Remove Duplicate Lines

What Is Remove Duplicate Lines?

Remove Duplicate Lines takes a list with repeated lines and keeps only the first occurrence of each line. Use it to clean up pasted lists, email addresses, URLs, keywords, or any line-based list where repeats crept in. The order of the lines you first wrote is preserved; nothing is sorted.

How to Use Remove Duplicate Lines

1. Open the Remove Duplicate Lines page in your browser.
2. Paste or type your list into the workspace textarea, one item per line.
3. Click Process.
4. Read the result in the result panel. Use Copy to copy it, or Download to save it.
5. Click Clear to empty the workspace and clean another list.

Worked Example

I pasted six lines into the workspace:

apple
banana
apple
Apple
banana
cherry

The tool returned:

apple banana Apple cherry --- 2 duplicate lines removed ---

Four unique lines remain, in their first-occurrence order: apple, banana, Apple, and cherry. The second apple and the second banana were removed, which is why the count says 2 duplicate lines removed.

Limitations

• Case-sensitive matching. Apple was kept as a separate line from apple, because the two are not an exact match. If you need case-insensitive dedup, normalise the case first.
• Exact-match only. Lines that differ by a space or punctuation are treated as different lines, so trailing spaces can leave apparent duplicates behind.
• Output is space-joined, not line-separated. The result shows the unique lines separated by spaces on one line, rather than one per line, so it does not paste back as a clean list without further editing.
• The count is part of the result text. The footer “— 2 duplicate lines removed —” appears inside the result, so it will be included if you copy the whole result. Delete that footer before pasting the list elsewhere.

Frequently Asked Questions

Does it sort my list?

No. The surviving lines stay in the order they first appeared. In the example, cherry stays last because that is where it first appeared.

Are Apple and apple treated as duplicates?

No. Matching is case-sensitive, so Apple and apple are kept as two different lines.

How do I know how many lines were removed?

The result ends with a count, such as “— 2 duplicate lines removed —“. In the example, six input lines minus four unique lines equals two removed.

Do I need an account to use it?

No. The tool runs in the browser tab and does not ask for an account or sign-up.