Duplicate Line Remover — Free Online Tool
Remove duplicate lines from text online for free. Sort, count duplicates, and clean lists of URLs, emails, keywords, or any text data instantly.
About Remove Duplicate Lines
Removing duplicate lines from large lists is a common task in data cleaning, SEO keyword management, email list management, and programming. Our duplicate remover scans your pasted text line by line, identifies and removes exact duplicates (with an option for case-insensitive matching), and outputs a clean list. Additional options include sorting the result alphabetically, counting how many duplicates were found, preserving blank lines, and trimming leading and trailing whitespace from each line before comparison.
Frequently Asked Questions
Is the comparison case-sensitive?
By default yes. Toggle case-insensitive mode to treat Apple and apple as duplicates.
Can I also sort the results?
Yes — sort alphabetically after removing duplicates.
Does it trim whitespace before comparing?
Yes — enable the trim option to strip leading and trailing spaces before comparison.
How many lines can it handle?
No hard limit — the tool processes hundreds of thousands of lines instantly.
Can I see how many duplicates were removed?
Yes — a summary shows the original line count, unique line count, and number of duplicates removed.