Free Remove Duplicate Lines Tool

Deduplicate any list with control — case-sensitive matching and optional A→Z / Z→A sorting on top of order-preserving dedupe.

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Runs entirely in your browser — paste text and watch the results update instantly. Nothing is uploaded.

100% Client-Side — Your text stays in your browser. Nothing is uploaded.

How to use this tool

  1. 1

    Paste your list

    Keywords, emails, URLs, inventory codes — one item per line, any length.

  2. 2

    Tune the matching

    Toggle Case-sensitive matching if 'Apple' and 'apple' must stay distinct, and choose Keep original order, A→Z or Z→A.

  3. 3

    Copy the unique set

    First occurrences always win; copy the result back or download it as a .txt.

Key features

SettingBehavior
Case-sensitive OFF (default)'Apple' = 'apple' — one survives
Case-sensitive ON'Apple' and 'apple' both kept
Keep original orderFirst occurrences, original sequence
Sort A→Z / Z→AUnique lines sorted after dedupe

Privacy: your text never leaves your browser

Every Toolflect Text Tool is 100% client-side. The moment you type or paste text, it is analyzed by JavaScript running inside this browser tab. Your text is never sent to our servers, never stored in a database, and never shared with any third party or AI service.

  • No uploads, no accounts, no sign-up
  • No cookies or tracking of your text
  • Works offline once the page has loaded
  • Close the tab and your text is gone from memory

You can even verify it yourself: open your browser's developer tools, switch to the Network tab, and type into the tool — the only requests you will ever see are this page's own static files (HTML, CSS, JavaScript). Nothing you type is ever transmitted.

Frequently asked questions

Is matching case-sensitive?
Your choice — the Case-sensitive checkbox is off by default so 'Apple' and 'apple' merge; tick it to treat them as distinct lines.
Can the result be sorted?
Yes — pick Keep original order (first occurrences in place), Sort A→Z or Sort Z→A from the Result order dropdown.
Why weren't space-padded lines merged?
Leading/trailing whitespace makes lines distinct. Run Trim Lines first if padding doesn't matter.
Is there a size limit?
No practical one — dedupe runs locally at memory speed, entirely in your browser.

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