Online Duplicate Line Remover

0Lines removed

Email lists, keyword lists, code snippets or anything exported from a spreadsheet tend to end up with repeated lines. Checking that by hand is slow and error-prone. This tool compares every line in your text and removes the repeats automatically.

Paste your list, adjust the options below if you want to ignore case or trim extra spaces, then click remove duplicates.

When to use it

  • Cleaning email lists before an outreach campaign.
  • Deduplicating keyword lists for SEO.
  • Removing repeated rows copied from spreadsheets or databases.
  • Prepping simple CSV files before importing them elsewhere.

Practical example

You exported contacts from two different spreadsheets and now have an email list with dozens of repeats — some written as "Mary@company.com" and others as "mary@company.com." Paste the list, tick "ignore case," and click remove duplicates: the counter shows exactly how many lines were removed.

Frequently asked questions

Is the line order preserved?

Yes, the tool keeps the first occurrence of each line in its original order.

Can I ignore case differences?

Yes, tick 'ignore case' to treat 'Text' and 'text' as the same line.

What about extra spaces at the start or end of a line?

Enable the trim option so lines are compared without leading or trailing spaces.

Does it remove similar lines, or only identical ones?

Only identical ones (or identical ignoring case, if that option is checked). Lines with small typing differences, like an extra space in the middle, aren't detected as duplicates.

Does it work with very large lists?

Yes, there's no hard technical limit, but lists with tens of thousands of lines may take a bit longer to process since everything runs in the browser.

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