Samsung Galaxy S25 Ultra – Viewport, Resolution & Specs

Samsung Galaxy S25 Ultra - Available in Chrome Extension

The Samsung Galaxy S25 Ultra is one of the most popular modern smartphones for web designers and front-end developers to test responsive layouts.

If you want to check how your website looks and behaves on this device, you can easily simulate it using the Phone Simulator – Mobile Emulator Tool Chrome extension — no real device required.

Viewport Size (CSS Resolution)

This is the resolution that matters most to designers and developers — it defines media query breakpoints, layout scaling, and how elements adapt to the screen.

For the Samsung Galaxy S25 Ultra, the CSS viewport measures:

  • Width: 480 px
  • Height: 1040 px*

ℹ️ Note: The visible height can vary slightly depending on the browser UI (Safari, Chrome, etc.).

Some analytics platforms only display the physical screen resolution (see below) instead of the CSS viewport size, so keep that in mind when interpreting results.

Test on Samsung Galaxy S25 Ultra Instantly

Preview your responsive website on the Samsung Galaxy S25 Ultra right inside your browser.

Install the Phone Simulator – Mobile Emulator Tool and test across 30+ mobile devices with just two clicks. It’s fast, free, and doesn’t require any external services.

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Pixel Density (Device Pixel Ratio)

The Samsung Galaxy S25 Ultra has a device pixel ratio of 3 — meaning each CSS pixel is represented by three physical pixels.

This ensures sharper visuals, crisper text, and smoother icons on high-resolution displays.

For CSS targeting:

@media only screen and (-webkit-min-device-pixel-ratio: 3) { 
    /* High-DPI specific styles */ 
}

In JavaScript:

window.devicePixelRatio 
// returns: 3

Physical Screen Resolution

Based on its pixel density, the manufacturer’s screen resolution equals:

  • Width: 1440 px
  • Height: 3120 px
The Samsung Galaxy S25 Ultra provides a large, high-definition display ideal for testing responsive layouts, images, and typography.

About the Samsung Galaxy S25 Ultra

The Samsung Galaxy S25 Ultra released in 2025.

Samsung Galaxy S25 Ultra combines cutting-edge hardware with a premium display, making it a top choice for modern Android layout testing.

Using the Phone Simulator – Mobile Emulator Tool, developers can preview websites exactly as they would appear on this device — helping ensure a consistent user experience across screens.

Try It Now 💫

Start testing your website on the Samsung Galaxy S25 Ultra and other smartphones and tablets directly in Chrome.

No physical devices, no setup — just realistic mobile previews.

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