Remove Duplicate Lines
Instantly remove duplicate lines from your text. Perfect for cleaning up lists, data files, code, and more. Keep only unique lines.
Frequently Asked Questions
Is this duplicate line remover free?
Yes! Our duplicate line remover is completely free with no registration, limits, or hidden fees. Process unlimited text files.
How does the duplicate detection work?
The tool compares each line with all previous lines. When a duplicate is found, it's removed, keeping only the first occurrence. You can control case sensitivity and whitespace handling.
Is my data safe and private?
Absolutely. All duplicate removal and text processing happens entirely in your browser using JavaScript. We don't send, store, or process your text on our servers.
What does 'case sensitive' mean?
When case sensitive is enabled, 'Hello' and 'hello' are treated as different lines. When disabled, they're considered duplicates and only one is kept.
Can I use this for large files?
Yes! The tool works entirely in your browser, so there are no server-side file size limitations. However, very large files may take longer to process depending on your device.