Skip to main content
Premier SEO Services

Menu

Tool categories

Browse all 172 tools A–Z

Website performance tools

Cross Browser Tester

Preview a page at several phone, tablet and desktop sizes side by side in the browser you're using now. It doesn't test other browser engines; the notes explain how to do that.

  • Runs in your browser
  • Free, no sign-up
  • Unlimited use
  • Updated 30 September 2026

Limited tool. This page does less than its name suggests; the notes below explain exactly what it can and can't do.

Cross Browser Tester

Enter a web address to run the check

  • Uses your current browser only; your browser loads the page directly from the site.
  • Sites that forbid embedding show a blank frame.

How to use the cross browser tester

  1. 1Enter the page URL.
  2. 2Tick the Screen sizes to compare, or add a Custom size.
  3. 3Press Show previews. Use Reload on a frame or Open in new tab if a site won't embed.

Rendering engines vs browser brands

There are three browser engines in wide use: Blink (Chrome, Edge, Opera, Samsung Internet, Brave), WebKit (Safari, and every browser on iPhone and iPad) and Gecko (Firefox). Cross-browser bugs come from engine differences, not brand names. This preview uses whichever engine you're running now, so it tests layouts at different widths, not engines. Open the page in each engine, or use a testing service that runs real browsers, to catch engine-specific problems.

What screenshots can and can't show

A resized frame shows breakpoints, overflowing content, wrapped navigation and images that don't scale. It can't show touch behavior, the on-screen keyboard, notches and browser toolbars, real device fonts, or performance on slower hardware. It also loads the page as a frame, so cookie banners and logins may behave differently than in a normal tab.

Common cross-browser layout bugs

  • 100vh sections hidden behind mobile browser toolbars (use 100dvh).
  • Form controls and date pickers that look different in each engine.
  • Newer CSS (for example :has(), container queries, subgrid) in older browser versions.
  • Flexbox gap and sticky positioning quirks in older Safari.
  • Fonts that fall back differently when a web font fails.

Check support on MDN's compatibility tables before relying on a feature.

Testing on real devices

For a quick check, borrow phones from people around you: one iPhone (WebKit) and one Android phone (Blink) cover most visitors. Desktop browsers' device modes (Chrome DevTools, Firefox Responsive Design Mode, Safari's Responsive Design Mode) emulate sizes and touch on your computer. Commercial services provide real browsers and devices remotely when you need older versions or many combinations.

What happens to the address I enter?

This tool runs entirely in your browser. Your input is not uploaded to our servers.

Sources

Questions about the cross browser tester

Is Safari the same as WebKit?

Safari is built on WebKit, and on iPhone and iPad every browser, including Chrome and Firefox, must use WebKit. So testing in iOS Chrome is effectively testing WebKit.

Can I test old Internet Explorer?

Not here. Microsoft ended support for Internet Explorer in 2022; Edge has an IE mode for old intranet sites, and few public sites still need to support IE.

Why does my site look different on iPhone?

iPhones use WebKit, have different default fonts and form controls, and their toolbars change the visible height. Test in Safari on a real iPhone or in Safari's Responsive Design Mode on a Mac.

Last updated 30 September 2026Maintained by Premier SEO Services

Report a problem