Remove Duplicate Lines

Remove duplicate lines from any text block.

Free · Runs in your browser · Last updated 2026-05-03

Ignore case Trim whitespace Remove empty lines

Result

About this tool

Strip duplicate lines while optionally preserving order, ignoring case or trimming whitespace.

Privacy

All processing for Dedupe Lines happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the Dedupe Lines free to use?

Yes. Dedupe Lines is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use Dedupe Lines?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does Dedupe Lines work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

Dedupe Lines works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. Dedupe Lines runs in any modern web browser with no installation, browser extension, or account required.

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