8. If you instead want to group these documents with documents using 8-bit ASCII, disable the `LangDetectUTF8` parameter by setting it to `False`.

   Ensure that the encoding option you want is present in the language type configuration (see Define Language Types). If there are no compatible encodings configured for the detected language, IDOL assigns the default language type.

6. Save and close the configuration file. Restart IDOL Server for your changes to take effect.

Note: If you enable automatic language detection and set up a field process that reads the language of a document from one of its fields, IDOL Server uses the field process rather than autodetection to determine the document language and encoding.

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