Remove Duplicate Lines - Free Online Deduplicator
Remove Duplicate Lines
Deduplicate a list, or isolate what repeats
Three Modes
Remove duplicates, show only the lines that repeat, or show only the lines that appear exactly once.
Fuzzy Matching
Ignore letter case and stray spaces so Apple, apple and apple count as the same line.
Original Order Kept
Lines stay in the order you pasted them. Pick whether the first or the last copy of each duplicate survives.
Full Privacy
Your list never leaves your browser. Nothing is uploaded or stored.
Why Remove Duplicate Lines?
Duplicates creep into exported email lists, keyword research, server logs, URL inventories and copied spreadsheet columns. Removing them keeps mailings from going out twice, shrinks files, and makes the remaining data reliable to count and compare.
The duplicates only mode is just as useful: paste a list that should be unique, such as order numbers or IDs, and see immediately which values were entered more than once.
Key Takeaways
- Precise: Matching is exact unless you turn on the case or whitespace options.
- Transparent: Counts show how many lines were read, kept and removed.
- Fast: Handles tens of thousands of lines instantly.