Three options cover the awkward cases: trim whitespace so " apple" and "apple" match, ignore case so "Apple" and "apple" match, and keep or discard blank lines. Because order is preserved, the output is safe to paste back into a spreadsheet or import file without re-sorting. To put the cleaned list in order, follow up with the Sort Text Alphabetically tool.
Calculator
How to use the Remove Duplicate Lines Tool
- Paste your list into the text area.
- Choose whether to trim spaces, ignore case and keep blank lines.
- Read the unique output and the count of removed lines.
- Copy the cleaned list back to your file or sheet.
About this tool
The Remove Duplicate Lines Tool is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- De-duplicating an email or keyword list before import.
- Cleaning exported log data.
- Preparing a unique tag or category list.
- Removing repeated entries from CSV column data.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Is the original order kept?
Yes. The first occurrence of each line is kept and later duplicates are dropped, so the sequence stays intact.
Will it sort my list?
No, this tool only removes duplicates. Use the Sort Text Alphabetically tool afterwards if you need ordering.
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