Remove Duplicate Lines
Deduplicate text lines instantly. Handles case sensitivity, whitespace trimming, and alphabetical sorting. Processes huge lists in your browser.
- 100% free
- No sign-up
- No limits
- Instant results
- Remove duplicate lines in one click
- Case-sensitive or case-insensitive matching
- Optional whitespace trimming
- Optional alphabetical sorting
- Handles thousands of lines instantly
What is Remove Duplicate Lines?
The Remove Duplicate Lines tool scans your text line by line and eliminates all repeated entries, leaving only unique lines.
This is essential when working with large data lists, log files, CSV exports, email lists, keyword lists, or any text where duplicates creep in. You can control whether comparison is case-sensitive (so 'Apple' and 'apple' are treated as the same or different), trim leading and trailing whitespace from each line before comparing, and optionally sort the results alphabetically. All processing happens instantly in your browser — even lists with thousands of lines are deduplicated in milliseconds. No data is sent to any server.
How to use Remove Duplicate Lines
- 1
Paste your text
Paste or type your list of lines into the input area. Each line is treated as one entry.
- 2
Configure options
Toggle case-sensitive matching, whitespace trimming, and alphabetical sorting based on your needs.
- 3
Review the stats
The stat cards show original line count, unique lines, and how many duplicates were removed.
- 4
Copy the result
Click Copy to copy the deduplicated text to your clipboard.
Everything this tool
does for you
- Instant duplicate line removal
- Case-sensitive or case-insensitive comparison
- Whitespace trimming before comparison
- Optional alphabetical sorting of results
- Shows original, unique, and removed counts
- Handles thousands of lines instantly
- One-click copy to clipboard
Related free tools
Frequently asked questions
This tool fixed one thing.
Now fix the whole site.
Our scanner runs 240+ checks across 10 audit areas, ranks every issue by the score points it costs, and hands you the code to paste.
Run a free audit