Remove duplicate lines
Remove duplicate lines, keep order.
About this tool
Remove duplicate lines from a list while keeping the order of the first occurrences. Perfect for cleaning email lists, keywords and logs.
Why use it
- Strips repeats so each line appears only once.
- Preserves the original order of unique entries.
- Handles long lists instantly in the browser.
Common use cases
- Clean a mailing list of repeated addresses.
- Deduplicate a keyword list for SEO.
- Collapse repeated log lines into unique entries.
Tips
- Trim trailing spaces first; otherwise near-identical lines survive.
- Sort afterwards if you also want the list ordered.
How to use
- Paste text.
- Remove duplicates.
FAQ
- What does removing duplicate lines do?
- It keeps the first occurrence of each line and drops the repeats.
- Is my text sent to a server?
- No. Deduplication runs in your browser.
- Is matching case-sensitive?
- You can choose whether lines that differ only in case count as duplicates.
- Does it keep the original order?
- Yes, the first time a line appears sets its position.
- Will leading spaces affect matching?
- Trim your text first if whitespace should be ignored when comparing.
- Good for cleaning email or keyword lists?
- Yes, it is ideal for removing repeats from any line-based list.