How to Simulate a Foldable Mobile Device in Google Chrome

 

Foldable mobile devices are becoming increasingly popular, with major smartphone manufacturers like Samsung, Google, and Huawei launching innovative foldable designs. If you're a web developer or UI/UX designer, testing your website or application on a foldable device is crucial to ensuring compatibility and responsiveness. Fortunately, Google Chrome provides built-in tools that allow you to simulate a foldable mobile device directly in your browser.

In this guide, we will walk you through the process of simulating a foldable mobile device in Google Chrome using DevTools.

Why Simulate a Foldable Mobile Device?

Before diving into the steps, let's discuss why simulating a foldable mobile device is beneficial:

  1. Ensuring Responsive Design: Websites and web apps should adapt smoothly to different screen sizes and form factors.
  2. Testing Multi-Window Features: Foldable phones introduce multi-window usage and different screen postures that can affect user interaction.
  3. Detecting UI/UX Issues: Foldable screens bring new interaction challenges, such as handling the hinge area and transitions between folded and unfolded states.
  4. Reducing Physical Testing Costs: Instead of purchasing expensive foldable devices, developers can use Chrome's simulation feature to test their projects.

Step-by-Step Guide to Simulating a Foldable Mobile Device in Chrome

Step 1: Open Chrome DevTools

To begin, open Google Chrome and navigate to the website or web application you want to test. Then follow these steps:

  1. Right-click anywhere on the page and select Inspect, or press Ctrl + Shift + I (Windows/Linux) or Cmd + Option + I (Mac) to open Chrome DevTools.
  2. Click on the Device Toolbar (a small mobile icon) or press Ctrl + Shift + M (Windows/Linux) or Cmd + Shift + M (Mac) to enable device mode.

Step 2: Select a Foldable Device

Once you have entered the device mode, you can select a predefined foldable device from Chrome's device list:

  1. Click on the Responsive dropdown at the top of the viewport.
  2. Scroll down and look for foldable devices like Samsung Galaxy Fold or Samsung Galaxy Z Flip.
  3. Select the desired device to simulate its screen size and resolution.

If the exact device you need is not listed, you can manually add a custom device with the required dimensions and screen resolution.

Step 3: Enable the Foldable Mode in Chrome DevTools

To fully simulate foldable behavior, Chrome offers a special rendering mode for foldable screens:

  1. In DevTools, click on the three-dot menu in the top-right corner.
  2. Navigate to More Tools → Rendering.
  3. Scroll down to the section labeled Emulate CSS media feature prefers-reduced-motion.
  4. Look for the Emulate Foldable Device option and enable it.

This will allow you to simulate different screen states such as half-folded, fully opened, and partially closed modes.

Step 4: Adjust the Fold State

Some websites and applications behave differently depending on the fold state. You can adjust this setting in Chrome:

  1. Open the Rendering tab inside DevTools.
  2. Locate the Emulate Foldable Mode dropdown.
  3. Choose between different options like:
    • Unfolded (Open Mode)
    • Folded (Closed Mode)
    • Half-Folded (Laptop Mode)

Testing different modes ensures that your website or app handles foldable transitions effectively.

Additional Testing Features

1. Test Multi-Screen Layouts

Foldable devices often support multi-screen layouts where one part of the screen displays a different UI. Chrome allows you to simulate this using CSS media queries such as:

@media (device-fold-posture: folded) {
  .content {
    display: flex;
    flex-direction: column;
  }
}

2. Test Viewport Units and Breakpoints

Foldable devices use different viewport units, so testing CSS properties like vh, vw, and flex-based layouts ensures smooth transitions.

3. Debug JavaScript Features

If your app has specific JavaScript behaviors triggered by screen size changes, use window.matchMedia() to detect fold states:

if (window.matchMedia("(device-fold-posture: folded)").matches) {
  console.log("Device is in folded mode");
}

Best Practices for Foldable Design

When designing for foldable devices, consider these best practices:

  1. Optimize for Multi-Window Use: Ensure your UI supports drag-and-drop and split-screen interactions.
  2. Handle Hinge Interactions: Avoid placing crucial UI elements where the hinge is located.
  3. Use Responsive Media Queries: Adjust layouts dynamically based on screen mode.
  4. Ensure Smooth Animations: Test transitions when folding and unfolding the device.
  5. Test Across Different Foldable Devices: Each manufacturer may implement foldable screens differently, so testing across various brands is important.

Conclusion

Simulating foldable mobile devices in Google Chrome is an essential skill for developers and designers aiming to optimize their web applications for the next generation of smartphones. By following the steps outlined in this guide, you can accurately test and refine your website's responsiveness, usability, and functionality on foldable screens without needing a physical device.

Chrome DevTools provides a robust set of features to emulate foldable devices, adjust fold states, and test multi-screen layouts. By leveraging these tools, you can ensure that your applications provide a seamless experience across traditional and foldable smartphones.

Are you ready to test your website on foldable devices? Open Chrome DevTools today and start experimenting!

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