How does the tool detect my browser?

The tool reads the navigator.userAgent string to identify browser name and version, reads the screen object for resolution and color depth, reads window.devicePixelRatio for pixel ratio, uses Intl.DateTimeFormat().resolvedOptions() for timezone, and reads navigator.language and navigator.languages for language settings. All of this is done in JavaScript entirely in your browser.

What is screen resolution vs viewport size?

Screen resolution is the total number of pixels your display hardware has (e.g. 1920 x 1080). Viewport size is the area in CSS pixels available to the current browser window, which changes when you resize the window or zoom in. On high-DPI displays, the CSS pixel viewport is smaller than the physical pixel resolution, which is why pixel ratio (e.g. 2x) is listed separately.

What is the pixel ratio and why does it matter?

Pixel ratio (also called device pixel ratio or DPR) is the ratio of physical pixels to CSS pixels on your display. A DPR of 2 means each CSS pixel is rendered as 2x2 physical pixels, making text and graphics appear sharper (this is called a Retina or HiDPI display). Images served at 1x resolution will look blurry on 2x displays, which is why responsive images use srcset to serve higher-resolution assets to high-DPR screens.

What is browser fingerprinting?

Browser fingerprinting combines multiple browser attributes (screen resolution, timezone, language, installed fonts, canvas rendering, WebGL renderer, etc.) into a unique identifier that can track users across websites without cookies. This tool shows many of the attributes used in fingerprinting, but does not combine or store them. Real fingerprinting services use dozens of signals simultaneously.

What is the connection type showing?

The connection type (4G, 3G, 2G, etc.) is read from the experimental Network Information API (navigator.connection.effectiveType). It is available in Chrome and Edge but not in Firefox or Safari, so it shows as Not available in those browsers. The value reflects estimated connection quality, not the actual network type.

Is this tool the same as browser fingerprinting?

No. This tool displays your browser attributes to you, but does not store, combine, or transmit them anywhere. Browser fingerprinting services collect these attributes silently in the background and link them to a persistent tracking identifier. All processing in this tool stays local to your browser.

Is What Is My Browser free to use?

Yes. The tool runs entirely in your browser with no external API calls, no sign-up, and no data collection. It is completely free.

What Is My Browser

About What Is My Browser

What Is My Browser auto-detects your full browser environment as soon as you open the page. It shows browser name and version, operating system and version, platform, screen resolution, viewport size, pixel ratio (DPI), color depth, display orientation, system language and language list, timezone, preferred color scheme, Do Not Track status, cookie support, touch point count, and network connection type. All detection is 100% client-side using standard browser APIs: navigator, screen, window, and Intl. No data is sent to any server and the page works without any network requests. This tool is useful for developers testing responsive layouts across devices, support teams gathering environment details from users, and anyone curious about what information their browser exposes. For the UA string that identifies your browser to servers, see User Agent Parser. For your public IP address and network details, see IP Address Lookup.

Browsers expose a surprisingly large amount of information through standard web APIs without any special permissions. The combination of screen resolution, device pixel ratio, timezone, language list, browser version, and OS version creates a fingerprint that can uniquely identify many users even without cookies. The EFF (Electronic Frontier Foundation) research project Panopticlick demonstrated that the vast majority of browsers are unique across these parameters, with browser fingerprints being stable enough to track users across sessions. In response, browser vendors have been progressively reducing the fingerprinting surface. Firefox randomizes the canvas fingerprint when privacy.resistFingerprinting is enabled. Safari limits access to certain APIs and reduces screen resolution precision in certain contexts. Chrome's Privacy Sandbox project aims to replace third-party cookies with aggregated interest-group advertising APIs that reduce cross-site tracking. The Do Not Track (DNT) header, shown as a preference in this tool, is a browser setting that sends a request header asking websites not to track the user. However, DNT is a voluntary signal with no legal enforcement in most jurisdictions, and most advertising networks do not honor it. The Global Privacy Control (GPC) signal is a more recent initiative with legal weight in California under the CPRA, which requires covered businesses to honor it. Timezone and language detection are legitimately useful for web applications: timezone is used to show correct local times, and language is used for automatic locale selection and serving translated content. The viewport and screen resolution are critical for responsive design testing.

How to use What Is My Browser

Open the tool: your browser details are auto-detected instantly on page load.
Review browser, OS, screen, language, timezone, and capability info in grouped cards.
Click "Copy All Info" to copy everything to the clipboard as plain text.

Frequently Asked Questions

How does the tool detect my browser?: The tool reads the navigator.userAgent string to identify browser name and version, reads the screen object for resolution and color depth, reads window.devicePixelRatio for pixel ratio, uses Intl.DateTimeFormat().resolvedOptions() for timezone, and reads navigator.language and navigator.languages for language settings. All of this is done in JavaScript entirely in your browser.
What is screen resolution vs viewport size?: Screen resolution is the total number of pixels your display hardware has (e.g. 1920 x 1080). Viewport size is the area in CSS pixels available to the current browser window, which changes when you resize the window or zoom in. On high-DPI displays, the CSS pixel viewport is smaller than the physical pixel resolution, which is why pixel ratio (e.g. 2x) is listed separately.
What is the pixel ratio and why does it matter?: Pixel ratio (also called device pixel ratio or DPR) is the ratio of physical pixels to CSS pixels on your display. A DPR of 2 means each CSS pixel is rendered as 2x2 physical pixels, making text and graphics appear sharper (this is called a Retina or HiDPI display). Images served at 1x resolution will look blurry on 2x displays, which is why responsive images use srcset to serve higher-resolution assets to high-DPR screens.
What is browser fingerprinting?: Browser fingerprinting combines multiple browser attributes (screen resolution, timezone, language, installed fonts, canvas rendering, WebGL renderer, etc.) into a unique identifier that can track users across websites without cookies. This tool shows many of the attributes used in fingerprinting, but does not combine or store them. Real fingerprinting services use dozens of signals simultaneously.
What is the connection type showing?: The connection type (4G, 3G, 2G, etc.) is read from the experimental Network Information API (navigator.connection.effectiveType). It is available in Chrome and Edge but not in Firefox or Safari, so it shows as Not available in those browsers. The value reflects estimated connection quality, not the actual network type.
Is this tool the same as browser fingerprinting?: No. This tool displays your browser attributes to you, but does not store, combine, or transmit them anywhere. Browser fingerprinting services collect these attributes silently in the background and link them to a persistent tracking identifier. All processing in this tool stays local to your browser.
Is What Is My Browser free to use?: Yes. The tool runs entirely in your browser with no external API calls, no sign-up, and no data collection. It is completely free.

What Is My Browser

About What Is My Browser

How to use What Is My Browser

Frequently Asked Questions

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