Narrow viewport
With only 360 pixels wide, Samsung Galaxy S21 is among the most restrictive formats. This is where tables overflow, titles break poorly, and buttons become too small.
Samsung Galaxy S21: CSS viewport of 360 × 800 px, resolution and responsive test
Samsung · Android 11 · Smartphone · 2021
All display characteristics of Samsung Galaxy S21, smartphone Samsung from 2021: CSS viewport of 360 x 800 pixels, 3x density, media queries, and one-click responsive test.
Test your site on Samsung Galaxy S21 directly in your browser, without buying the device.
- Samsung Galaxy S21 available in the device list
- Real viewport, User-Agent, and touch events
- Also works on localhost and in pre-production
- Exportable screenshots and videos
Install the extension
4.9/5 based on 5,100 reviews · 1,000,000 users · free
Why test your site on Samsung Galaxy S21?
3x density
Each CSS pixel of Samsung Galaxy S21 is rendered by 3 physical pixels. Any image, icon, or font provided in simple resolution appears immediately blurry.
Very elongated screen
With a ratio of 20:9, Samsung Galaxy S21 displays a lot of height for little width. Sections designed in landscape become endless columns, and full-screen visuals are poorly cropped.
CSS viewport resolution of Samsung Galaxy S21
This is the resolution that interests designers and developers the most, as it determines breakpoints and the definition of media queries. In practice, it's the only one mentioned in a stylesheet.
- 360 pixels in width
- 800 pixels in height
The height remains indicative: Safari, Chrome, and other mobile browsers reduce the visible area with their address bar, which folds on scroll.
Be cautious when analyzing your statistics: some tools only report the manufacturer resolution, never the CSS viewport presented here.
Pixel density of Samsung Galaxy S21
3
The device pixel ratio of Samsung Galaxy S21 is 3.
In other words, a 1-pixel square in CSS occupies 3 pixels on the panel. An image exported at actual size will appear blurry.
Manufacturer resolution of Samsung Galaxy S21
This resolution is the hardware's. It explains the display's sharpness, but it's never the one to target in a media query.
- 1080 pixels in width
- 2400 pixels in height
- 20:9 Screen ratio
424 pixels per inch (ppi) · 6.2 inches diagonal, or 15.8 cm
Media queries and code snippets for Samsung Galaxy S21
These snippets are generated from the exact characteristics of Samsung Galaxy S21. Copy them directly into your stylesheet or configuration.
CSS media query
Targets screens whose width matches that of Samsung Galaxy S21 and models of the same format.
@media only screen and (min-width: 360px) and (max-width: 799px) {
/* Samsung Galaxy S21 */
}Density media query
Serves high-resolution images to screens of at least 3x.
@media only screen and (-webkit-min-device-pixel-ratio: 3),
only screen and (min-resolution: 288dpi) {
/* High-density images and icons */
}Tailwind configuration
Adds a named breakpoint at the exact width of Samsung Galaxy S21.
// tailwind.config.js
module.exports = {
theme: {
screens: {
'samsung-galaxy-s21': '360px'
}
}
}JavaScript detection
Detects format and density client-side.
const isDeviceWidth = window.matchMedia('(min-width: 360px)').matches;
const isHighDensity = window.devicePixelRatio >= 3;Meta viewport tag
Essential for Samsung Galaxy S21 to use its CSS viewport and not a simulated width of 980 pixels.
<meta name="viewport" content="width=device-width, initial-scale=1">Free Samsung Galaxy S21 simulator
Mobile FIRST includes Samsung Galaxy S21: your page displays in a viewport of 360 x 800 pixels, with the model's User-Agent, touch events, and scrolling behavior of a real mobile.
This is where the difference with Chrome DevTools' responsive mode is seen: DevTools resizes a window, the extension replicates the device's browser and allows exporting shareable screenshots and videos.
- 01 Install the extension Add Mobile FIRST to Chrome, Firefox, or Edge. Installation is free and requires no account.
