About German letters
German needs the three umlauts ä, ö, ü and the eszett ß. Capital ẞ exists since 2017 but SS is still accepted.
If you cannot type an umlaut, the spelling ae, oe, ue and ss is an accepted substitute.
On a Mac, Option+U then the vowel gives the umlaut; Option+S gives ß. The German layout (QWERTZ) has ä, ö, ü as dedicated keys.
German letters: names and codes
Every special letter in German, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.