How do I remove duplicate lines?

Paste your text into the input area. Duplicate lines are removed instantly and the unique lines are shown in the output, preserving the original order.

Is the comparison case-sensitive?

By default yes — "Apple" and "apple" are treated as different lines. Toggle the case-insensitive option to treat them as duplicates.

Can I sort the output?

Yes — enable the "Sort output" option to sort the unique lines alphabetically after removing duplicates.

Does it trim whitespace?

Enable the "Trim whitespace" option to strip leading and trailing spaces from each line before comparison. This catches lines that differ only in surrounding whitespace.

How many lines can I process?

There is no hard limit — the tool processes any amount of text directly in your browser. Very large inputs (millions of lines) may be slow depending on your device.

Remove Duplicate Lines

Remove duplicate lines from text instantly. Keeps unique lines in their original order. Options for case-sensitivity, trimming, and sorting.

Your files never leave your device

Case-sensitiveTrim whitespaceSort output

Input

How to Remove Duplicate Lines

Paste your text into the input area.
Choose options: case-sensitive matching, trim whitespace, sort output.
The deduplicated output appears instantly below.
Click Copy to copy the result, or clear the input to start fresh.

Why Use This Tool?

Lists of keywords, email addresses, domains, or code lines frequently contain duplicates. This tool removes them in one click, preserving original order or sorting the results, running entirely in your browser with no data sent anywhere.

Remove Duplicate Lines

How to Remove Duplicate Lines

Why Use This Tool?

Frequently Asked Questions