Elimina líneas duplicadas de tu texto al instante. Conserva la primera, la última o elimina todas las duplicadas. Solo en el navegador.
Duplicate Line Remover is a free online text deduplication tool that instantly removes duplicate lines from any text. Whether you are cleaning up a mailing list, deduplicating a dataset, or organizing a list of items, this tool handles it all with a single click. It offers three deduplication modes: keep the first occurrence, keep the last occurrence, or remove all duplicates entirely. Additional options include case-sensitive matching, whitespace trimming, and empty line removal. All processing happens 100% client-side in your browser — your text never leaves your device, ensuring complete privacy and security.
Keep First preserves the first occurrence of each duplicate line and removes subsequent duplicates. Keep Last preserves the final occurrence and removes earlier ones. Remove All deletes every line that appears more than once, leaving only truly unique lines.
Yes. With case sensitivity enabled, "Apple" and "apple" are treated as different lines. With case sensitivity disabled, they are treated as duplicates. Choose based on your data requirements.
When enabled, leading and trailing spaces are ignored when comparing lines. This means " hello " and "hello" are treated as duplicates. The output still preserves your original formatting unless empty lines are also removed.
Absolutely. All processing happens entirely within your web browser. Your text is never uploaded to any server, stored in any database, or transmitted over the network. This makes the tool completely safe for sensitive data including personal information and proprietary content.
There is no fixed limit. The tool can handle thousands of lines instantly. The only constraint is your browser's memory. For extremely large files (hundreds of thousands of lines), performance may vary depending on your device.
The tool does not have a built-in undo function. However, your original text remains in the input panel until you clear it. You can always re-paste your original data and try different settings.
Yes. Once the page is loaded, all processing happens locally in your browser. No internet connection is required to use the tool, making it ideal for use on airplanes or in secure environments.