Samsung Galaxy S21 Ultra
Full device reference for the Samsung Galaxy S21 Ultra, including viewport size, native resolution, pixel density, DPR, and supporting responsive-design details.
Quick summary
Viewport
384 x 854 PX
Resolution
1440 x 3200 PX
Density
515 PPI
DPR
3.75 XXXHDPI
Viewport
384 x 854 PX
Resolution
1440 x 3200 PX
Density
515 PPI
DPR
3.75 XXXHDPI
What this device means for responsive design
The Samsung Galaxy S21 Ultra uses a viewport of 384 x 854 PX, which makes it a key target for mobile layout testing. Designers and developers should rely on the viewport value for CSS breakpoints, while the native resolution and DPR help explain image sharpness and rendering density.
Example breakpoint
@media (max-width: 384px) {
/* target layouts around Samsung Galaxy S21 Ultra width */
}Display profile
Detailed specifications
A clean reference table for the most important device and display values.
CSS Media Query
@media (min-width: 384px) and (max-width: 384px)Responsive design notes
Use the viewport for layout decisions, the native resolution for asset planning, and the DPR when understanding how CSS pixels map to physical pixels.
Use viewport for CSS
Focus on 384 x 854 PX when planning breakpoints and layout widths.
Use resolution for assets
The native 1440 x 3200 PX resolution helps guide image export sizes and display sharpness.
Use DPR for scaling
A DPR of 3.75 XXXHDPI means this screen maps multiple physical pixels to one CSS pixel.
From the Blog
What Is PPI and Why Does It Matter for Screens?
PPI is the single number that determines whether a screen looks razor-sharp or grainy. Learn how it is calculated and what it means for this device.
Read articleCSS Pixels vs Physical Pixels: The Complete Developer Guide
Your screen has millions of hardware dots. Your CSS has none of them. Learn how Device Pixel Ratio bridges the gap.
Read articleFrequently Asked Questions
What is the screen resolution of the Samsung Galaxy S21 Ultra?
The Samsung Galaxy S21 Ultra has a 1440 x 3200 PX screen resolution on a 6.8 INCH display, resulting in a pixel density of 515 PPI.
What is the CSS viewport size of the Samsung Galaxy S21 Ultra?
The Samsung Galaxy S21 Ultra has a CSS viewport of 384 x 854 PX. This is the value returned by window.innerWidth and window.innerHeight in JavaScript, and the value that CSS media queries respond to.
What CSS media query should I use for the Samsung Galaxy S21 Ultra?
To target the Samsung Galaxy S21 Ultra viewport, use: @media (max-width: 384px). For a mobile-first approach, this targets the device at and above its viewport width.
What is the pixel density (PPI) of the Samsung Galaxy S21 Ultra?
The Samsung Galaxy S21 Ultra has a pixel density of 515 PPI, which corresponds to a device pixel ratio (DPR) of 3.75. This means CSS pixels are scaled up to produce crisp, high-resolution rendering on the physical display.