Use the Remove Duplicate Lines in three steps
Paste the list
Put one item on each line in the input box.
Choose matching rules
Decide whether capitalization matters and whether blank lines should be removed.
Copy the clean result
Use or download the deduplicated list.
Case-sensitive versus case-insensitive
With case sensitivity off, Apple and apple are treated as the same line. Turn it on when capitalization identifies different codes or values.
First occurrence wins
When a line repeats, the tool keeps its earliest occurrence. It does not sort the result or otherwise change item order.
Remove Duplicate Lines FAQ
Will the tool sort my lines?＋
No. It keeps the original order and removes only later duplicates.
Are leading spaces significant?＋
Yes. Lines are compared as entered, so leading or trailing spaces can make values different.
Can blank lines be kept?＋
Yes. Turn off Remove blank lines to retain the first blank line.
What does case sensitive mean?＋
When enabled, ITEM and item are treated as two different lines.
Can I use this for email addresses?＋
Yes. Case-insensitive matching is usually the practical choice for cleaning email lists.
Is there a fixed line limit?＋
The tool sets no artificial limit, though extremely large text can depend on available browser memory.