Browser & Device Information

Browser

The web browser you're using to visit this site, along with its version number. Common browsers include Chrome, Firefox, Safari, Edge, and Opera.

Why it matters: Websites use this information to ensure compatibility and may serve different code to different browsers. It's also used for analytics and can contribute to browser fingerprinting.

Operating System

The operating system running on your device (Windows, macOS, Linux, iOS, Android, etc.) and often its version.

Why it matters: Helps websites optimize their display and functionality for your platform. Also used for analytics, security (some malware targets specific OS versions), and software download pages to offer the correct version.

Platform

The operating system platform string reported by navigator.platform. There are only a few possible values:

Why it matters: Platform is useful for consistency checks — if someone spoofs their User Agent to appear as macOS but navigator.platform returns Win32, the forgery is detected. This API is deprecated and being replaced by navigator.userAgentData.platform in Chromium-based browsers.

Screen Resolution

The pixel dimensions of your screen (width x height). For example, 1920 x 1080 is common for Full HD displays.

Why it matters: Websites use this to optimize layout and image sizes. Combined with other data, it contributes to your browser fingerprint. High or unusual resolutions can make you more identifiable.

Language

Your browser's preferred language setting, shown as a language code (e.g., en-US for American English, cs-CZ for Czech).

Why it matters: Websites use this to automatically display content in your language. It also reveals information about your location and background. Unusual combinations — such as cs-CZ language with a US timezone — can indicate VPN usage. Tor Browser sets the language to en-US for all users to prevent this kind of detection.

Cookies Enabled

Whether your browser accepts first-party cookies - small pieces of data that websites store on your device. This detection uses an actual cookie test, not just browser settings.

Yes Cookies are working. Your browser can store first-party cookies normally.

No Cookies are blocked. Many websites won't work correctly (login, shopping cart, preferences).

Note: Blocking only third-party cookies will still show "Yes" because first-party cookies remain enabled. To see "No", you must block all cookies in your browser settings.

Why it matters: First-party cookies are essential for website features like staying logged in, shopping carts, and saving preferences. Blocking all cookies breaks most websites, which is why 99% of users have this enabled.

JavaScript

Whether JavaScript is enabled in your browser. JavaScript is a programming language that enables interactive web content like animations, form validation, and dynamic updates.

Enabled JavaScript is working normally. Most websites require JavaScript to function properly.

Disabled JavaScript is disabled. Many websites won't work correctly, but this can improve privacy and security.

Why it matters: Modern websites heavily rely on JavaScript for essential features like login forms, shopping carts, and interactive content. However, JavaScript can also be used for tracking, fingerprinting, and potentially malicious purposes. Disabling it improves privacy but breaks most websites.

User Agent

A text string your browser sends to websites containing information about your browser, operating system, and device.

Why it matters: This is the primary source of browser and OS detection. It's a legacy from early web days and contains redundant information. It's highly useful for fingerprinting, which is why some browsers are moving to reduce or freeze user agent strings.

CPU Cores

The number of logical processor cores (navigator.hardwareConcurrency) reported by your browser. Common values are 4, 8, or 16. Very high core counts (24, 32, 64) or unusual numbers make you more identifiable.

Why it matters: This reveals details about your hardware and helps narrow down your specific device in browser fingerprinting. Some privacy-focused browsers intentionally mask or randomize this value (Brave, Tor Browser, Firefox with privacy.resistFingerprinting, LibreWolf, Mullvad Browser).

Device Memory

The approximate amount of RAM on your device in gigabytes (navigator.deviceMemory). This API is only available in Chromium-based browsers (Chrome, Edge, Opera). Firefox and Safari don't expose this value. The maximum reported value is 8 GB for privacy reasons - even if you have 16, 32, or 64 GB of RAM, the browser will report 8 GB.

Note: Privacy-focused browsers like Brave may intentionally return a modified or randomized value as part of their anti-fingerprinting protection (Brave Shields). This means the displayed value may not reflect your actual RAM. This is expected behavior, not a bug.

Why it matters: It reveals hardware details and contributes to fingerprinting. The values are approximate (0.25, 0.5, 1, 2, 4, 8 GB) to limit precision, but still add to your uniqueness profile.

Pixel Ratio

The ratio between physical pixels and CSS pixels on your display (window.devicePixelRatio). A value of 1x is standard, 2x is common on Retina/HiDPI displays.

Why it matters: Websites use this to serve higher-resolution images for HiDPI displays. Unusual values (1.25x, 1.5x, 3x) from fractional display scaling can make you more identifiable in fingerprinting.

Note: Most browsers (Firefox, Brave, Brave Tor mode, Chrome) do not mask this value, as changing it would break page rendering. The only browser that overrides it is Tor Browser, which always reports 1.0.

GPU Renderer

Your graphics card model as reported by WebGL (WEBGL_debug_renderer_info extension). This shows the exact GPU model in your device.

Note: Laptops often have hybrid graphics — both an integrated GPU (Intel/AMD) and a dedicated GPU (NVIDIA/AMD). Browsers typically use the integrated GPU by default for power efficiency. If you have a dedicated GPU but see an Intel/AMD integrated one here, this is normal behavior, not an error. You can force your browser to use the dedicated GPU in Windows Graphics Settings or your GPU control panel.

Why it matters: GPU models vary widely, making this a strong fingerprinting identifier. Combined with the vendor, it can narrow you down significantly. Privacy-focused browsers may mask or block this information.

WebGL Parameters

Technical details about your GPU's capabilities: maximum texture size, maximum renderbuffer size, and the number of supported WebGL extensions. These values are tied to your specific graphics hardware and drivers.

Why it matters: These values are hardware-dependent and difficult to change without masking. Use Firefox with privacy.resistFingerprinting or a WebGL-blocking extension. Updating your graphics drivers may change some values but won't necessarily make them more common.

Detected Fonts

The number of installed fonts detected on your system by measuring text rendering against a list of 20 common fonts. Different operating systems and software installations create different font collections.

Why it matters: Font enumeration is one of the most powerful fingerprinting techniques. Your installed fonts are highly dependent on your OS, installed applications, and personal customizations, creating a unique profile.

Note: Privacy-focused browsers like Brave intentionally report fewer detected fonts as part of their anti-fingerprinting protection. For example, you might see 18/20 in Chrome but only 15/20 in Brave on the same computer. This is expected behavior — the lower value means Brave's protection is working, not that fonts are missing from your system.

Why values differ between browsers:

• Chrome / Edge: Show the real number of installed system fonts (no protection)
• Brave: Masks some fonts to reduce fingerprint uniqueness (protection enabled)
• Brave Tor: Even more aggressive masking for maximum privacy
• Firefox (with resistFingerprinting): Restricts font enumeration to a standard set

Value stability: In Chrome and Edge, the value remains constant unless you install or remove fonts. In Brave, the value is also stable (does not change on page refresh), but may differ from Chrome due to the masking. Some privacy browsers may use "farbling" — adding slight randomization to prevent consistent tracking.

Media Codecs

The number of video and audio codecs your browser supports, tested using MediaSource.isTypeSupported(). We test 19 common codecs:

Video codecs (8):

Audio codecs (11):

Why it matters: Different browsers and operating systems support different codec sets. This contributes to your browser fingerprint and reveals information about your browser and platform capabilities.