Remove Duplicate Lines
Remove duplicate and repeated lines from text instantly — keep first occurrence or last, with optional sorting.
About Remove Duplicate Lines
Removing duplicate lines is a common data cleaning task. When importing data from spreadsheets, merging lists, processing log files, or combining text from multiple sources, duplicate entries are a frequent problem. This tool removes duplicate lines, keeping only the first occurrence of each unique line, while preserving the original order.
The case-insensitive option treats "Apple", "apple", and "APPLE" as duplicates. The trim option removes leading and trailing whitespace before comparison, so " hello " and "hello" are treated as duplicates. Together, these options handle the messy real-world data that comes from CSV exports, form submissions, and copy-pasted lists.