Remove Duplicate Lines
Clean up text lists instantly. Remove duplicate lines, empty lines, and keep only unique entries.
Input Text
Unique Lines
Why Remove Duplicate Lines?
Clean Data Fast
Instantly remove duplicate entries from lists, databases, email contacts, and text documents.
Multiple Options
Choose case-sensitive, case-insensitive, remove empty lines, or keep only duplicates for analysis.
100% Private
All processing happens in your browser. Your data never leaves your device or gets stored.
What is a Duplicate Line Remover?
A duplicate line remover is a text processing tool that identifies and eliminates repeated lines from your text, leaving only unique entries. It's essential for cleaning up lists, removing redundant data, and organizing information efficiently.
Whether you're managing email lists, cleaning up code, organizing data exports, or processing text files, this tool saves hours of manual work by automatically detecting and removing duplicates while preserving the original order.
Removal Methods Explained
- Remove Duplicates:Removes exact duplicate lines (case-sensitive)
- Case Sensitive:Treats "Hello" and "hello" as different lines
- Case Insensitive:Treats "Hello" and "hello" as duplicates
- Remove Empty Lines:Removes all blank lines from text
- Remove Both:Removes duplicates and empty lines together
- Keep Only Duplicates:Shows only lines that appear multiple times
Common Use Cases
Email List Cleanup
Remove duplicate email addresses from mailing lists, contact databases, and subscriber lists to improve deliverability.
Data Processing
Clean up CSV exports, database dumps, log files, and data exports by removing duplicate entries.
Code Cleanup
Remove duplicate import statements, CSS rules, configuration entries, and redundant code lines.
URL Lists
Clean up bookmark exports, sitemap entries, link lists, and web crawler outputs by removing duplicates.
Inventory Management
Remove duplicate product IDs, SKUs, serial numbers, and inventory item lists for accurate tracking.
Contact Lists
Merge and deduplicate phone numbers, addresses, customer names, and contact information from multiple sources.
How to Remove Duplicate Lines
Paste Your Text
Copy and paste or type the text with duplicate lines into the input box.
Choose Removal Method
Select case-sensitive, case-insensitive, or remove empty lines based on your needs.
View Clean Results
Cleaned text appears instantly in the output area showing only unique lines.
Copy or Download
Click Copy to copy to clipboard or Download to save as a text file.
Frequently Asked Questions
Is this tool free to use?
Yes, completely free with unlimited use. No registration or payment required.
What's the difference between case-sensitive and case-insensitive?
Case-sensitive treats "Hello" and "hello" as different lines. Case-insensitive treats them as duplicates.
Can I remove duplicate lines from large files?
Yes! The tool handles large text files efficiently with no length limits.
Does it preserve the original line order?
Yes, the first occurrence of each unique line is preserved in its original position.
Is my data private and secure?
All processing happens in your browser. Your text never leaves your device or gets stored on servers.
Can I remove empty lines too?
Yes! Use the "Remove Empty Lines" option or "Remove Duplicates & Empty" to clean both at once.
What does "Keep Only Duplicates" do?
It shows only lines that appear more than once in your text, useful for finding repeated entries.
Can I use this for cleaning email lists?
Yes! Perfect for cleaning email lists, contact databases, and removing duplicate entries from any list.
Start Cleaning Your Lists Now
Whether you're managing email lists, cleaning data exports, organizing contact databases, or processing text files, our free duplicate line remover makes it effortless. Save hours of manual work and eliminate errors with instant, accurate duplicate removal.
Simply paste your text, choose your preferred removal method, and get clean, unique results instantly. No downloads, no registration - completely free forever.