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Remove Duplicate Lines

Delete repeated lines instantly

Paste a list or any block of text and remove duplicate lines in one click. Choose case sensitivity, trimming, and which copy to keep, then copy the unique result.

Unique lines
Your unique lines will appear here.

About the remove duplicate lines

The remove duplicate lines tool scans your text and deletes any line that appears more than once, leaving only unique lines behind. It is perfect for cleaning up email lists, product catalogs, log files, spreadsheets pasted as text, or any list where duplicates have crept in.

You control how duplicates are detected. Toggle case sensitivity so that "Apple" and "apple" are treated as the same or different, trim whitespace before comparing so indented lines match, and choose whether to keep the first or last occurrence of each line.

Common uses

  • Deduplicating email addresses, usernames, or ID lists.
  • Cleaning product lists and inventory pasted from spreadsheets.
  • Removing repeated entries from log files.
  • Building unique keyword or tag lists.

How to use the remove duplicate lines

  1. Paste your text

    Add the list or text block into the input box — one item per line.

  2. Set the options

    Toggle case sensitivity, line trimming, and whether to keep the first or last copy of each duplicate.

  3. Copy the unique lines

    The deduplicated result appears below with a count of removed lines — click Copy to use it.

Frequently asked questions

Does it keep the order of my lines?
Yes. Lines stay in their original order (or reversed if you choose to keep the last occurrence) — only duplicates are removed.
What does case sensitivity do?
When on, "Apple" and "apple" are treated as different lines. When off, they are considered duplicates and only one is kept.
Does it store my text?
No. Your text is processed entirely in your browser and is not sent to a server or saved anywhere.
Are blank lines treated as duplicates?
Yes. Multiple blank lines are treated as repeated empty lines, so only one blank line is kept by default.
Is the tool free?
Yes, it is completely free and requires no account or sign-up.

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