What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

Change User Agent Bing

James Lee
• Tuesday, 05 July, 2022
• 7 min read

If you ever wanted to make your web traffic seem like it was coming from a different browser–say, to trick a site that claims it’s incompatible with yours–you can. This allows you to request web pages intended for different browsers–or even different devices, like smartphones and tablets.

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Click the menu button to the right of the “Console” tab at the bottom of the Developer Tools pane and select “Network Conditions” If you don’t see the console at the bottom, click the menu button in the top right corner of the Developer Tools pane–that’s the button just to the left of the “x”–and select “Show Console”.

On the Network conditions tab, uncheck “Select automatically” next to User agent. It only works while you have the Developer Tools pane open, and it only applies to the current tab.

To create the preference, right-click on the about:config page, point to New, and select String. This setting applies to every open tab and persists until you change it, even if you close and reopen Firefox.

To revert Firefox to the default user agent, right-click the “general.user agent.override” preference and select Reset. Microsoft Edge and Internet Explorer have user agent switchers in their developer tools, and they’re nearly identical.

To open them, click the settings menu and select “F12 Developer Tools” or just press F12 on your keyboard. The developer tools will open in a separate pane at the bottom of the window.

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You can find extensive lists of user agents on various websites, such as this one. It only applies to the current tab, and only while the F12 Developer Tools pane is open.

Chris has written for The New York Times, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. Since 2011, Chris has written over 2,000 articles that have been read more than 500 million times---and that's just here at How-To Geek.

User agent is an 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 Google bot, Google AdSense etc.

Evergreen Bingo, the version of Bingo that is able to crawl the web like a modern browser, is currently in use but will be used to “cover all the sites” over the “coming months.” With that, Bing will begin using a new user agent to convey which version of Bingo is crawling your website. Bing will use an user agent that identifies the specific version of Microsoft Edge is crawling your site.

“W.×.Y.Z” will be substituted with the latest Microsoft Edge version Bing is using, for e.g. Bing .com/bingbot.htm) Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; RV:11.0; Immobile/11.0; NOKIA; Lucia 530) like Gecko (compatible; bingo/2.0; +http://www.


Google is currently testing the new user agents, so you may be able to see them in your log files. But it can impact your site if you had any user agent detection methods for Bingo and/or Guillemot.

Most sites probably do not need to worry about this but you have done any advanced bot detection, you may need to take steps to update those scripts. Barry Schwartz a Contributing Editor to Search Engine Land and a member of the programming team for Six events.

He owns RustyBrick, a NY based web consulting firm. As announced in October, Bing is adopting the new Microsoft Edge as the engine to run JavaScript and render web pages.

We have already switched to Microsoft Edge for thousands of websites “under the hood”. This evolution was transparent for most of the sites, and we carefully tested to check whether each website is rendering fine on switching to Microsoft Edge.

Over the coming months, we will scale this migration to cover all the sites. Bing .com/bingbot.htm) Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; RV:11.0; Immobile/11.0; NOKIA; Lucia 530) like Gecko (compatible; bingo/2.0; +http://www.

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We are committing to regularly update our web page rendering engine to the most recent stable version of Microsoft Edge thus making the above user agent strings to be evergreen. We invite you to install and test the new Microsoft Edge to check if your site looks fine with it.

You likely see the difference when you load our website in Microsoft Edge on a Windows 10 PC vs Chrome on an Android smartphone. A feature of web browsers called the user agent string makes this happen.

Select the Emulation tab then click in the User agent string list box. Both Edge and Internet Explorer support a variety of modes, including Opera, Safari, Firefox, and Chrome.

When selected, the page you are browsing will be refreshed in real time, letting you see how it behaves in that particular web browser. Click in the Custom list box then choose the desired browser mode.

Opera’s Developer Tools are based on Chrome, but accessing it is a bit easier. Unlike Chrome, Opera, Edge, and IE, Firefox doesn’t have a user -friendly way to quickly switch the user agent string.


There are add-ons with similar names, so, look for the version with the globe icon and a network pipe attached. Choose the desktop web browser and operating system platform to view the desired website.

But modifying the user agent string will let you download the ISO image directly if the page detects another platform such as Linux or macOS. But for site owners and developers, it is necessary to know the user agent names for the following reasons.

By analyzing these log entries, you can find out how many automated crawlers are scanning your site. For example, Google uses Google bot user agent to crawl websites for showing them in desktop search results.

User Agents List for Google, Bing, Baidu and Yandex Search Engines Here is list of user agents for the popular search engines. For example, if you don’t want Yandex search engine to crawl your site then add the following entries in your Robots.txt file.

For example, you can instruct the server to block known bad bots by adding the below entries. User-Agent test and override registry scripts Erica built this page long ago; it's now used as a quick place to poke interesting Web Browser APIs.


Otherwise, run one of the following scripts and restart all browser instances to see the change : The following script commands will generate a text file containing all UA-override registry settings.

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