Why remove duplicate lines?
When working with lists — email addresses, URLs, product names, log entries, or data exports — duplicates creep in easily. Manually scanning hundreds or thousands of lines is tedious and error-prone. This duplicate line remover processes your text in milliseconds, keeping only the first occurrence of each unique line.
Flexible matching
Enable case sensitive mode to treat "Apple" and "apple" as different entries, or disable it to merge them. The trim whitespace option strips leading and trailing spaces before comparing, so " hello " and "hello" are treated as the same line. Optionally sort the output alphabetically for a cleaner result.
Browser-based privacy
Your text never leaves your device. All deduplication runs locally in JavaScript, making this tool safe for sensitive data like email lists or internal records.