Is the duplicate line removal case-sensitive?

By default, the tool is case-sensitive, meaning 'Apple' and 'apple' are treated as different lines. You can toggle the case-insensitive option to treat them as duplicates and remove both down to one unique entry.

Can I sort the output lines after removing duplicates?

Yes! The tool includes a Sort Lines option. You can sort the deduplicated output alphabetically in ascending (A–Z) or descending (Z–A) order before copying the result.

Duplicate Line Remover

Remove duplicate lines from any list or text block instantly — free, fast, and 100% in your browser.

🧹 Remove Duplicate Lines

Case-insensitive Ignore blank lines Trim whitespace

Sort:

Input Text

Output (Deduplicated)

📖 How to Use

Paste your text or list into the Input Text box on the left. Each line will be treated as a separate entry.
Choose your options: toggle Case-insensitive if you want "Apple" and "apple" counted as duplicates; enable Ignore blank lines to strip empty lines; enable Trim whitespace to normalize spacing.
Select a Sort option if you want the output lines ordered alphabetically (A–Z or Z–A).
Click Remove Duplicates. The deduplicated result appears instantly in the right box along with stats.
Click Copy Result to copy the output to your clipboard, or Use Output as Input to run another pass.

ℹ️ About This Tool

The Duplicate Line Remover is a free online tool that helps you instantly remove duplicate lines from any block of text. Whether you're cleaning up an email list, deduplicating a CSV column, tidying code output, or consolidating tags and keywords, this tool handles it in milliseconds — no software to install, no account required.

Simply paste your text, configure a few options, and click a button. The tool supports case-insensitive deduplication, so you can treat "HELLO" and "hello" as the same line. You can also trim whitespace to catch lines that differ only by leading or trailing spaces, and ignore blank lines to produce clean, gap-free output. A built-in sort feature lets you alphabetically order your deduplicated results on the fly.

All processing happens entirely in your browser — your data never leaves your device, making this tool completely private and safe for sensitive information. Use it to deduplicate text and remove duplicates online in seconds.

❓ Frequently Asked Questions

The Duplicate Line Remover scans your pasted text and removes any lines that appear more than once, keeping only the first occurrence of each unique line. It works on any type of list, CSV data, email lists, code snippets, or plain text blocks.

By default the tool is case-sensitive, meaning "Apple" and "apple" are treated as different lines. Toggle the Case-insensitive checkbox to treat them as duplicates so only one entry is kept in the output.

Yes! Use the Sort dropdown to order the deduplicated output alphabetically. Choose A → Z for ascending or Z → A for descending order. Select No sort to preserve the original order of first appearances.

You control this with the Ignore blank lines toggle. When enabled (default), blank lines are stripped from the output entirely. When disabled, blank lines are treated like any other line — so multiple blank lines collapse into one.

Completely safe. All processing happens entirely in your browser using JavaScript. No data is ever sent to or stored on any server. You can even use this tool offline once the page has loaded in your browser.