Samsung Galaxy S25 Ultra Simulator — Viewport, Resolution & CSS Specs
Test your website on Samsung Galaxy S25 Ultra in one click – no real device required.
- Free
- 8,000+ users
The Samsung Galaxy S25 Ultra is a popular device among web developers and designers for testing responsive layouts and mobile UI behavior.
With its screen size and pixel density, it often reveals layout issues that remain hidden on smaller smartphones. Year of release: 2025.
Why Test on Samsung Galaxy S25 Ultra?
Viewport
Samsung Galaxy S25 Ultra uses a tall, wide viewport that often exposes layout, spacing, and navigation issues.
Pixel Density (DPR)
Its high device pixel ratio makes blurry images, icons, and scaling issues immediately visible.
Performance & Animations
Smooth scrolling, transitions, and animations are expected on this device - performance issues quickly stand out.
Viewport Size (CSS Resolution)
The CSS viewport defines how media queries, layout breakpoints, and responsive components behave.
For Samsung Galaxy S25 Ultra, the CSS viewport measures:
- Width: 480 px
- Height: 1040 px
ℹ️ 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.
To see exactly how this viewport behaves in real conditions, you can simulate Samsung Galaxy S25 Ultra directly in your browser using Phone Simulator.
Test on Samsung Galaxy S25 Ultra Now
Accurate viewport simulation directly in your browser.
- No account required
- 30+ devices included
- Works offline
- Free
- 8,000+ users
Pixel Density (Device Pixel Ratio)
Samsung Galaxy S25 Ultra has a device pixel ratio of 3.
Each CSS pixel is rendered using 3 physical pixels, resulting in sharper text and images.
For CSS targeting:
@media only screen and (-webkit-min-device-pixel-ratio: 3) {
/* High-DPI specific styles */
}In JavaScript:
window.devicePixelRatio;
// returns: 3Physical Screen Resolution
Physical resolution refers to the actual number of hardware pixels on the display. While it does not affect CSS layouts, it is commonly shown in analytics and device specifications.
- Width: 1440 px
- Height: 3120 px
ℹ️ Physical resolution is not used for CSS layouts but is often shown in analytics tools.
Frequently Asked Questions
What is the viewport size of Samsung Galaxy S25 Ultra?
480×1040 CSS pixels.
How can I test my website on Samsung Galaxy S25 Ultra?
You can simulate it instantly using the Phone Simulator Chrome extension - no real device required.
How is Phone Simulator better than built-in DevTools?
DevTools shows an approximate viewport size, but does not emulate the real Samsung Internet browser. Phone Simulator uses exact device characteristics and shows how your site renders in a real mobile browser environment.
Can I test localhost with Phone Simulator?
Yes. Phone Simulator works with any local URL, including localhost:3000, 127.0.0.1, and similar setups.
Do I need to buy a Samsung Galaxy S25 Ultra for testing?
No. Phone Simulator provides accurate device simulation for $0 instead of spending $1,299 on a physical device.
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