In Microsoft Excel there is no built in facility to change text case Upper case or Lower case. Instead Excel has built in functions to convert text in a cell to Upper or Lower or Proper case.

Text Case change functions in Excel.

LOWER Function

This function converts all uppercase letters in a text string to lowercase.

Usage: =lower(text/cell)

Eg:
Cell A1 contains text "THIS is my WeEBSITE", to convert this text on B1 type

=lower(A1)

and press enter.

The text will convert to "this is my website".



UPPER Function

UPPER function converts all lowercase letters in a text string to uppercase.

Usage: =upper(text/cell)

Eg:
Cell A1 contains text "This is my website", to convert this text on B1 type

=upper(A1)

and press enter.

The text will convert to "This is my website"



PROPER Function

This function converts first letter of all words on a text string into Upper case/capital and a other letters to lower case.

Usage: =proper(text/cell)

Eg:Cell A1 contains text "This is my website", to convert this text on B1 type

=proper(A1)

The text will convert to "This Is My Website"