How to Simulate a Mobile Browser (Edge/Safari User-Agent Switching)

Many people know that the User-Agent can be used to “disguise the browser,” but how to actually operate it—especially switching it in Edge and Safari—is often unclear.

Nowadays, platforms no longer rely on just a single UA; they also combine browser fingerprinting to determine your real environment. If you simply “change the UA casually,” it’s very easy to be detected.

Next, we’ll start with the basics of User-Agent parsing, and then guide you step by step on how to switch it in Edge and Safari.

1. What is User-Agent? Why switch it?

Simply put, the User-Agent (UA) is a piece of “identity information” that the browser actively sends to the server when accessing a website. It usually includes:

•  Browser type (Chrome / Safari / Edge, etc.)

•  Operating system (Windows / macOS / iOS / Android)

•  Device type (PC / mobile / tablet)

•  This is also the core content of what we call User-Agent parsing.

Especially in security testing or data analysis, UA is only part of the “browser fingerprint.” It is often combined with resolution, fonts, Canvas, and other information to identify users.

2. Switching User-Agent in Edge Browser

Edge (Chromium-based) is actually very easy to operate:

Step 1: Open Developer Tools

Use shortcut keys:

Windows: F12 or Ctrl + Shift + I

Mac: Cmd + Option + I

Step 2: Enter Device Emulation Mode

Click the “phone + tablet” icon (Toggle Device Toolbar) in the top-left corner

Step 3: Select Device or Customize UA

You can directly choose devices like iPhone, Pixel, iPad, etc., and Edge will automatically switch to the corresponding User-Agent.

For more precise control, click the three-dot menu in the top-right corner, select More tools → Network conditions, uncheck “Use browser default,” and choose or customize a User-Agent from the dropdown.

👉 Tip: This method is suitable for temporary testing and will not permanently modify the browser.

3. Correct Way to Switch User-Agent in Safari

Step 1: Enable Develop Menu

Open Safari → go to “Preferences” → click “Advanced,” and check “Show Develop menu in menu bar.”

Step 2: Switch User-Agent

In the menu bar: Develop → User Agent

You will see a list of options such as Safari iOS, Chrome Windows, Firefox, etc. Click to switch directly.

Step 3: Customize UA (Advanced)

Safari does not support directly entering a custom UA by default, but you can modify request headers via developer tools or use extensions.

4. How to Verify if the Switch Was Successful?

After switching the UA, it is recommended to verify it. You can use the ToDetect fingerprint checking tool to inspect:

•  User-Agent parsing results

•  IP information

•  Browser type

It can also detect deeper factors such as Canvas fingerprint, WebGL fingerprint, timezone, language, etc., which are all important parts of browser fingerprinting.

5. User-Agent Switching ≠ Complete Anonymity

Many people think changing the UA makes them “invisible,” but this is a misconception. Modern websites rely more on:

•  Browser fingerprint

•  Behavioral characteristics (e.g., mouse movement)

•  IP + geolocation

•  In other words, UA is only the “first layer of disguise.” If you are doing crawler testing, ad verification, or multi-account isolation,

you will need to combine fingerprint browsers, proxy IPs, and cookie isolation together.

6. User-Agent Switching Comparison Table Across Browsers

Conclusion

Switching the User-Agent is just a starting point, not the end. It is more like an “entry-level disguise,” suitable for basic testing or simple scenario simulation.

Remember to verify after each UA change using tools like the ToDetect fingerprint checker, rather than relying only on page changes.

If you are only doing simple debugging, switching UA is enough; but for more complex environment simulation, you need to further understand browser fingerprinting mechanisms.