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Remove Duplicate Lines

Remove duplicate lines from text. Options for case-insensitive matching and blank line handling.

Remove Duplicate LinesGratisText UtilitiesRuns in your browser

Works in your browser. What you paste or upload is processed on your device.

Key features of the duplicate line remover

  • Removes all duplicate lines in one click
  • Case-sensitive and case-insensitive deduplication modes
  • Shows count of duplicates removed
  • Option to sort remaining unique lines
  • Works with any line-separated text

How to use the duplicate line remover

  1. Paste your text

    Enter the text with duplicate lines into the input area.

  2. Choose options

    Select case-sensitive or case-insensitive matching.

  3. Remove duplicates

    Click 'Remove Duplicates' to clean the text.

  4. Review the output

    See the deduplicated text and the count of removed lines.

  5. Copy clean text

    Click 'Copy' to copy the unique lines to your clipboard.

What is a duplicate line remover?

The Remove Duplicate Lines tool scans your text and removes all repeated lines, leaving only unique entries. It's essential for cleaning lists, deduplicating keyword lists, removing repeated log entries, and processing any line-based data where duplicates cause problems.

Duplicate lines waste space and distort analysis results. Whether you're processing a keyword list from multiple sources, cleaning exported data, or tidying up logs, this tool instantly removes all duplicates with options for case-sensitive or case-insensitive matching.

Why use a duplicate line remover?

Manually scanning text for duplicate lines is impractical for anything over a few dozen entries. This tool processes thousands of lines in seconds, ensuring your lists and data are clean, unique, and ready for use without tedious manual deduplication.

Duplicate line remover: frequently asked questions

Something else? Ask the team

What counts as a duplicate line?

A duplicate line is any line of text that appears more than once in the input. The tool keeps the first occurrence and removes all subsequent repetitions.

What is case-insensitive deduplication?

Case-insensitive mode treats 'Hello' and 'hello' as duplicates. Case-sensitive mode treats them as different lines. Use case-insensitive for keyword lists where capitalisation variations are duplicates.

Can I use this for keyword list deduplication?

Yes — this is one of the most common use cases. Export keyword lists from multiple tools, combine them, paste into this tool, and remove duplicates to get a clean unique keyword set.

Does it preserve the original order?

Yes. The tool preserves the order of first occurrence by default. Unique lines appear in the order they first appeared in the original text.

Is there a line limit?

The tool handles thousands of lines efficiently. Very large datasets (100,000+ lines) may be slow to process in a browser — for very large datasets, command-line tools or scripts may be more appropriate.

Each one opens on its own page and works straight away, with no sign-up.

Ontdek meer gratis tools:Schema GeneratorMetatag GeneratorLLMs.txt GeneratorBrowse all free tools

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fieldnote.app4,571 credits

Site audit

fieldnote.app · SEO, AEO and GEO

Illustrative data
SEO
82
+6
AEO
64
+11
GEO
58
+9
Pages
48
Fixesby impact
  • /pricing · Missing H1High
  • /blog/guide · No FAQ schemaMedium
  • /llms.txt · Not foundMedium
  • /about · Meta description too longLow

See where your whole site stands

Paste your site. The free audit scores it for SEO, answer engines and generative engines, with the fixes.

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