Duplicate Line Remover
Remove duplicate lines from any list or block of text, keeping only unique entries — free and processed entirely in your browser.
About the Duplicate Line Remover
Cleaning up a list — email addresses, CSV rows pasted as text, log entries, keyword lists — often means finding and removing the same line repeated multiple times, which is tedious to do by hand once a list gets long. This tool does it instantly: paste your list and get back only unique lines.
Choose whether matching is case-sensitive, whether to trim extra whitespace before comparing, and whether to keep the original line order or sort the result. Everything runs locally in your browser; your text is never uploaded to a server.
How to Remove Duplicate Lines
Step 1
Paste your list
Paste any list or block of text, one entry per line.
Step 2
Choose your options
Set case sensitivity, whitespace trimming, and sort order.
Step 3
Copy the result
Copy your deduplicated list, ready to use anywhere.
Frequently Asked Questions
Is this case-sensitive?
You choose — toggle case-sensitive matching on if "Apple" and "apple" should count as different lines, or off if they should be treated as duplicates.
Does it keep the first or last occurrence of a duplicate?
The first occurrence of each line is kept, in its original position — later duplicates are removed.
Will this remove blank lines too?
There's a separate toggle for that — blank lines are handled independently from duplicate detection.
Is my text uploaded anywhere?
No. Deduplication happens entirely in your browser.