Duplicate Line Remover
Remove duplicate lines from text lists, CSV records, and logs. Options for case-sensitive deduplication, sorting alphabetically, and stripping empty lines.
What is Duplicate Line Remover?
Duplicate Line Remover is a data-cleaning utility that filters out repetitive lines from lists, log files, email rosters, and keyword collections.
How Duplicate Line Remover Works
The tool splits input into lines, passes them through a JavaScript `Set` data structure for O(N) deduplication, and optionally trims whitespace, filters empty rows, and sorts the output alphabetically.
Key Features
- ✓Instant count of original vs unique lines remaining
- ✓Optional alphabetical A-Z sorting
- ✓Case-insensitive matching toggle
- ✓Empty line removal option
Common Use Cases
- •Cleaning email marketing lists and customer rosters
- •Deduplicating IP addresses, error codes, and query strings from web server logs
- •Sorting and cleaning SEO keyword lists
Examples & Sample Data
Deduplicating Email List
alex@example.com
sam@example.com
alex@example.com
chris@example.comalex@example.com
sam@example.com
chris@example.com (Removed 1 duplicate)Extracts unique items while preserving list order.
100% Client-Side Privacy Guarantee
List deduplication runs 100% locally in browser memory.
How to Use Duplicate Line Remover
- 1
Paste your multi-line list into the input box.
- 2
Configure deduplication options (case sensitivity, sorting).
- 3
Click 'Remove Duplicates' and copy your clean list.