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Set up a Japanese input source on Mac
If you set up the Hiragana, Katakana, or Romaji input mode, you can type in Japanese.
On your Mac, choose Apple menu
Click the Add button
, select Japanese (on the left), then select any of the following:Japanese - Kana
Japanese - Romaji
Tip: The Romaji typing method is useful when you’re not using a Japanese keyboard; text you type is automatically converted to hiragana.
Click Add.
After you add a Japanese input source, you can change preferences, for example, to select input modes or show predictive text completion candidates.
Note: If your Mac has a Touch Bar, you can customize the Control Strip by adding the Input Sources button 
. See Customize the Touch Bar.