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How to Change User Agents in Chrome, Edge, Safari & Firefox

SEO professionals can change their browser's user-agent to identify issues with cloaking or audit websites on different devices. Learn the process here.

Whether you are an SEO, marketer, or web developer, often you might need to change your browser’s user-agent to test different things.

For example, you’re running a MAC-OS-specific campaign. To find out if your campaign is running properly and not targeting Linux users, changing the user-agent of your browser can help you test.

For web developers, changing user-agents is almost a daily task in order to test how websites behave in different browsers and devices.

What Is a User-Agent?

A user-agent is an HTTP request header string identifying browsers, applications, or operating systems that connect to the server.

Not only browsers have user-agents, but also bots, crawlers such as search engines Googlebot, Google AdSense, etc.

HTTP header user-agent

Here we are going to learn how to change the user-agent of your browser.

The process is called user-agent spoofing.

Yes, when a browser or any client sends a different user-agent HTTP header from what they are and fake it that is called spoofing.

While the term may be alarming, this is not a dangerous activity and will not cause any problems for you. (So feel free to spoof your user-agent as much as you want. 🙂)

How to Change Your User-Agent on Chrome & Edge

Since Microsoft Edge is now using Chromium, the settings for both Chrome and Edge are the same.

1. Right Click Anywhere in Webpage > Inspect

Alternatively, you can use CTR+Shift+I on Windows, Cmd + Opt +J on Mac.

where is google chrome's inspect code

2. Choose More Tools > Network Conditions

Click on the three vertical dots on the upper right corner.

Chrome network conditions

3. Uncheck Select Automatically Checkbox

chrome network conditions

4. Choose One Among the Built-In User-Agents List

Change user agent in Chrome Edge

If the user-agent you want doesn’t exist, you can enter any string you want on the field below the list.

For example, you can enter the following (Googlebot’s user-agent) into the custom field.

Mozilla/5.0 (compatible; Googlebot/2.1; +

This may be useful for SEO professionals to identify if there is a cloaking on the website when the webpage shows different content to Googlebot and another to website visitors.

Alternatively, you can use the Chrome extension User-Agent Switcher and Manager.

That said, I try not to use browser extensions when the browser can actually do the action I want. This is to avoid overloading the browser with tons of add-ons.

Also, extensions have a habit to break websites unexpectedly sometimes.

While you might think the website you visited has an issue, the root cause can be one of the add-ons you’re using.

How to Change User-Agent on Safari

1. Go to Preferences

Safari browser preferences

2. Enable Develop Menu Bar

Go to Advanced and check Show Develop menu in menu bar.

3. Navigate to Develop > User-Agent

Safari's develop menu. User agent

You can again select from a predefined list or enter custom user-agent string by choosing “Other…”

Safari custom user agent setting

How to Change User-Agent in Firefox

In Firefox, it is possible to change user-agents via the browser’s built-in settings.

However, it is not as user-friendly as on Chrome or Safari.

It is a real pain to use the browser’s built-in feature.

Instead, we will use a Firefox add-on called User-Agent Switcher.

After installing the add-on, you will see an icon in the upper right corner.

You can select one of the predefined user-agents or enter a custom user-agent by clicking on the pen icon below.

Firefox User-Agent Switcher extension

Another extension you can use is User-Agent Switcher and Manager.

Firefox User-Agent Switcher and Manager extension


The user-agents are easy to spoof and anyone can use these easy tricks to alter it.

This feature is useful for testing web apps against various devices especially when one has different HTML for mobile or tablet devices.

One doesn’t need to have many physical devices to be able to test.

This feature is useful for SEO professionals, for example, to identify issues with cloaking which is against Google’s Webmaster Guidelines or auditing websites which has different look depending on the device.

More Resources:

Image Credits

All screenshots taken by author, May 2020


What is a user agent?

User agent is a HTTP request header string identifying browser, application, operating system which connects to the server. Not only browsers have user agent but also bots, search engines crawlers such as Googlebot, Google Adsense etc. which are not browsers.

What is user-agent spoofing?

When browser or any client sends different user-agent HTTP header from what they are and fakes it that is called spoofing.

Category Web Dev SEO
SEJ STAFF Vahan Petrosyan Director of Technology at Search Engine Journal

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How to Change User Agents in Chrome, Edge, Safari & Firefox

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