Supprimer les Lignes Dupliquées

What is Remove Duplicate Lines?

Remove Duplicate Lines is a free online tool that deduplicates text by keeping only the first occurrence of each line. It is ideal for cleaning up lists of URLs, email addresses, keywords, or any line-based data with unwanted repetitions.

How to use

1. Paste your text (one item per line) into the input box.
2. Click Remove Duplicates. Only unique lines are kept.
3. Copy the result to your clipboard with the Copy button.

Notes

• Comparison is case-sensitive: "Apple" and "apple" are treated as different lines.
• Empty lines are also deduplicated  Emultiple blank lines become one.
• The order of the remaining lines is preserved from the original input.

FAQ

Does it remove leading/trailing spaces before comparing?

No  Elines are compared exactly as-is, including surrounding whitespace. Trim your lines first if you want whitespace-insensitive deduplication.

Can I use this to clean a list of email addresses?

Yes. Paste one email per line and click Remove Duplicates. The result will contain only unique addresses. Note that comparison is case-sensitive, so normalize case first if needed.

Is there a line limit?

There is no enforced limit. The tool handles thousands of lines without issue on modern browsers.