Type roman strings using hiragana or katakana on Mac
You can convert hiragana to roman characters.
Automatically type common roman strings
When you type well-known roman strings that contain punctuation, such as http:, www., and file:, they’re automatically converted to roman characters using the Romaji input mode.
On your Mac, set up and switch to a Japanese input source.
In an app, type a common roman string (such as http:).
Press Return to confirm the conversion and return to the input mode you were using.
For example, if you’re using the Hiragana input mode and you type “koreha,http:” (これは、hっtp:), when you type the colon (:), the input mode changes to Romaji; when you press Return to confirm the conversion, the input mode reverts to Hiragana.
Use Windows-like shortcuts to enter Romaji mode and type roman characters
On your Mac, set up and switch to a Japanese input source.
Click the Input menu in the menu bar, then choose Open Japanese Preferences.
Select “Windows-like shortcuts.”
In an app, as you type text, press the Shift key to enter Romaji mode.
In Romaji mode, press and hold the Shift key, then enter a letter.
A roman character appears in the text field.
Press Return to confirm the conversion and return to the input mode you were using.
The Caps Lock key automatically converts roman characters to uppercase characters. To enter lowercase roman characters, make sure the Caps Lock key is not pressed.