How to convert all text to lowercase in Vim

Question

How do you convert all text in Vim to lowercase? Is it even possible?

Answer 1

• Toggle case "HellO" to "hELLo" with g~ then a movement.
• Uppercase "HellO" to "HELLO" with gU then a movement.
• Lowercase "HellO" to "hello" with gu then a movement.

For examples and more info please read this: http://vim.wikia.com/wiki/Switching_case_of_characters