Add Prefix and/or Suffix into Each Line Input Box Enter text for prefix and/or suffix insertion here. Add this prefix into the beginning of each line: Add this suffix into the end of each line: Output Box Modified text will display here after entering the prefix and/or suffix into their appropriate field and clicking the "Add Prefix and/or Suffix" button above. Privacy of Data: This tool is built-with and functions-in Client Side JavaScripting, so only your computer will see or process your data input/output. Unix Dos.