Remove Duplicate Lines
Instantly deduplicate text — sort, trim, and clean in one click
9
Input Lines
5
Unique Lines
4
Removed
Input
Unique Lines
About the Duplicate Line Remover
This tool removes duplicate lines from text, keeping the first occurrence of each so the original order survives. Optional whitespace trimming and case-insensitive matching catch the near-duplicates that differ only by a stray space or a capital letter, which exact matching would miss.
Remove duplicate lines whenever lists get combined. Merged email exports, keyword research from several tools, log files concatenated together, or a URL list assembled from multiple crawls all end up with repeats.
The options exist because exact matching misses most real duplicates. " [email protected]" and "[email protected]" differ by one space; "[email protected]" differs by case. Trimming whitespace and ignoring case first is usually what you actually want.
The first occurrence of each line is kept so the original order survives, and sorting alphabetically afterwards is optional. Empty lines can be dropped in the same pass. Everything runs in your browser, which matters for email lists and customer data.
How to use the Duplicate Line Remover
- Paste your list. Enter the lines you want deduplicated.
- Set the matching options. Turn on trimming and case-insensitive matching to catch near-duplicates.
- Remove duplicates. The first occurrence of each line is kept.
- Sort and copy. Optionally sort alphabetically, then copy the clean list.
Duplicate Line Remover features
- Case sensitivity options
- Whitespace handling
- Order preservation
- Count duplicates
- Copy results
- Large text support
Frequently asked questions
How do I remove duplicate lines?
Paste your text and the tool automatically removes duplicate lines while preserving the original order.
Can I control case sensitivity?
Yes! Choose between case-sensitive or case-insensitive duplicate detection.
What about whitespace?
Optionally trim whitespace from lines to identify duplicates that differ only by spacing.