Remove Duplicate Lines
Paste your text below and instantly remove duplicate lines while keeping the first occurrence of each.
- Input lines
- 0
- Output lines
- 0
- Duplicate lines removed
- 0
CleanTextly's Remove Duplicate Lines tool scans any block of text and strips out repeated lines, keeping only the first occurrence of each one — instantly, right in your browser. Paste a list, a log file, or an exported spreadsheet column, and watch duplicates disappear as you type. Nothing you paste is ever uploaded, so it's safe for anything from a mailing list to internal notes.
Features
Instant Deduplication
Duplicate lines are removed live as you type or paste — there's no button you have to click to see the result.
Keeps First Occurrence, Preserves Order
When a line repeats, only the first time it appears is kept, and every remaining line stays in its original relative order.
Optional Whitespace & Empty Line Handling
Turn on "Trim whitespace" to treat lines that differ only by leading or trailing spaces as duplicates, or "Ignore empty lines" to strip blank lines entirely.
Live Statistics
See Input Lines, Output Lines, and Duplicate Lines Removed update in real time as you edit your text.
100% Private
Everything runs locally in your browser. Your text is never uploaded, logged, or stored anywhere.
How to Use
- 1
Paste your text
Add the text you want to deduplicate into the input box.
- 2
Choose your options
Optionally enable "Ignore empty lines" or "Trim whitespace" before lines are compared.
- 3
Review the live result
Duplicate lines are removed instantly, and the line-count stats update as you type.
- 4
Copy or clear
Copy the cleaned text with one click, or clear both fields to start over.
Example
Removing Duplicate Emails from a List
Input
alice@example.com bob@example.com alice@example.com carol@example.com bob@example.com
Output
alice@example.com bob@example.com carol@example.com
Common Use Cases
Cleaning Email & Contact Lists
Remove repeated email addresses or names before importing a list into a CRM or mailing tool.
Deduplicating Data Exports
Clean up duplicate rows, IDs, or values copied from spreadsheets, logs, or database exports.
Tidying Keyword & Tag Lists
Remove duplicate keywords, tags, or hashtags before using them in SEO or content tools.
Simplifying Code & Config Lists
Strip duplicate lines from import statements, dependency lists, or configuration files.
Frequently Asked Questions
Yes. When a line repeats, only its first occurrence is kept, and every remaining line stays in its original position relative to the others.
Yes. Turn on "Ignore empty lines" to strip every blank line from the output, no matter how many appear in your original text.
Only if you enable "Trim whitespace" — this treats lines that differ only by leading or trailing spaces as the same line before comparing them.
Yes, comparison is always case-sensitive, so "Apple" and "apple" are treated as two different lines. There's currently no option to ignore case.
Input Lines is the total number of lines you pasted, Output Lines is how many remain after deduplication, and Duplicates Removed is how many repeated lines were stripped out.
No. Deduplication happens entirely in your browser. Your text is never sent to a server or stored.