Deduplicate Lines is a free online tool that removes duplicate lines from text while preserving order. Supports case-sensitive matching, whitespace trimming, and empty line removal. Runs entirely in your browser.
What is Line Deduplication?
Line deduplication removes duplicate lines from text, keeping only the first occurrence of each unique line. The original order is preserved. Use the Email Extractor to pull unique addresses, or Word Counter to analyze the cleaned output.
How to Use
Paste your text in the input area. The result updates in real time. Use the options to control comparison behavior.
Case Sensitive: When checked, 'Hello' and 'hello' are treated as different lines.
Trim Whitespace: When checked, leading and trailing spaces are ignored during comparison.
Remove Empty Lines: When checked, empty lines and whitespace-only lines are removed.
Common Use Cases
Removing duplicate entries from log files.
Cleaning up configuration files with repeated directives.
Deduplicating rows in CSV data before processing.