Why do all modern browsers start with Mozilla/5.0?

This is a legacy compatibility artifact. Early browsers used their own prefixes, but sites began blocking non-Mozilla agents. Later browsers adopted the prefix for compatibility, and it stuck.

Can User-Agent strings be faked?

Yes. Any client can send any User-Agent value. Never rely on it alone for security-critical decisions. It is useful for analytics and diagnostics, not authentication.

Does the tool detect mobile devices accurately?

Yes. It distinguishes iPhone, iPad, Android phones, and Android tablets from Windows and macOS desktops using standard device tokens in the User-Agent.

Which bots are recognized?

Googlebot, Bingbot, major social media crawlers, and common web scraping frameworks are included in the detection database.

Is this a replacement for server-side UA parsing libraries?

It is ideal for development, debugging, and manual inspection. For high-volume production parsing, a server-side library is recommended.

Is a User-Agent string considered personal data under GDPR or similar regulations?

This tool does not constitute legal or professional advice. When combined with an IP address, User-Agent data may qualify as personal data under applicable regulations. Please consult a qualified data protection professional for a definitive assessment.

User-agent parser — Free Online

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Example User-Agents (try with one click)

💡 Usage

Web developer: Server log analysis, traffic source parsing.
QA: Parse the UA from a bug report.
Analytics: A GA/Mixpanel UA-parse alternative.
Bot detection: Separate UAs containing “bot”, “crawler”, “spider” (basic).
Limitation: Spoofed UAs are not detected — a user can change their UA.

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📖 How to Use

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User-Agent Parser

💡 Usage

📖 How to Use