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Remove Duplicate Lines

Strip duplicate lines from a list while preserving the original order. Optionally ignore case and trim leading/trailing whitespace before comparing.

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How it works

We walk the lines top-to-bottom and keep the first time each line appears. The second occurrence onwards is dropped. The summary shows how many were removed.

How to use it

  1. Paste the list

    Drop in any list with duplicates: emails, keywords, log lines, IDs, anything separated by line breaks.

  2. Toggle case and trim

    Case-insensitive treats Apple and apple as the same. Trim ignores leading/trailing whitespace before comparing.

  3. Run the dedupe

    We walk lines top to bottom, keep the first occurrence of each, drop the rest. Original order is preserved.

  4. Copy the unique lines

    The summary tells you how many were removed. Copy the clean list straight into your CRM, your Ads import, or your DB.

Use cases

Clean up an exported list of email addresses.

Dedupe a keyword list before importing into Ads.

Find unique log entries in a paste.

Build a unique vocabulary from a long text.

Your data never leaves your browser

Every utility runs entirely on your device. Nothing is uploaded, nothing is stored on a server. You can disconnect from the internet and they keep working.

Frequently asked questions

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Strip blank lines from a list or paragraph.

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Sort alphabetically or numerically, asc or desc.

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Remove Lines Containing…

Filter out (or keep) every line that matches a string or regex.