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Remove Duplicate Lines

Remove repeated lines from any text, keeping only unique lines.

Case Insensitive Trim Whitespace Remove Blank Lines

Input

Output

How to Use

Paste your linesPaste a list of lines (email list, keywords, data) into the Input field.

Set optionsChoose case sensitivity, whitespace trimming, and blank line removal.

Click Remove DuplicatesDuplicate lines are filtered out, keeping the first occurrence.

Copy resultClick "Copy Result" to copy the unique lines to your clipboard.

Check the countThe status bar shows how many duplicates were removed.

📌 All processing happens locally. Your data is never uploaded to any server.

About Remove Duplicate Lines

Remove Duplicate Lines is a free online text utility that lets you remove repeated lines from any text, keeping only unique lines instantly in your browser. Writers, editors, students, and content creators use this tool daily to save time on repetitive text manipulation tasks. No data is sent to any server — everything is processed locally on your device.

Frequently Asked Questions

Yes. The tool keeps the first occurrence of each line and removes subsequent duplicates, preserving the original order of unique lines.

When enabled, "Hello" and "hello" are treated as the same line, and the duplicate (second occurrence) is removed. The first occurrence's original casing is preserved.

Yes, check "Remove Blank Lines" to also filter out empty or whitespace-only lines from the result.

Common uses include cleaning email lists, deduplicating keyword lists, removing repeated log entries, cleaning CSV data, and consolidating lists from multiple sources.