What is a user agent string?

A user agent string is a text string that a web browser sends to a website to identify itself and its capabilities. It includes information about the browser name, version, the operating system, the device type, and often the rendering engine. It's essential for web analytics, content negotiation, and bot detection.

Is my user agent data secure when using this parser?

Yes, 100% secure. This tool runs entirely in your browser using client-side JavaScript. The user agent string you paste is never sent to our servers, stored in databases, or logged anywhere.

Can I parse a user agent string from an older browser?

Yes, the tool supports parsing user agent strings from legacy browsers such as Internet Explorer 11, older versions of Chrome and Firefox, and even niche or discontinued browsers. The library used is updated regularly.

Does this tool detect bots and crawlers?

Yes. The parser can identify user agent strings belonging to common search engine bots (Googlebot, Bingbot, Applebot, YandexBot) and many other crawlers, making it useful for testing `robots.txt` and server logs.

What is the difference between user agent parsing and client hints?

User agent parsing interprets the UA string provided by the browser, which can be accurate but is sometimes intentionally spoofed for privacy. Client Hints (like `Sec-CH-UA`) are a newer, more reliable HTTP header system that sends structured browser and device data. Our tool parses the UA string only.

What are the limitations of this free user agent parser?

The tool is completely free with no usage limits. It parses standard user agent strings and can identify most common browsers, OS versions, and device types. For extremely obscure or custom UA strings, the results may be less accurate.

Free User Agent Parser — Analyze Any UA String Instantly

Paste any user agent string and instantly identify thebrowser, operating system, device, and rendering engine. All processing runs locally in your browser with 100% privacy — no data is ever uploaded.

Quick Answer

How do I parse a user agent string for free?

Paste the user agent string into the input field and click 'Parse'. The tool will instantly decode the browser, OS, device, and engine. All processing is client-side and private.

Developer Utility

Free User Agent Parser

Instantly decode messy User Agent strings to identify the web browser, operating system, rendering engine, and device type.

1. User Agent String

Raw Text String

2. Parsed Analytics

Enter a raw user agent string on the left to extract its analytics here.

Why user agent strings look like contradictions

A modern Chrome user agent looks like: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36. It claims to be Mozilla, Apple WebKit, and Safari — even though it's Chrome. This is historical: early browsers added "Mozilla/5.0" because web servers used that prefix to identify capable browsers. Every subsequent browser copied it to avoid being served degraded content. The pattern compounded over decades. Firefox says "Gecko". Chrome says "AppleWebKit" and "Safari". Edge says "Chrome" and "Safari".

What you can and can't reliably detect

Reasonably reliableMobile vs. desktop (look for "Mobile" token), OS family (Windows / Mac / Linux / Android / iOS), rendering engine (Gecko vs. WebKit vs. Blink). These change slowly and are present in most real browsers.
UnreliableExact browser version (easily spoofed), bot detection (good bots identify themselves; bad bots fake Chrome), exact device model on Android (fragmented across manufacturers).
Better alternativeFor feature detection, use navigator.userAgentData (User-Agent Client Hints, available in Chrome/Edge). For feature support, use CSS.supports() or if ('fetch' in window) — test the capability, not the browser identity.

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Why user agent strings look like contradictions

What you can and can't reliably detect

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