Screen Resolution Simulators: Test Your Website on Every Device

About this video

Your website may look perfect on your laptop and broken on a phone. Screen resolution simulators show your site at the sizes of popular devices, so you can catch layout problems before visitors do.

This video shows how to use online simulators and the device mode built into Chrome and Edge to test any page quickly.

What you will learn

• Why responsive testing matters
• Using online screen resolution simulators
• Chrome and Edge device mode (DevTools)
• Common problems: overflowing text, small buttons, hidden menus
• Confirming fixes on a real phone

Quick answers

Is a simulator as good as a real phone?

It is good for layout checks. Always test the final version on at least one real phone too.

Which screen sizes should I test?

At least a small phone (360 px), a large phone (414 px), a tablet (768 px) and a laptop (1366 px).

Try it yourself: Press F12 in Chrome, turn on device mode and test your home page at 360 px wide.