Original List
0 Lines
Unique List
0 Lines
0 duplicates removed.
How to Remove Duplicate Lines Online
Cleaning up data is a tedious task. Whether you are an email marketer cleaning a subscriber list, an SEO professional consolidating keywords, or a developer formatting a database export, duplicate entries can skew your data and waste resources. Our Duplicate Line Remover handles lists of 100,000+ items instantly in your browser.
Key Features
- Instant Deduplication: Uses the advanced JavaScript `Set` data structure to identify uniques in O(n) time.
- Privacy Focused: Your data is processed 100% client-side. No lists are uploaded to our server.
- Download Ready: Export your cleaned list as a `.txt` file with one click.
- Whitespace Only Mode: Automatically removes empty lines to keep your file compact.
Common Use Cases
Email Marketing
Merge multiple lead lists and ensure you never annoy subscribers by emailing them twice.
SEO Keyword Research
Combine keywords from Ahrefs, SEMrush, and GSC, then remove duplicates to find the true Total Search Volume.
Database Imports
Sanitize CSV or SQL dump data before importing to avoid Primary Key constraint errors.