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Duplicate Line Remover

Q: What counts as a duplicate line?

A line matching another exactly (or case-insensitively). First occurrence kept, subsequent ones removed.

Q: Does it work with CSV data?

Yes, it deduplicates entire lines. For column-specific dedup you'd need a dedicated tool.

Q: Can I undo the operation?

No undo. Copy your original text before deduplicating if you might need it back.

Q: Is my data sent to a server?

No. All processing happens in your browser.

Remove duplicate lines from text instantly. Clean up lists, CSV data, logs, and more with one click.

Total Lines

Duplicates

Unique Lines

Removed

Case Sensitive Trim Whitespace Remove Empty Lines Sort Result

About This Duplicate Remover

This free online duplicate line remover cleans up text by removing repeated lines. Paste any text with duplicate entries, choose your options, and get clean, unique results instantly. Perfect for cleaning up email lists, log files, CSV data, keyword lists, and more.

Features

Instant Deduplication — Removes duplicate lines while keeping the first occurrence
Case Sensitivity Toggle — Treat "Apple" and "apple" as the same or different
Whitespace Trimming — Automatically trims leading/trailing spaces
Empty Line Removal — Optionally remove blank lines
Sort Results — Alphabetically sort the output after deduplication

How to Use

Paste your text with duplicate lines into the input area
Toggle options: case-sensitive, trim whitespace, remove empty lines, or sort as needed
Click Remove Duplicates to clean your text
Copy the cleaned result with one click

Frequently Asked Questions

What counts as a duplicate line?

A line is considered duplicate if it matches another line exactly (or case-insensitively if that option is on). The first occurrence is kept, and all subsequent matches are removed.

Does it work with CSV data?

Yes. Paste CSV data and it will deduplicate entire lines. For column-specific deduplication, you'd need a dedicated tool.

Can I undo the operation?

We recommend copying your original text before deduplicating if you might need it back. There's no undo, but you can re-paste.

Is my data sent to a server?

No. All processing happens entirely in your browser. Your data never leaves your device.