What is a user agent string?

A user agent is a text string that browsers include in every HTTP request to identify themselves. It typically contains the browser name, version, operating system, and rendering engine information.

Why are user agent strings so long and cryptic?

For historical compatibility reasons, browsers include legacy identifiers. Most modern browsers include "Mozilla/5.0" and "like Gecko" even though they are not Mozilla or Gecko-based, because servers used to block unknown browsers.

Can this detect bot traffic?

Yes, the parser checks for common bot indicators like "bot", "crawler", "spider", "slurp", and "fetch" in the user agent string and classifies them as Bot device type.

How accurate is the detection?

The parser uses regex patterns that cover all major browsers and operating systems. Edge cases with unusual or spoofed user agents may not parse correctly.

Can user agents be faked?

Yes, user agents can easily be spoofed using browser extensions or developer tools. Never rely solely on user agent strings for security decisions.

Why does Chrome show version but my browser is Brave?

Brave is built on Chromium and shares the Chrome user agent string. Some versions of Brave include a "Brave" identifier, but not all.

Does it work with server log entries?

Yes, paste any user agent string from your server access logs and the parser will analyze it. This is useful for understanding your site traffic by browser and device.

What is the difference between WebKit and Blink?

WebKit is Apple Safari rendering engine. Blink is Google fork of WebKit, used by Chrome, Edge, Opera, Brave, and other Chromium-based browsers. Both appear as "AppleWebKit" in user agent strings for compatibility.

Security & Network

User Agent Parser

Parse any user agent string to identify browser, OS, device type, and rendering engine. Auto-detects your current browser.

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No sign-up
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Instant results

User Agent String

What this tool does

Auto-detects your browser user agent
Identifies browser name and version
Detects OS, device type, and engine
Parse any custom user agent string
No external APIs or libraries

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The short version

What is User Agent Parser?

A user agent parser analyzes the user agent string that every browser sends with HTTP requests.

It extracts structured information including the browser name and version, operating system and version, device type (desktop, mobile, tablet, or bot), and the rendering engine (Blink, WebKit, Gecko, or Trident). This tool auto-detects your current browser's user agent on page load and lets you paste any custom user agent string for analysis.

Step by step

How to use User Agent Parser

1
Auto-detect or paste
Your browser user agent is auto-detected on load. Click Use my UA to reset, or paste any custom user agent string.
2
Click Parse
Press Parse or Ctrl+Enter to analyze the user agent string.
3
View results
See the browser, OS, device type, and engine in the result cards with a summary line.
4
Copy results
Click Copy to copy the parsed results to your clipboard in a readable format.

What's inside

Everything this tool
does for you

Auto-detects your current browser user agent
Identifies 15+ browsers: Chrome, Firefox, Safari, Edge, Opera, Brave, and more
Detects Windows, macOS, Linux, iOS, Android, and Chrome OS
Classifies device as Desktop, Mobile, Tablet, or Bot
Identifies rendering engine: Blink, WebKit, Gecko, Trident
Clean card-based results with color coding
Copy parsed results to clipboard
No external libraries or API calls needed

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Questions

Frequently asked questions

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What is User Agent Parser?

How to use User Agent Parser

Auto-detect or paste

Click Parse

View results

Copy results

Everything this tooldoes for you

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Frequently asked questions

What is a user agent string?

Why are user agent strings so long and cryptic?

Can this detect bot traffic?

How accurate is the detection?

Can user agents be faked?

Why does Chrome show version but my browser is Brave?

Does it work with server log entries?

What is the difference between WebKit and Blink?

This tool fixed one thing.Now fix the whole site.

Everything this tool
does for you

This tool fixed one thing.
Now fix the whole site.