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User Agent Generator

Build realistic browser user agent strings from a browser, version, engine, operating system and device.

Build a user agent

Length: 0 characters
Selected: none
User agent sniffing is unreliable: browsers freeze, spoof and trim these strings, so feature detection is the safer choice.

How to use the User Agent Generator

  1. Choose a browser, then set the version, engine, operating system and device.
  2. Click Generate to assemble a realistic user agent string for that combination.
  3. Copy the string and paste it into your request headers or testing tool.

Features

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Frequently Asked Questions

Common questions about the free online user agent generator.

It is a short header that a browser sends with every request to identify itself, its engine and its platform.
Pick a browser, version, engine, operating system and device, then click Generate and copy the finished string.
Chrome, Firefox, Safari, Edge and Opera, each with a built-in table of recent stable versions updated regularly.
Yes. Every option can be mixed, so you can build mobile, tablet and desktop strings for each browser.
They follow the real token order of each browser. Real traffic can still differ because vendors trim or freeze these strings.
Browsers freeze, trim and spoof these strings, so feature detection and progressive enhancement are far safer choices.
No. Every string is assembled locally in your browser and nothing you choose is uploaded or logged.
Yes. They are handy for testing how your site responds to different browsers, engines and device classes.
No. It only builds strings from the options you choose and never reads or reports your own browser identity.
Yes. It is free and unlimited, needs no account, and works on any modern desktop or mobile browser.

Last updated: October 10, 2026