Duplicate Line Remover — Free Online Tool

Options

Case-insensitiveTreat "Hello" and "hello" as duplicates Trim whitespaceStrip leading/trailing spaces per line Remove blank linesDelete all empty lines from output Sort lines A–ZSort output alphabetically after dedup Sort lines Z–ASort output reverse alphabetically Keep only duplicatesShow lines that appeared more than once Prefix with countShow how many times each line appeared Live processingUpdate output as you type

Input

0 lines 0 unique 0 duplicates

Output

0 lines 0 removed

0Input Lines

0Unique Lines

0Duplicates Found

0Lines Removed

0%Reduction

When to use this tool

Paste any list — email addresses, URLs, keywords, product names, IDs — and remove duplicates in one click. Useful for cleaning data exports, deduplicating mailing lists, consolidating keyword research, or processing log files.

The case-insensitive option is especially useful for email lists where "User@Example.com" and "user@example.com" are the same address. The count prefix shows you which items were most repeated, useful for frequency analysis.