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Free user agent checker

What Is My User Agent?

Your user agent tells every website which browser and operating system you use. See it, decode it and learn what else your browser volunteers.

Your user agent

Read from the request your browser just sent, then decoded.

What we test, what we do not, and what we store

Full method →

We test

  • Your user agent string and what can be parsed from it
  • Client Hints and other properties JavaScript can read about your browser

We do not test

  • Whether your user agent is spoofed or modified by an extension
  • What individual websites do with these details

What we store

  • Nothing: the details are shown in your browser and not uploaded
  • Anonymous usage counts only: which tool was completed and a coarse result category, never what you typed, your IP address or your results. Nothing is sent if your browser signals Global Privacy Control or Do Not Track.

Third parties that see data: None. This test makes no third-party requests.

What is a user agent?

The user agent is a line of text your browser sends with every request, identifying the browser, its version and the operating system. A typical one looks like Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36. Websites use it to send the right layout, to decide which features to enable and, often, to count visitors.

Why it looks so strange

Almost every user agent starts with "Mozilla/5.0" and mentions several other browsers. That is history: early sites served better pages to Netscape (code-named Mozilla), so every later browser pretended to be it, then pretended to be Safari and Gecko too, to avoid being served worse content. The result is a string where "Chrome" and "Safari" both appear in a Chrome user agent, so correct detection needs careful ordering. Our parser checks Edge, Opera and Samsung Internet before Chrome for exactly this reason.

User-agent reduction and Client Hints

The user agent carries enough detail to help identify you, so browser makers are shrinking it. Chrome and Edge now freeze most of the version and device details inside it and offer a replacement: User-Agent Client Hints. Basic hints (brand, mobile, platform) are sent by default. Detailed ones (exact version, CPU architecture, device model) are only sent when a site asks for them, which makes it easier to see which sites want them. Firefox and Safari do not support Client Hints and send a simple user agent only.

Is it a privacy risk?

On its own, a user agent is shared by millions of people, so it is a weak identifier. It matters in combination with other details: add your screen size, time zone, fonts and graphics card and you may be unique. See how unique your browser is.

The user agent can also be spoofed. Extensions and developer tools can change it, but remember that a spoofed value that disagrees with the rest of your browser (a Safari user agent from a Windows font set, for example) can make you stand out more, not less.

Common uses of this tool

  • Reporting a bug and including your browser version.
  • Checking whether a site gets the mobile or desktop version.
  • Testing user agent switchers and privacy extensions.
  • Developers verifying what a request really contains.

Last reviewed 2026-10-26. Found a mistake? Report a correction (how we handle them).

Fix it and learn more

What Is Browser Fingerprinting?Browser fingerprinting identifies you without cookies by combining screen size, fonts and graphics. How it works, who uses it and how to reduce it.How Websites Track You Without CookiesCookies are only one way sites follow you. IP addresses, fingerprints, tracking IDs and logins work too. What they are and how to limit them.

Also check your…

HTTP Headers ViewerThe exact request headers every website receives from you.Browser Fingerprint TestHow unique is your browser? Computed on your device, never uploaded.Am I Using a VPN?Check whether sites see you as a VPN, proxy or data-centre connection.Full Privacy ScanRun every check at once and get a 0–100 privacy score with fixes.

Frequently asked questions

How do I change my user agent?

Browser developer tools (network conditions panel in Chrome and Edge) can override it temporarily, and extensions can do it permanently. Spoofing it can break websites and can make you more identifiable.

Why does my Chrome user agent say Safari and Mozilla?

For historical compatibility. Browsers inherited those words so older websites would serve them modern content.

What is the difference between the user agent and Client Hints?

The user agent is one string sent to every site. Client Hints are separate headers and a JavaScript API, so sites can ask for just the detail they need and the browser can decide what to share.

Can websites see my real device from the user agent?

They see the operating system and device class (desktop, phone, tablet) and, on some Android phones, the model. Newer browsers hide the model unless a site asks for it.