What's my browser size?

Use WebFX's browser size tool by visiting the page (like you are now) and looking at the mock browser in the center of the screen. This mock browser will provide your browser size.
Adjust your browser to see the dimensions change in real-time.
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The difference between browser size and screen resolution is what they measure. Browser size measures the space in which the browser displays while screen resolution is the total number of monitor pixels.
Unlike screen resolution, browser size considers:

• Browser toolbars
• Browser scrollbars
• Browser size customizations (like a minimized or maximized window)

Browser sizes change when zooming in and out because zooming changes the amount of viewport space available. You can use this feature to understand how your site appears across device sizes.

Browser size impacts responsive design because the size of a user's browser triggers a website's responsive design. When a user resizes their browser (or opens a browser on a smaller screen resolution), websites detect this change and respond in their display layout.

Browser size impacts digital marketing because the browser is the user's gateway to the Internet (which is where digital marketing happens). That means marketers must consider browser size across strategies, like:

• Conversion rate optimization
• AI search and SEO
• Digital advertising

Marketers can better understand the impact of browser size through Google Analytics 4, which shares the devices and screen resolutions of the people visiting your website.

You can track the browser sizes visiting your website using Google Analytics 4. Once installed on your website, Google Analytics 4 will begin capturing metrics and dimensions like:

• Browser
• Operating system
• Device category
• Screen resolution
• And more

While Google Analytics 4 does not track browser size directly, marketers have found a workaround in creating a custom variable in Google Tag Manager that uses JavaScript to measure a user's browser size.

Browser size impacts conversion rate optimization because it impacts what users see when landing on your site. For example, browser size can influence what appears above the fold (or before users need to scroll). That's why marketers need to lean into device-agnostic layouts.

Browser size impacts AI search and SEO because search engines like Google use mobile-first indexing and Core Web Vitals, which consider the accessibility and performance of sites across devices.

Browser size impacts digital advertising because how ads display on devices (think display ads on a website) can impact their visibility and performance (along with your ROAS).

Yes! In our experience, we've observed business buyers using larger browser sizes than consumers, which is often due to buyers researching on their desktop while consumers browse the web on mobile devices.