Replace newline character in notepad ++

Then select Search → Replace from the menu, or hit Ctrl-H. The Replace dialog will show up. Therein make sure that you fill out the following values; Find what: \\n (yes, two back-slashes), Replace with: \n (yes, just one back-slash), and the most important, make sure you select the Extended (\n, \r, \t, \0, \x, …) radio button.