Remove Duplicate Lines
Paste a list of lines and instantly remove all duplicates, keeping only unique lines.
Why Remove Duplicate Lines?
Duplicate lines commonly appear when merging data from multiple sources, exporting lists from databases, or combining text files. Removing duplicates manually is tedious and error-prone, especially in large datasets. This tool removes them instantly, preserving the original order of first occurrences.
Common Use Cases
- Cleaning email lists — Remove duplicate email addresses from a mailing list before sending a campaign.
- Deduplicating keyword lists — SEO and PPC professionals often need to deduplicate keyword lists assembled from multiple tools.
- Merging log files — When combining log entries from multiple servers, duplicate lines frequently appear.
- Cleaning up data exports — Remove duplicate rows from CSV or TSV data before importing into a database.
Case-Sensitive vs. Case-Insensitive
By default, the tool performs a case-sensitive comparison, meaning Apple and apple are treated as different lines. Uncheck the "Case-sensitive comparison" option to treat them as duplicates and keep only the first occurrence.