Remove Duplicate Lines

Remove Duplicate Lines

Remove duplicate lines from any text list instantly — case-sensitive options, trim whitespace, free.

Your data never leaves your browser — all processing happens locally on your device.

About this tool

The Remove Duplicate Lines tool cleans pasted lists, logs, emails, keywords and CSV rows by keeping only unique lines. Toggle case sensitivity, trim whitespace and skip blank lines. Perfect for SEO keyword lists, data cleanup and developer log deduplication. All processing stays on your device.

How to use the Remove Duplicate Lines

  1. 1

    Paste your text

    Paste a list with one item per line.

  2. 2

    Set options

    Choose case sensitivity, trimming and empty-line handling.

  3. 3

    Remove duplicates

    Click to dedupe and copy the cleaned list.

Frequently Asked Questions

Does it preserve line order?

Yes. The first occurrence of each unique line is kept; later duplicates are removed.

Can I ignore case?

Turn off case-sensitive mode to treat 'Hello' and 'hello' as duplicates.

Is my text uploaded?

No. Deduplication runs entirely in your browser.

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