- 02 Open the page to test Go to the URL to check, including a local address like localhost:3000.
- 03 Choose Samsung Galaxy S21 Select Samsung Galaxy S21 from the list of devices. The viewport switches to 360 x 800 pixels, and the mobile User-Agent is applied.
- 04 Check rendering Scroll, change orientation, test your forms, then capture an image or video to share.
Models sharing the format of Samsung Galaxy S21
These 4 devices share exactly the viewport of 360 x 800 pixels and the 3x density of Samsung Galaxy S21. Their CSS rendering is therefore exactly the same: what you validate on one is valid on all others.
Comparison with similar models
The neighboring formats of Samsung Galaxy S21 are the ones to test right after, as they reveal poorly placed breakpoints.
| Model | CSS Viewport | Pixel density | Manufacturer resolution |
|---|---|---|---|
| Samsung Galaxy S21 | 360 x 800 | 3x | 1080 x 2400 |
| Samsung Galaxy S22 | 360 x 780 | 3x | 1080 x 2340 |
| Samsung Galaxy S22+ | 360 x 780 | 3x | 1080 x 2340 |
| Apple iPhone 12 Mini | 360 x 780 | 3x | 1080 x 2340 |
| Samsung Galaxy S20 | 360 x 800 | 3x | 1440 x 3200 |
| Xiaomi Mi 11i | 360 x 800 | 3x | 1080 x 2400 |
| Xiaomi 12 2022 | 360 x 800 | 3x | 1080 x 2400 |
Frequently asked questions about Samsung Galaxy S21
What is the CSS viewport resolution of Samsung Galaxy S21?
The CSS viewport of Samsung Galaxy S21 measures 360 pixels wide and 800 pixels high. This is the width to use for defining your media queries, not the manufacturer's resolution.
What is the pixel density of Samsung Galaxy S21?
The device pixel ratio of Samsung Galaxy S21 is 3. Each CSS pixel is thus displayed by 3 physical pixels, requiring you to provide your images in 3x to keep them sharp.
What is the screen resolution of Samsung Galaxy S21?
The panel of Samsung Galaxy S21 displays 1080 x 2400 physical pixels. This is the value reported by most analytics tools, while your CSS works on a viewport of 360 x 800 pixels.
Which devices have the same viewport as Samsung Galaxy S21?
4 other models share exactly the viewport of 360 x 800 pixels and the 3x density of Samsung Galaxy S21: Samsung Galaxy S20, Samsung Galaxy S21+, Xiaomi 12 2022, Xiaomi Mi 11i. A rendering validated on one is valid on all others.
How to test my site on Samsung Galaxy S21 without the device?
Install the Mobile FIRST extension on Chrome, Firefox, or Edge, then select Samsung Galaxy S21. Your page displays in a viewport of 360 x 800 pixels with the corresponding mobile User-Agent, in two clicks and for free.
What is the difference with Chrome DevTools' responsive mode?
DevTools resizes the window and applies partial emulation. Mobile FIRST additionally applies the User-Agent of Samsung Galaxy S21, touch events, scroll behavior, and the actual appearance of the device, and allows capturing directly usable images and videos.
Can I test a localhost address on Samsung Galaxy S21?
Yes. The extension works on any URL open in your browser, including localhost:3000, 127.0.0.1, or a password-protected pre-production environment.
Do you need to buy a Samsung Galaxy S21 to test your site?
No. The simulation covers the vast majority of development needs at no cost. A final test on a real device is still recommended before critical production deployment, but it's no longer necessary for each iteration.
Which media query to use to target Samsung Galaxy S21?
A media query on the exact width targets Samsung Galaxy S21: @media only screen and (min-width: 360px). Combine it with the pixel density to precisely target this model and those sharing its format.
Test your site on 77 devices, directly in your browser
Without buying a single phone, without creating an account.
- 77 devices available upon installation
- Real viewport, User-Agent, and touch events
- Also works on localhost and in pre-production
- Exportable screenshots and videos
Install the extension
Free installation in seconds · computer only