User Agent Parser
Inspect user agent headers offline to identify browser details, OS version, device type, and rendering engines instantly.
What is a User Agent (UA) String?
A User Agent string is a line of text sent by web browsers to hosting servers in the HTTP headers of every request. This string serves as an identification card, telling the web server what software application, operating system, rendering engine, and device type is requesting the content.
Websites use this metadata to optimize page layouts (such as delivering a mobile-friendly site to smartphones) or block unsupported browser platforms.
Why Parse User Agents Client-Side?
UA strings have become notoriously convoluted over the years. Most modern browsers include terms like `Mozilla/5.0`, `Safari/537.36`, and `AppleWebKit/537.36` in their strings to maintain backward compatibility with legacy servers. This makes extracting the browser name, version, and device type difficult without parser algorithms.
This **User Agent Parser** runs offline using browser V8 scripts. It uses a collection of regex libraries to extract core components from any UA string without transferring identifiers or device details across networks.
Frequently Asked Questions
A User Agent string is a header sent by your browser to web servers on every request. It contains information about your browser name and version, your operating system, rendering engines, and sometimes the device model.
The tool parses the UA string using comprehensive client-side regular expression matchers inside the browser. It extracts components like Chrome, Safari, iOS, or Android without sending request payloads to external APIs.
No. The parsing code runs in-memory in your browser. We do not log IP addresses, user agents, or device details, guaranteeing 100% security.