By Debmedia Technologies LLP · Kolkata, India · Updated
What Is a Screen Resolution Simulator?
A screen resolution simulator shows a website inside a frame that has the exact width and height of another device. The page inside the frame thinks the screen is that size, so its responsive layout, media queries and mobile menus switch the way they would on a real phone, tablet or laptop.
It is a fast way to check a design without owning every device. This screen resolution simulator offers common presets and custom sizes, and scales large screens down so they fit on your display.
How to Use This Tool
- Enter the website address, such as example.com.
- Pick a screen size from the list, or choose Custom size and type a width and height.
- Optionally rotate it to see landscape instead of portrait.
- Press Show preview and look at the frame below.
Available Screen Sizes
| Device | Size in pixels |
|---|---|
| iPhone SE | 375 x 667 |
| iPhone 15 | 393 x 852 |
| Android phone | 360 x 780 |
| iPad | 768 x 1024 |
| iPad Pro | 1024 x 1366 |
| Laptop | 1366 x 768 |
| Desktop | 1920 x 1080 |
Layouts respond to width through the techniques described in the MDN guide to responsive design.
What This Tool Cannot Do
- Sites that forbid framing. Many websites send headers such as X-Frame-Options that stop other pages from showing them. Their frame stays blank, and no tool can override that.
- Real device behavior. Only the size changes. Fonts, touch input, browser menus and the phone’s own quirks are not reproduced.
- Plain http pages. Browsers block insecure pages inside a secure page, so use the https address.
If a preview stays blank, check whether the site allows framing by reading its headers with the header viewer.
What to Look for When Testing
Navigation
On narrow sizes the menu should collapse into a button, and every link should stay reachable.
Text and images
Text must stay readable without zooming, and images should not overflow the screen sideways.
Touch targets
Buttons and links should be large enough to tap, at least about 44 pixels.
Related Tools
Find your own screen size with the screen resolution checker. To check page weight on mobile networks, use the page size tool, and to confirm a viewport tag exists, run the meta tag review.
When to Use a Simulator
Run a quick preview after each design change, before a launch and when a customer reports that a page looks broken on their phone. It will not replace a test on real devices, but it catches most layout problems in seconds and costs nothing. Check at least one small phone, one tablet and one wide laptop size, and rotate each to landscape.
Keep an eye on text that wraps badly, buttons that overlap and images that spill outside the screen.
Frequently Asked Questions
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