Remove Duplicate Lines
Remove duplicate lines from lists, ideal for emails, inventories, and CSV data, to speed up cleanup and keep records clean. GDPR-compliant.
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How to use this tool (video)
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Remove duplicate lines
This tool removes duplicate lines from a list and keeps each line only once. That lets you quickly clean up email lists, product inventories or CSV extracts.
Options when removing
- Trailing and leading whitespace can be trimmed.
- Case can be respected or ignored.
- The number of removed duplicates is shown.
This is especially handy when you merge data from several sources and want to make sure every entry appears only once. Processing happens locally in your browser.
Frequently asked questions
How does the tool remove duplicate lines?
The tool compares all lines in your list and keeps each entry only once. Duplicate occurrences are removed while the remaining lines keep their order.
Is case respected?
That is configurable. Case can be respected or ignored. When ignored, entries such as "Hallo" and "hallo" are treated as equal.
What happens to leading and trailing spaces?
Optionally, spaces at the beginning and end of lines can be trimmed. This helps the tool also spot duplicates that differ only by extra whitespace.
Can I see how many duplicates were removed?
Yes. The tool shows the number of removed duplicates so you can understand what was cleaned up.
What is removing duplicate lines useful for?
It helps clean up email lists, product lists, inventories or CSV extracts when you merge data from several sources and want to make sure every entry appears only once.
Is my text sent to a server?
No. Processing happens locally in your browser, and your data is not transmitted or stored.