A free, no-sign-up browser checker is a tool that reads the identity fields your current browser exposes and displays them on the page, with nothing to install, no account to create, and nothing uploaded to a server. The What Browser Am I Using tool works exactly that way: it inspects browser-reported fields after the page loads, shows you what your browser chooses to disclose, and lets you copy the result as plain text. Because all reading happens locally, the report cannot be used to authenticate you, fingerprint you into a server record, or prove which installed application produced the page. It is meant for troubleshooting, support tickets, and quick sanity checks — not for proving identity or security state. This matters because the user-agent string most websites send contains historical compatibility tokens and several brand names stitched together, which makes naive string-matching tools overconfident about what is actually running. Below is exactly what the tool shows, how to use it for free without signing up, and how to read each field with the right expectations.
What the tool actually shows you
When you open the tool in any modern desktop or mobile browser, it reads a small set of fields that the browser itself chooses to expose through standard web APIs. The result is a transparent report, not a verdict. The visible sections are:
- Reported brands and major versions — drawn from navigator.userAgentData.brands when the browser implements User-Agent Client Hints. The tool filters the intentionally meaningless "Not A Brand" / GREASE-style placeholder that browsers use to prevent code from assuming a fixed brand list, then keeps the remaining brand and version pairs in the order the browser provided them.
- Platform — taken from the Client Hint platform when available, otherwise from navigator.platform. Both values can be reduced, legacy-formatted, frozen, or chosen for compatibility reasons.
- Mobile hint — a boolean supplied by the Client Hint interface only when the browser provides it. It is not a screen-size guess, device model, touch test, or proof the browser runs on a phone.
- Language — from navigator.language. It may differ from your content preferences, physical location, keyboard layout, or account settings.
- Cookies enabled — mirrors navigator.cookieEnabled. It reflects the browser's general reported setting, not whether every cookie write will succeed.
- Raw user-agent string — the full navigator.userAgent value, preserved verbatim because support teams and bug reports often request it. Treat it as an opaque compatibility string, not authenticated identity.
If you want a quick safety overview of what kind of data a browser-checker page can read and what stays local, the safety walkthrough for online browser checks breaks down the same questions from a privacy angle.
Check your browser free without signing up
- Open What Browser Am I Using in the browser you want to identify — no account, extension, or download is required.
- Read the reported brand list at the top of the page. If it shows real product names and major versions, those came from User-Agent Client Hints in the order your browser provided them. If it says Browser name not exposed, your browser does not surface meaningful Client Hint brands and the tool is being honest about that gap rather than guessing.
- Compare platform, mobile hint, language, and cookie setting against what you expect. Each one is read directly from a standard web API and reflects only what your browser chooses to report; extensions, privacy tools, and developer overrides can change any of them.
- Scroll to the raw user-agent string. Treat it as an opaque compatibility string: it can include historical tokens and several brand names without meaning that many products are running, and it can be reduced or spoofed.
- Select Copy browser report to export the same visible values as plain text. Clipboard access happens only after you click, so nothing is silently copied.
- Paste the report into a support ticket or chat, then add the failing URL, the time, reproduction steps, screenshots, your extension state, and whether private mode changes the behavior — those details turn a raw report into a usable bug report.
Reading the reported fields with the right expectations
Each field on the page answers a narrow question, and over-reading it is the most common mistake. The table below pairs what the field looks like with where it comes from and what it cannot prove.
| Field on the page | Where it comes from | What it cannot prove |
|---|---|---|
| Reported brands and major versions | navigator.userAgentData.brands, with the "Not A Brand" GREASE-style placeholder removed | That those brands support a particular feature, are the only engine active, or reflect the current security state |
| Platform | Client Hint platform, falling back to navigator.platform | The exact device model, OS build, security patch level, or update channel |
| Mobile hint | Client Hint mobile boolean, only when the interface supplies one | Screen size, touch capability, device class, or that the browser runs on a phone |
| Language | navigator.language | Your content preferences, physical location, keyboard layout, or account settings |
| Cookies enabled | navigator.cookieEnabled | That any specific cookie write will succeed, or that tracking is allowed |
| Raw user-agent string | navigator.userAgent, preserved verbatim | The installed application, executable signature, update channel, security patch level, device owner, or whether the string has been modified |
When the page says Browser name not exposed
Some browsers do not implement navigator.userAgentData, and some implementations return only placeholder brands that the page deliberately filters. In either case the tool refuses to fall back to a fragile string-parsing guess. Mapping a legacy user-agent string to a confident product and exact version requires a maintained parser, and even then reduction, spoofing, embedding, and privacy tools can defeat it. Saying Browser name not exposed is the honest answer; treating it as a failure of the tool is the wrong read. The widget preserves only the browser-supplied values and removes the placeholder, rather than maintaining a large user-agent pattern table that would inevitably go stale. If an exact supported-browser decision matters for a feature, prefer feature detection on the Web API you need and consult the browser's own About or update screen — a reported brand alone does not demonstrate support for a particular feature or security state.
What Cookies enabled actually proves
The Cookies enabled line mirrors navigator.cookieEnabled. It is a one-line summary of the browser's general reported setting, not a guarantee that any particular cookie write will succeed on any particular site. Third-party cookie restrictions, partitioning, private mode, expiration, domain and path rules, consent choices, extensions, enterprise controls, and storage access policy can still block a specific cookie. The tool does not create a test cookie, does not infer tracking availability, and does not report anything about fingerprinting, local storage, IndexedDB, or cache partitioning. If a website tells you "your browser blocks cookies," the report can confirm the browser's general setting but it cannot diagnose that site's specific failure — that requires testing the site itself with the same extensions and account state you usually use.
Send the report to a support team
Support teams and bug reports usually want the same handful of details, and the tool is built to hand them over without extra steps. Click Copy browser report to put the visible fields on your clipboard as plain text, then attach it to a ticket along with reproduction steps. The report cannot prove the installed application, executable signature, update channel, security patch level, or device owner, and automation, webviews, privacy tools, proxies, extensions, developer overrides, and remote browser services can change the string — so the copy is a starting point, not a verdict. For an issue that only reproduces in a specific build, add the failing URL, the local time of the attempt, a short step list, screenshots, your extension state, and a note about whether private mode changes the behavior. Those extras turn a raw field dump into a reproduction package a maintainer can act on, and they let the team distinguish a real compatibility issue from a single-site configuration quirk.
Because all fields are read locally after the page loads, nothing is uploaded, fingerprinted into a server record, or persisted by the widget itself. Clipboard access happens only when you select Copy browser report. The reliable contract is narrow: show browser-supplied fields transparently, remove only the known meaningless brand placeholder, preserve raw values, and use an honest fallback when a product name is not exposed.
For a deeper look, see What Browser Am I Using Meaning: Field-by-Field Guide.