Is this duplicate line remover really offline and private?

Yes! All processing happens in your browser. No data is sent to any server, ensuring full privacy.

Can I remove duplicate lines while ignoring case or whitespace?

Yes, you can enable options for case-insensitive matching, trimming whitespace, and removing empty lines.

Yes, simply check the 'Sort Result Alphabetically' option and the output will be sorted.

Yes, use the 'Copy Result' button to copy to clipboard or 'Download TXT' to save a text file.

Absolutely! The tool is fully responsive and works on all desktop, tablet, and mobile devices.

Best Free Duplicate Line Remover • Text Deduplicator • 100% Offline • Private

Case Insensitive (treat "ABC" and "abc" as duplicates)

Trim Whitespace (remove leading/trailing spaces)

Remove Empty Lines

Sort Result Alphabetically

Results update instantly as you type or change options

Instantly removes all duplicate lines while preserving original order (unless sorted)

All processing in your browser – no data sent to servers, fully secure

Case sensitivity, trim, empty lines removal, sorting – perfect for lists, keywords, emails

Beautiful dark theme, works flawlessly on desktop, tablet and mobile