Does it remove empty lines?

Empty lines are treated as valid lines. If you have multiple empty lines, all but one will be removed if they are duplicates.

Is it case sensitive?

By default, no (A = a). You can enable "Case Sensitive" to treat "Text" and "text" as different lines.

Does it sort the output?

No, this tool preserves the original order of the first occurrence of each line. Use the "Sort Lines" tool if you need sorting.

Remove Duplicate Lines

Free online tool to remove duplicate lines from text. Clean up lists, data sets, and logs instantly. Supports case sensitivity and whitespace trimming options. Get unique lines in seconds.

100% Private (In-Browser)Instant Web Worker SpeedZero Server Upload

Remove Duplicate Lines by Privacy-First Toolbox is a 100% free, client-side browser utility. It processes your files locally on your computer or smartphone using HTML5 and Web Workers—zero bytes of your files or data are ever uploaded to any external server.

Total Lines

Unique

Removed

Case Sensitive

Trim Whitespace

Source Text (0 lines)

Unique Output (0 lines)

Key Features

Instant deduplication
Case sensitive option
Trim whitespace support
Original vs Unique stats
Copy result instantly
100% private

Common Use Cases

Clean email lists
Deduplicate data logs
Filter unique values
Prepare data for Excel/CSV

Frequently Asked Questions

🔒100% Client-Side: Your data never leaves your device.

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