Change EOL on multiple files in one go

Question

Is there any way in Notepad++ (or even with another tool) to change the line ending automatically on multiple files in one go?

i.e. convert a mix of

Answer 1

Use the 'Find In Files' feature (Ctrl + Shift + F). Change the search mode at the bottom left to 'Regular Expression'.

In the 'Find what' box, use this pattern:

(?<!\r)\n

Replace with:

\r\n

Choose your directory and specify any file type filters. Check 'In all sub-folders' if you want. Click 'Replace in Files'.

What this does is replace any newline characters (\n) that are not currently preceded by a carriage return (\r) with \r\n. So it won't match line endings that are already Windows style.