Is the Find All Duplicates free to use?

Yes. Find All Duplicates on Markvibe is 100% free with no sign-up, no credit card, and no usage limits.

Does the Find All Duplicates upload my data to a server?

No. The Find All Duplicates runs entirely in your browser using client-side JavaScript, so your input never leaves your device. The only exceptions are tools that explicitly need a third-party API (e.g. WHOIS, DNS, AI), which is clearly indicated.

Is the Find All Duplicates safe and private?

Yes. Because processing happens locally in your browser, files, text, and other inputs are not stored on our servers. We don't require accounts and we don't track tool inputs.

Can I use Find All Duplicates on mobile?

Absolutely. Every tool on Markvibe, including Find All Duplicates, is fully responsive and works smoothly on iOS, Android, tablets, and desktops.

Do I need to install anything to use Find All Duplicates?

No installation required. Find All Duplicates is a pure web app — open the page and start using it instantly in Chrome, Firefox, Safari, Edge, or any modern browser.

What other text tools do you offer?

Markvibe ships 184+ free tools including a full suite of text tools. Scroll to "Related tools" below to discover more utilities in this category.

Find All Duplicates — Free Online Tool

What is the Find All Duplicates?

The Find All Duplicates is a free online text tools from Markvibe. Show duplicate lines only. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.

Reviewed by The Markvibe Team · Last updated 2026-06-28

Example

A worked example so you know exactly what to expect.

Input

(your input goes here)

Output

(the Find All Duplicates runs in your browser and shows the result instantly)

How to use Find All Duplicates

1Open the Find All Duplicates on this page — it loads instantly with no sign-up.
2Paste or enter your input into the field above. You can paste, type, drag-and-drop, or upload depending on the tool.
3Set any options (format, size, mode) to match exactly what you need.
4Click the run button to run Find All Duplicates in your browser.
5Review the result, then copy it to your clipboard or download the output file.