Windows
Hold Alt and type 0255 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All Y accentsHold Alt and type 0255 on the numeric keypad.
Option + U, then Y
Ctrl + Shift + :, then y — or type 00FF then Alt + X
Insert → Special characters → y diaeresis
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 0255, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+00FFÿÿ\00FF\u{00FF}Alt + 0255