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On a Windows PC, hold down the Alt key and type the following numbers from the numerical keypad (with Num Lock on).
ä = Alt 132 Ä = Alt 142 ö = Alt 148
Ö = Alt 153 ü = Alt 129 Ü = Alt 154
ß = Alt 225
On any Macintosh, press the Option-key, the letter 'u' and then the vowel you want as an Umlaut.
For example, to get an ä, press Option-u a. The same goes for ü and ö.
To umlaut a capital letter, follow the same steps and press Shift-letter.
For example, to get an Ö , press Option-u O.
To get an ß, press option-s.
Alternatively, hold down the MAC key while typing these numbers:
Ä = 128 / ä = 138 / Ö = 133 / ö = 154 / Ü = 134 / ü = 159 / ß = 167