Are these real, valid user-agent strings?

Yes. Each string follows the documented format for its browser and platform, using realistic version numbers and the correct token order, so it parses correctly in user-agent libraries and matches what real browsers send.

Why would I need to generate user agents?

Common uses are testing user-agent detection branches, validating analytics or log parsers, seeding mock data, and checking that responsive or feature-gating logic behaves correctly for different browser and device combinations.

Do mobile strings include the right tokens?

Yes. Mobile Chrome and Safari strings include the platform tokens such as Android version and device class, or iPhone OS version, plus the Mobile or Mobile Safari markers that detection code relies on.

Should I use these to disguise my browser?

These are intended for legitimate testing and mock data. Spoofing your user agent to bypass access controls or terms of service is a different use case, and many sites detect inconsistencies between the UA string and other signals.

Does this contact any server?

No. Strings are assembled locally in JavaScript from version tables and templates, so nothing is sent anywhere and it works offline.

Random User Agent Generator

A user-agent string is the identification header a browser sends with every request, describing its engine, version, and platform. This generator produces valid, realistic strings for the major browsers across desktop and mobile so you can exercise UA-detection logic and parsing without manually copying real ones.

How it works

Each browser has a well-defined user-agent template. The tool fills these templates with plausible version numbers and the correct platform tokens:

Chrome/desktop: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
                (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Safari/iPhone:  Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X)
                AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.1
Firefox/Linux:  Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.0

When you constrain the browser or platform, the generator only draws templates that match; on Any it picks randomly across the whole valid matrix. Every string keeps the historical Mozilla/5.0 prefix and the engine tokens that real browsers still send for compatibility.

Tips and notes

Use these to cover the branches in your detection code rather than relying on a single hard -coded UA. Pair desktop and mobile variants to confirm responsive logic, and feed a batch into your analytics parser to verify it classifies them correctly. Remember that modern detection should prefer feature checks and Client Hints over UA parsing where possible — the UA string remains useful but is increasingly frozen and reduced by browser vendors.