I use Notepad ++ for coding mostly.
How can I convert capital letters to lowercase and vice versa?
You could also, higlight the text you want to change, then navigate to - 'Edit' > 'Convert Case to' choose UPPERCASE or lowercase (as required).
Ctrl+A , Ctrl+Shift+U
should do the trick!
Edit: Ctrl+U is the shortcut to be used to convert capital letters to lowercase (reverse scenario)
First select the text
To convert lowercase to uppercase, press Ctrl+Shift+U
To convert uppercase to lowercase, press Ctrl+U
I had to transfer texts from an Excel file to an xliff file. We had some texts that were originally in uppercase but those translators didn't use uppercase so I used notepad++ as intermediate to do the conversion.
Since I had the mouse in one hand (to mark in Excel and activate the different windows) I disliked the predefined shortcut (Ctrl+Shift+U) as "U" is too far away for my left hand. I first switched it to Ctrl+Shift+X which worked.
Then I realized, that you can create macros easily, so I recorded one doing:
That macro got assigned that very shortcut (Ctrl+Shift+X) and made my life easy :)
Just select the text you want to change, right click and select UPPERCASE or lowercase depending on what you want.
In my notepad++ I press
Ctrl+A = To select all words
Ctrl+U = To convert lowercase
Ctrl+Shift+U = To convert uppercase
Hope to help you!