How to convert from lower to upper case in Sublime 3

If you go to the Edit menu and select Convert Case you'll find several options, with the appropriate shortcuts listed next to them. Additionally, the Case Conversion plugin, available through Package Control, adds a number of additional options to this menu for converting variables, such as snake_case, camelCase, PascalCase, dot.case, and others.

if you need convert any text, select and press: ctrl + KU