Remove Duplicate Lines
Paste a messy list and instantly remove duplicate lines, keeping only the first occurrence of each unique entry.
What Is the Remove Duplicate Lines?
The Remove Duplicate Lines tool scans a block of text line by line and strips out any repeated lines, keeping only the first occurrence of each unique entry. It's a fast way to clean up email lists, keyword lists, log files, or any pasted data where duplicates have crept in.
You can choose whether the comparison should be case-sensitive (so "Apple" and "apple" are treated as different lines) and whether leading/trailing whitespace should be trimmed before comparing. The tool also shows exactly how many duplicate lines were removed, so you know at a glance how messy your original list was.
How To Use the Remove Duplicate Lines
Paste your list — Add your list, one item per line, into the input box.
Adjust matching options — Toggle case sensitivity and whitespace trimming to control how duplicates are detected.
Copy your cleaned list — Copy or download the deduplicated result once it looks right.
Key Benefits
🧹 Instantly Clean Lists
Remove duplicate entries from messy lists in a single click.
⚙️ Configurable Matching
Choose case-sensitive or case-insensitive comparison to fit your data.
📊 See What Was Removed
A live counter shows exactly how many duplicate lines were stripped out.
⬇️ Download Ready
Export your cleaned list as a .txt file for use elsewhere.
Example Output
Features
- Removes duplicate lines while preserving original order
- Optional case-sensitive matching
- Optional whitespace trimming before comparison
- Live count of duplicates removed
- One-click copy and .txt download
Frequently Asked Questions
The tool keeps the first occurrence of each unique line and removes any later duplicates, preserving your original list order.
Yes, toggle 'Case sensitive' on to treat differently-cased lines as unique, or leave it off to treat them as duplicates.
Yes, multiple blank lines are treated as duplicate empty lines and will be reduced to a single blank line unless trimming settings change that.
This free duplicate line remover instantly cleans lists, keyword sets and pasted data of repeated entries.