Remove Duplicate Lines: deduplicate your lists instantly

Paste your text, choose your options, and get a clean list with only unique lines. Everything runs in your browser: your data never leaves your device.

Original text 0 lines
Unique lines 0 lines
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Unique
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Private by design. Your text is processed only in this browser using pure vanilla JavaScript. Nothing is uploaded and no external libraries are used.
About this tool

How to use the Remove Duplicate Lines tool

  1. 1
    Paste your text Paste the list or block of text you want to deduplicate into the left panel.
  2. 2
    Choose your options Enable "Ignore case" if you want to treat Apple and apple as duplicates, and "Trim whitespace" to ignore leading and trailing spaces.
  3. 3
    Copy the result The tool updates in real time. Copy the unique lines to your clipboard or download them as a .txt file.

Special features

Instant deduplication Removes duplicate lines as you type, with no page reloads or waiting.
Case-insensitive option Choose whether "Apple" and "apple" should be treated as the same line.
Trim whitespace Ignore leading and trailing spaces so lines with accidental spaces are still caught as duplicates.
Live statistics See exactly how many lines you started with, how many are unique, and how many were removed.
100% private No upload, no account, no analytics, no cookies, no external libraries. Your data stays in the browser.
Offline capable Because the tool is built entirely with vanilla JavaScript, it works completely offline after the page loads.

Frequently asked questions

Is this remove duplicate lines tool free?

Yes. The BlowFix Remove Duplicate Lines tool is completely free, with no account, no signup, and no usage limit.

How does it handle empty lines?

Empty lines are treated as valid lines. If you have multiple empty lines, all but the first one will be removed as duplicates.

What does case-insensitive mean?

If enabled, lines like Apple and apple will be treated as the same line, and only the first occurrence will be kept.

Is my text safe?

Yes. Your text is processed entirely in your browser. It is never uploaded, stored, or sent anywhere. The tool does not use cookies, analytics, or localStorage.

Does the tool work offline?

Yes. Because the tool is built entirely with vanilla JavaScript, it works completely offline after the page loads.