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Change Thunderbird's language

How to change the language of the menus and of spell checking in Thunderbird.

You can change the language of Thunderbird’s menus and, separately, the language used to spell check what you write.

This is the language of Thunderbird’s menus, buttons and screens.

  1. Go to Settings > General > Language & Appearance > Language.
  2. Choose the language from the list.
  3. If the language isn’t on the list, click Set Alternatives > Select a language to add, choose the language and click Add.
  4. Move the chosen language to the top and click OK.
  5. Close and reopen Thunderbird.
Thunderbird languages window with the Move Up, Move Down and Add buttons

Spell checking language

This is the language used to check the text you write.

  1. Go to Settings > Composition > Spelling.
  2. Choose the language from the list.
  3. If the language isn’t on the list, click Download More Dictionaries, download the dictionary you want and restart Thunderbird.
  4. Go back to Spelling and choose the downloaded language.