How does duplicate detection work?

Each line is compared against all previously seen lines. If a line has already appeared, it is removed. The first occurrence is always kept.

What does 'Case insensitive' mode do?

In case-insensitive mode, 'Apple' and 'apple' are treated as duplicates. The first occurrence (with its original casing) is kept.

What does 'Trim whitespace' do?

When enabled, leading and trailing spaces are removed from each line before comparison and output. This prevents ' apple ' and 'apple' from being treated as different lines.

Can I sort the output?

Yes. You can sort the unique lines alphabetically (A → Z) or reverse alphabetically (Z → A), or keep the original order.

Is my text stored anywhere?

No. All processing happens in your browser in real time. Your text is never sent to any server.

Does it preserve the original order?

Yes. The first occurrence of each line is kept in its original position.

Is the comparison case-sensitive?

You can toggle between case-sensitive and case-insensitive comparison.

Duplicate Line Remover — Remove Duplicate Lines Free Online

Remove duplicate lines from text. Sort and clean lists instantly. Free online duplicate line remover.

Sort

Comparison

Trim whitespaceRemove empty lines

Input (1 lines)

Output (0 unique lines)

100% Private

No Upload

Instant

What is Duplicate Line Remover?

A duplicate line remover finds and removes repeated lines from a block of text, leaving only unique lines. This is useful for cleaning up lists, removing duplicate entries from data exports, or deduplicating keyword lists.

How to Use Duplicate Line Remover

1Paste your text with duplicate lines.
2Click Remove Duplicates.
3Copy the cleaned text.

Key Features

Removes exact duplicate lines
Case-sensitive and case-insensitive options
Preserves original line order
Shows count of removed duplicates

Benefits

Clean up keyword lists for SEO
Deduplicate data exports
Remove repeated entries from any list

Use Cases

Remove Duplicate Lines Remove Duplicate Words

Why Use Irreva for Duplicate Line Remover?

Clean up keyword lists for SEO

Deduplicate data exports

Remove repeated entries from any list

Runs 100% in your browser — files never leave your device.

No account, no sign-up, no subscription — free forever.

Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

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