Deduplicate Lines — Free Online Tool
Remove duplicate lines from any text. Handles case-insensitive comparison, optional whitespace trimming before comparison, and preserves original order or re-sorts. Shows count of removed lines.
100% client-side. No uploads. Your data never leaves your browser.
How to use Deduplicate Lines
- Paste text with duplicate lines.
- Adjust options (case sensitivity, trimming).
- Click Remove Duplicates.
Frequently Asked Questions
Does this preserve order?
Yes by default — first occurrence is kept, subsequent duplicates removed. Uncheck 'Preserve order' to sort alphabetically.
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