Remove Duplicate Lines
Remove duplicate lines, sort, and clean up your text data.
How to Remove Duplicate Lines
- Paste your list — paste any text list (one item per line) into the input box.
- Choose options — select case sensitivity, whether to trim whitespace, remove empty lines, and optionally sort alphabetically.
- Click "Remove Duplicates" — the deduplicated output appears with a count of lines removed.
- Copy the result — click Copy to copy the cleaned list to your clipboard.
Frequently Asked Questions
How does the duplicate line remover work? ▼
The tool processes your text line by line, keeping only the first occurrence of each line and discarding subsequent duplicates. The stats bar shows the original line count versus the result count and how many duplicates were removed.
What does case-sensitive mean? ▼
When case-sensitive is OFF (default), "Apple" and "apple" are treated as the same line — one is removed. When case-sensitive is ON, they are treated as different lines and both are kept. Turn it ON when exact casing matters.
Can I sort the results? ▼
Yes — tick "Sort alphabetically" to get a clean, sorted, unique list. This is especially useful for cleaning and organising keyword lists, email lists, or any data that benefits from alphabetical order.
What are common use cases? ▼
Common uses: removing duplicate emails from a mailing list, deduplicating keyword lists for SEO, cleaning URL lists, removing repeated log entries, deduplicating database exports, and processing any CSV column that should contain unique values.
Is there a line limit? ▼
No — the tool runs entirely in your browser and can process large files with thousands of lines instantly. There is no upload or character limit.