Duplicate Line Remover
Remove repeated lines and keep only unique entries
Everything runs in your browser. Your data never leaves your device.
Related tools
How to use
Paste your text into the input pane. Duplicate lines are removed immediately and the unique lines appear in the output, in their original order.
Paste your text
Enter any text with repeated lines in the left pane — one item per line works best.
Toggle case sensitivity if needed
Case insensitive (default) treats 'Apple' and 'apple' as duplicates. Enable case sensitive matching to keep both as distinct lines.
Copy the unique output
The deduplicated text appears on the right. Click Copy to grab it, or load the example to see the tool in action first.
Examples
Deduplicating a list of email addresses
Paste a list of email addresses collected from multiple sources. With case-insensitive matching enabled, 'User@example.com' and 'user@example.com' are treated as the same entry and only one is kept.
Cleaning up log output
Paste repeated log lines copied from a terminal. The duplicate remover strips all repeated entries, leaving a concise list of unique messages — useful for quickly scanning what events actually occurred.
About this tool
Remove duplicate lines from any text, keeping only the first occurrence of each unique line. A case-sensitive toggle lets you decide whether 'Apple' and 'apple' count as the same line. The original order of remaining lines is preserved. Useful for cleaning up lists, deduplicating log output, and removing repeated entries from copied data. Runs in your browser.