Parse User Agents

Explore User Agents

We have a huge collection of over 69.2 million different types of user agents. Look around to find user agents for whatever browser, operating system, device, software type or layout engine you need. If you need to decode a user agent, use the User Agent Parser or the User Agent Parsing API.

Need to get a copy of all 69.2 million user agents? Download the database of user agents in a variety of formats.

Welcome to The User Agent Knowledgebase

We've been decoding user agents for more than 10 years and we've seen it all - the good, the bad and the downright weird! This website is a collection of resources dedicated to understanding and working with user agents, including the new proposal which may end up eliminating user agents: Client Hints.

As well as this, we've also got resources (such as our Frontend Library) dedicated to detecting frontend web browser features and settings, so that you can understand what technology your website visitors are using and help solve their technical problems. It's the same technology we use on whatismybrowser.com.

You can use our user agent parser form to paste in a user agent and decipher it. If you want to automate sending lots of user agents, then look at our user agent parsing API - not only will it let you easily decode millions of user agents, it will tell you if your visitor's web browsers are up to date or if someone is trying to send you a dangerous or weird user agent. Our API has lots of helpful features and is trusted by thousands of companies - check it out now.