Remove Duplicate Lines
Delete repeated lines.
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About Remove Duplicate Lines
Remove Duplicate Lines cleans up any list of text by deleting repeated lines and keeping only the first occurrence of each, preserving the original order. Options let you match lines case-insensitively, trim whitespace from each line before comparing, and strip out blank lines, with live counts of original, unique, and removed lines.
The tool is completely free with no sign-up, limits, or watermarks. It runs entirely in your browser using plain JavaScript, so your text never leaves your device or gets uploaded to any server. Paste your list, toggle the options you need, and copy the deduplicated result instantly.
Frequently asked questions
- Is this duplicate line remover free to use?
- Yes, it is completely free with no sign-up, no usage limits, and no watermarks. Use it as many times as you like.
- Is my data uploaded to a server?
- No. All processing happens locally in your browser using JavaScript. Your text is never sent, stored, or uploaded anywhere, so it is safe for sensitive or private lists.
- Does it keep the original order of my lines?
- Yes. The tool keeps the first occurrence of each line in its original position and only removes the later duplicates, so the order you pasted is preserved.
- What does the case-insensitive option do?
- When enabled, lines that differ only in letter case (for example 'Apple' and 'apple') are treated as duplicates, and only the first is kept. When off, case must match exactly for a line to count as a duplicate.
- What do 'trim each line' and 'remove blank lines' do?
- 'Trim each line' removes leading and trailing spaces before comparing, so lines that differ only by whitespace are treated as identical. 'Remove blank lines' deletes empty lines entirely from the output.
- Can I copy the cleaned-up result?
- Yes. Once duplicates are removed, click the Copy result button to copy the unique lines to your clipboard. You will see a brief 'Copied!' confirmation.