Add Prefix or Suffix
Add consistent text before or after every non-empty line and export the transformed list.
Runs locallyUndo-friendly inputCopy or download
Ready. Your input stays in this browser tab.
Only in second list 0
Result 0
How it works
The operation is deterministic: options are applied before comparison or transformation, and the visible counts describe the final output rather than the raw textarea length.
Privacy
JavaScript processes the text in this tab. The form has no POST target, working text is not placed in the URL, and copied/downloaded output is initiated by you.
Bounded large lists
Text input is capped at five million characters and expensive similarity analysis is capped at 500 unique rows, preventing one tab from exhausting the device.