Duplicate Line Remover

Remove duplicate lines from text, keyword lists, CSV exports, and more. Clean your data instantly.

Instant Preserve Order Free

Remove Duplicate Lines

Input Text (one item per line)

Case Insensitive (Apple = apple) Trim Whitespace

Output (unique lines)

Your text never leaves your device. All processing is 100% local and private.

How to Use

Paste Your Text

Enter text with one item per line

Choose Options

Case sensitivity & whitespace trimming

Remove Duplicates

Click to deduplicate and see stats

Features

Preserve Order

Keeps first occurrence, removes later duplicates

Case Sensitive Option

Apple ≠ apple when case sensitivity is on

Trim Whitespace

Removes extra spaces before comparison

Use Cases

Email Lists

Remove duplicate email addresses from mailing lists

Keyword Research

Deduplicate keyword lists before analysis

CSV Cleanup

Remove duplicate rows from exported data

Code & Logs

Deduplicate log entries or code lines

Frequently Asked Questions

Does this preserve the original order?

Yes! The first occurrence of each line is kept, preserving the original order of your text.

What's the difference between case sensitive and insensitive?

Case sensitive treats 'Apple' and 'apple' as different. Case insensitive treats them as the same.

Does trim whitespace remove spaces?

Yes, it removes leading/trailing spaces before comparing lines. Useful for messy data.

Is there a file size limit?

No strict limit, but very large files may affect browser performance.

Related Tools