Browser Information Checker
One page that shows what your browser tells websites: browser and version, operating system, screen, window and pixel ratio, colour scheme, languages and time zone, hardware and connection hints, privacy settings such as cookies and Global Privacy Control, and which modern features and media formats work. Copy or download the report to attach it to a bug report or support ticket.
- Runs in your browser
- No sign-up
- Free to use
Everything below is read by your browser on this page. Nothing is sent to our server or stored. Your IP address is shown by What Is My IP.
How to use Browser Information Checker
- Open the page; the details appear immediately.
- Resize the window or rotate the device to see the viewport update.
- Copy or download the report.
- Paste it into your support ticket or bug report.
Browser Information Checker features
Browser and system
Parsed from the user agent, plus exact client hints where the browser offers them.
Display
Screen, viewport, pixel ratio, colour depth, dark mode, HDR and pointer type.
Region
Languages, time zone, UTC offset and date and number formats.
Privacy settings
Cookies, Do Not Track, Global Privacy Control and storage.
Feature support
WebAssembly, WebGPU, passkeys, WebRTC, video codecs and AVIF/WebP images.
Stays on your device
Read locally; nothing is sent or stored.
When to use Browser Information Checker
- Giving a support team the exact browser and screen details they ask for.
- Checking why a site looks different on a high-density or small screen.
- Confirming that dark mode, reduced motion or GPC preferences reach websites.
- Testing whether a browser supports AVIF images, AV1 video or passkeys.
Browser Information Checker FAQ
Is my information sent anywhere?
No. The page reads the values with JavaScript in your browser and displays them. Nothing is transmitted to our server or stored.
Why do screen and window size differ?
The screen size is the whole display; the viewport is the part of the browser window that shows the page. Websites lay themselves out by the viewport.
What is the device pixel ratio?
How many physical pixels make up one CSS pixel. A ratio of 2 or 3 is typical for phones and high-resolution laptop screens.
What are client hints?
A newer, more structured way for Chromium-based browsers to reveal details such as the exact platform version and device model, which reduced user-agent strings no longer include.
Why is memory shown as a round number?
Browsers report deliberately coarse values, such as 4 or 8 GB, so the value cannot be used to identify you precisely.
Why does it not show my IP address?
The IP address is only visible to a server. Use the What Is My IP tool, which looks it up for you.
What websites can learn from your browser
Every page you visit can read a surprising amount about the browser that displays it, without asking permission. Some of it is sent automatically with each request, such as the user-agent string and preferred languages. Much more is available to scripts on the page: screen and window sizes, the time zone, whether dark mode is on, how many processor cores the device has, and which features and media formats are supported.
Most of this exists for good reasons. Sites use the viewport size and pixel ratio to choose layouts and image sizes, languages and time zone to show the right translation and local times, and feature checks to decide whether to use a modern technique or a fallback. Support teams ask for the same details because many bugs only appear with a particular browser, screen or setting.
The same values can be combined into a fingerprint that helps recognise a browser across sites. Browsers counter this by rounding or hiding values: memory is reported in coarse steps, user-agent strings are frozen, and some browsers report standardised values in private mode. The Privacy section shows the signals you control, including Global Privacy Control, a setting that legally signals an opt-out of data sale in some regions.
Client hints are the newer, more deliberate channel. Instead of putting everything into one string, Chromium-based browsers offer specific values, such as the platform version or the device model, that a site must ask for. This page asks for them so you can see the exact Windows or Android version where the user-agent string is frozen. Firefox and Safari do not offer these hints.
The report is generated on the page and only leaves your device if you copy or download it and share it yourself. Before attaching it to a public bug report, glance through it: it does not contain your IP address, name or accounts, but details such as your time zone and languages say something about where you are.