Remove Duplicate Lines

Delete all duplicate lines

Case sensitive

Input lines: 0 | Deleted lines: 0 | Output lines: 0

Details

Remove Duplicate Lines

Looking for a fast and private way to remove duplicate lines from text? This tool cleans your data instantly—directly in your browser, with zero uploads.

How to Remove Duplicate Lines?

To remove duplicate lines, simply paste your text into the input area.
The tool automatically detects repeated lines and keeps only unique entries in real time—no uploads, or waiting.

Paste text and remove duplicate lines instantly — Paste your text → duplicates are removed → copy clean output

Paste your text into the input field.
Click Remove Duplicate lines
The result with duplicate lines removed
Copy the result or download it as a .csv file.

🔒 Privacy Note: All processing happens locally in your browser. No data is sent to our servers.

Case Sensitive vs Case Insensitive — What’s the Difference?

You can control how duplicate lines are detected by choosing between Case Insensitive (default) and Case Sensitive modes. This option determines whether letter casing (A ≠ a) is considered when removing duplicates.

Case insensitive duplicate removal where text with different letter casing is treated as the same — Case Insensitive (default): “Apple”, “apple”, and “APPLE” are treated as the same line.

Case sensitive duplicate removal where text with different letter casing is treated as unique — Case Sensitive: “Apple”, “apple”, and “APPLE” are kept as separate lines.

Case Insensitive (default): Ignores letter casing when detecting duplicates.
Case Sensitive: Considers uppercase and lowercase letters as different.
Ideal for handling code, usernames, IDs, or text where case matters.

💡 Tip: Leave Case Insensitive enabled for most text cleanup tasks. Enable Case Sensitive only when letter casing is important.

How to Check Duplicate Lines?

You can analyze duplicate lines by switching to Details mode,
The tool scans your text and shows which lines repeat and how often, making it easy to extract or review duplicates.

Check duplicate lines and frequency counts — View duplicate lines with frequency analysis

Enable Details mode.
Paste your text to see repeated lines and counts.
Export specific duplicate sets for further analysis.

What Are the Line Counts & Statistics?

After processing your text, the tool provides clear statistics so you understand exactly what changed.

Line count statistics showing input lines, deleted duplicate lines, and final unique output lines — Line count statistics displaying input lines, removed duplicates, and final unique output after processing.

Input lines: Total number of lines in your original text.
Deleted lines: Number of duplicate lines removed.
Output lines: Final count of unique lines.

⚡ Why Use This Tool?

This tool is designed to be fast, private, and simple—without unnecessary features or hidden limitations.

Instant results: Processes thousands of lines in milliseconds.
100% private: Client-side JavaScript means no data uploads.
Format-friendly: Works with plain text, CSV, logs, JSON, and Excel exports.

🎯 Who Is This Tool For?

Anyone who works with text or data can benefit from removing duplicate lines quickly and safely.

Developers: Cleaning logs, environment variables, or configuration files.
Marketers: Removing duplicate email addresses, leads, or URLs.
Data Analysts: Preparing raw CSV or spreadsheet data for import.

❓ Frequently Asked Questions

Is this duplicate line remover free?

Yes. The tool is completely free to use with no registration, no subscriptions, and no daily limits.

Is my text data safe?

Yes. All text processing happens locally in your browser. Your data is never uploaded or stored on any server.

How many lines can the tool handle?

The tool can typically handle up to 100,000 lines smoothly, depending on your device’s memory and browser performance.

Can I use this tool with CSV or Excel data?

Absolutely. You can paste CSV, Excel exports, or any line-based data and remove duplicates instantly.