Remove Duplicate Lines
Input Text
Output
Free Online Duplicate Line Remover
Our duplicate line remover instantly cleans any text list by removing all repeated lines and keeping only unique entries. Whether you have a list of email addresses, URLs, keywords, names or any other data with duplicates — paste it in and get a clean unique list in one click.
With options to ignore case (treating "Apple" and "apple" as duplicates), trim extra spaces, remove blank lines, and sort the result alphabetically — our tool handles all common deduplication scenarios without any manual work.
Common Use Cases
Email lists: Remove duplicate email addresses before sending a newsletter. Keywords: Clean up keyword lists for SEO research by removing repeated terms. URLs: Deduplicate URL lists for web crawling or link analysis. Names: Remove duplicate names from imported CSV data. Log files: Extract unique error messages from application logs. Coding: Remove duplicate entries from any plain-text data file.
Frequently Asked Questions
How do I remove duplicate lines from a text file?
Open your text file, select all and copy the contents. Paste into our tool above and click Remove Duplicates. The output will have all duplicate lines removed. Click Download to save the result as a .txt file.
What does Ignore Case mean?
When Ignore Case is enabled, "Apple" and "apple" and "APPLE" are all treated as the same line — so only one is kept. When it is disabled, case differences are treated as different lines and all three would be kept.
Will the tool remove blank lines too?
Yes. The Remove Blank Lines option is enabled by default. It removes all empty lines from the output. Uncheck it if you want to preserve the spacing between entries.
Is this duplicate line remover free?
Yes, completely free. No account, no line limit, no watermark. Your text is never sent to any server — everything is processed locally in your browser.