User Agent Parser
Parse user agent strings into components
User Agent Parser is a free online tool from BrowserUtils that parse user agent strings into components. It runs entirely in your browser — your data never leaves your device. No account required.
Your browser's user agent is auto-filled above. Paste any UA string to parse it.
How to use User Agent Parser
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About User Agent Parser
Free online user agent parser. Parse any user agent string to identify the browser, operating system, device type, and rendering engine. Auto-detects your current browser. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
User Agent Parser specs
- Runtime
- 100% client-side (browser)
- Built on
- WHATWG URL API and Headers/Fetch standards as implemented by modern browsers
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is a user agent string?
A user agent string is a text identifier sent by web browsers and other HTTP clients in the User-Agent header. It contains information about the browser name and version, operating system, device type, and rendering engine.
Why are user agent strings so complex?
User agent strings are complex due to historical browser compatibility. Browsers often include identifiers of other browsers to ensure they receive compatible content. For example, most browsers include "Mozilla/5.0" for legacy compatibility reasons.
Can the user agent parser detect mobile vs desktop devices?
Yes, the parser identifies the device type (mobile, tablet, or desktop) based on keywords and patterns in the user agent string, along with the specific device model when available.
Does the user agent parser auto-detect my browser?
Yes, when you open the tool it automatically parses your current browser's user agent string and displays the detected browser, OS, and device. You can also paste any other user agent string to analyze it.
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