Samsung Galaxy J4: CSS viewport of 360 × 640 px, resolution and responsive test

Samsung · Android 8.0 · Smartphone · 2018

Released in 2018, Samsung Galaxy J4 features a CSS viewport of 360 x 640 pixels. Here are all its display characteristics and how to check the responsive rendering of your site on this model.

Test your site on Samsung Galaxy J4 directly in your browser, without buying the device.

  • Over 70 devices included, including a model with the same format
  • Real viewport, User-Agent, and touch events
  • Also works on localhost and in pre-production
  • Exportable screenshots and videos
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Why test your site on Samsung Galaxy J4?

Narrow viewport

With only 360 pixels wide, Samsung Galaxy J4 is among the most restrictive formats. This is where tables overflow, titles break poorly, and buttons become too small.

Older hardware

The hardware of Samsung Galaxy J4 dates from 2018. Its processor makes costly animations, heavy scripts, and display times visible that recent devices mask.

2x density

With a density of 2x, Samsung Galaxy J4 provides a useful benchmark to ensure your images remain sharp without serving unnecessarily large files.

CSS viewport resolution of Samsung Galaxy J4

This resolution is what your stylesheet actually manipulates. It determines the applied breakpoint, the number of displayed columns, and the size of your images.

  • 360 pixels in width
  • 640 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 J4

2

The device pixel ratio of Samsung Galaxy J4 is 2.

Each CSS pixel is thus rendered by 2 physical pixels, making any image provided in simple resolution immediately visible.

Manufacturer resolution of Samsung Galaxy J4

This is the number of physical pixels on the screen, as announced by the manufacturer. Useful for preparing your image exports, useless for your media queries.

  • 720 pixels in width
  • 1280 pixels in height
  • 16:9 Screen ratio

267 pixels per inch (ppi) · 5.5 inches diagonal, or 14 cm

Media queries and code snippets for Samsung Galaxy J4

These snippets are generated from the exact characteristics of Samsung Galaxy J4. Copy them directly into your stylesheet or configuration.

CSS media query

Targets screens whose width matches that of Samsung Galaxy J4 and models of the same format.

@media only screen and (min-width: 360px) and (max-width: 639px) {
  /* Samsung Galaxy J4 */
}

Density media query

Serves high-resolution images to screens of at least 2x.

@media only screen and (-webkit-min-device-pixel-ratio: 2),
       only screen and (min-resolution: 192dpi) {
  /* High-density images and icons */
}

Tailwind configuration

Adds a named breakpoint at the exact width of Samsung Galaxy J4.

// tailwind.config.js
module.exports = {
  theme: {
    screens: {
      'samsung-galaxy-j4': '360px'
    }
  }
}

JavaScript detection

Detects format and density client-side.

const isDeviceWidth = window.matchMedia('(min-width: 360px)').matches;
const isHighDensity = window.devicePixelRatio >= 2;

Meta viewport tag

Essential for Samsung Galaxy J4 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 J4 simulator

Mobile FIRST does not yet include Samsung Galaxy J4, but a model with the same format is available. You can already validate your breakpoints and display density.

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.

  1. 01 Install the extension Add Mobile FIRST to Chrome, Firefox, or Edge. Installation is free and requires no account.
  2. 02 Open the page to test Go to the URL to check, including a local address like localhost:3000.
  3. 03 Choose Samsung Galaxy J4 Select Samsung Galaxy J4 from the list of devices. The viewport switches to 360 x 640 pixels, and the mobile User-Agent is applied.
  4. 04 Check rendering Scroll, change orientation, test your forms, then capture an image or video to share.

Models sharing the format of Samsung Galaxy J4

These 5 devices share exactly the viewport of 360 x 640 pixels and the 2x density of Samsung Galaxy J4. 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 J4 are the ones to test right after, as they reveal poorly placed breakpoints.

Comparison of resolutions of Samsung Galaxy J4 and nearby models
Model CSS Viewport Pixel density Manufacturer resolution
Samsung Galaxy J4 360 x 640 2x 720 x 1280
Apple iPhone SE 320 x 568 2x 640 x 1136
Apple iPhone 5 320 x 568 2x 640 x 1136
Samsung Galaxy J5 Prime 360 x 640 2x 720 x 1280
Samsung Galaxy J5 360 x 640 2x 720 x 1280
Apple iPhone SE 375 x 667 2x 750 x 1334
Samsung Galaxy A12 360 x 800 2x 720 x 1600

Frequently asked questions about Samsung Galaxy J4

What is the CSS viewport resolution of Samsung Galaxy J4?

The CSS viewport of Samsung Galaxy J4 measures 360 pixels wide and 640 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 J4?

The device pixel ratio of Samsung Galaxy J4 is 2. Each CSS pixel is thus displayed by 2 physical pixels, requiring you to provide your images in 2x to keep them sharp.

What is the screen resolution of Samsung Galaxy J4?

The panel of Samsung Galaxy J4 displays 720 x 1280 physical pixels. This is the value reported by most analytics tools, while your CSS works on a viewport of 360 x 640 pixels.

Which devices have the same viewport as Samsung Galaxy J4?

5 other models share exactly the viewport of 360 x 640 pixels and the 2x density of Samsung Galaxy J4: HTC Desire 10 Lifestyle, HTC Desire 628, Samsung Galaxy J5, Samsung Galaxy J5 Prime, Samsung Galaxy J7. A rendering validated on one is valid on all others.

How to test my site on Samsung Galaxy J4 without the device?

Install the Mobile FIRST extension on Chrome, Firefox, or Edge, then select Samsung Galaxy J4. Your page displays in a viewport of 360 x 640 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 J4, 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 J4?

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 J4 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 J4?

A media query on the exact width targets Samsung Galaxy J4: @media only screen and (min-width: 360px). Combine it with the pixel density to precisely target this model and those sharing its format.

Continue testing on another model

All Samsung resolutions → All devices →

Other Samsung models

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

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