Duplicate Line Remover
Remove repeated entries from a list while keeping the first copy of each entry. Put one entry on each line and choose whether letter case matters.
How to use Duplicate Line Remover
1. Paste or type your text or list into the box. 2. Choose any options shown, then select Remove. 3. Select Copy result to copy the answer. 4. Select Reset to clear the box and start again.
Why use this tool?
Clean a pasted list before using it in a spreadsheet, a document or another list tool. Keeping the first occurrence preserves the order of the entries you originally collected.
How the calculation works
Keep the first row for each normalised line key. Entries are non-empty trimmed lines. Blank lines are ignored; repeated entries remain separate row slots unless the tool explicitly removes duplicates. Commas inside a line are retained. Case-sensitive selection compares exact case; off compares lowercase keys. Whitespace at line edges is trimmed before comparison.
Example
Worked example: Lines = "A\na\nB"; Case Sensitive = false. Result: A B.
Practical tip
Save a copy of the original list before removing duplicates, especially if repeated rows may be intentional.
Frequently asked questions
Which copy of a repeated entry is kept?
The first copy is kept. Later matching entries are removed, and the remaining entries stay in their original order.
Are “Apple” and “apple” treated as duplicates?
They match when case-sensitive comparison is off. Turn it on if capitals distinguish entries in your list. Spaces at the start and end of each line are trimmed.
How do I copy the result or start again?
Select Copy result after running the tool to copy the displayed answer. Reset clears the text and result, so keep a separate copy of any text you want to save.