What is replacing User-Agent strings?

Modern browsers are transitioning towards User-Agent Client Hints (UA-CH) to reduce passive fingerprinting while providing structured client data.

Updated: August 2026 • Verified v1.2

User Agent Parser & Checker

Internet & NetworkEssential

View, parse, and analyze your current User-Agent string or test custom User-Agent strings to inspect device, browser, and OS tokens.

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

Regex Token Parsing: Mozilla/5.0 ([Platform]; [OS]) AppleWebKit/[WebKit_Ver] Chrome/[Chrome_Ver] Safari/[Safari_Ver]

Understanding Your Results

Identifies the client software family and platform architecture. Shows whether the request originates from a Mobile, Tablet, or Desktop environment.

Practical Guidance & Next Steps

Paste User-Agent strings from Apache/Nginx web server access logs to identify client device types or detect search crawler bots (Googlebot, Bingbot).

What is this?

A parser that takes raw HTTP User-Agent strings and breaks them down into structured data tokens (Browser, Major Version, OS, Platform, Rendering Engine).

How does it work?

Inspects `navigator.userAgent` or allows you to paste any raw UA string from server access logs to parse its exact identity.

Why use it?

Useful for debugging server routing rules, checking bot crawlers (Googlebot / Bingbot), verifying mobile emulation in developer tools, and understanding Client Hints.

Technical Scope & Calculation Limitations

Modern Chromium browsers freeze User-Agent strings to prevent device fingerprinting and rely on User-Agent Client Hints (UA-CH).

Frequently Asked Questions

This is historical legacy. In the early days of the web, Netscape (Mozilla) had advanced features, so competing browsers included 'Mozilla' to avoid being blocked by web servers.

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