User-Agent Parser

Parse a User-Agent string to identify the browser, operating system, device type, and rendering engine.

User-Agent String

Paste a User-Agent string above, or use your own browser's string, to see the parsed result.

What Is a User-Agent? Understanding Your Browser's Digital Business Card

A User-Agent (UA) string is a text-based identifier that a web browser sends to a server every time it visits a website. It's like a "handshake" in the digital world, telling the server which browser software you're using, what operating system you're on, which rendering engine powers your browser, and what kind of device you're currently using. Web servers use this information to deliver the best possible experience — serving a mobile-optimized layout to smartphone users and a desktop view to users on high-resolution monitors, for example.

UA strings follow a general structure, but they're mixed with historical relics like "Mozilla/5.0," making them extremely difficult for a human to read and understand directly. DevTora's User-Agent Parser breaks down these cryptic strings into clean information anyone can understand. It identifies platforms like macOS, Windows, Android, and iOS, browser types such as Chrome, Safari, and Firefox along with their exact versions, and even the rendering engine behind them, like WebKit or Blink. Use this tool whenever you're testing browser compatibility during web development, analyzing traffic logs, or simply curious how your own browser identifies itself.

How to Analyze and Make the Most of a User-Agent String

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    Automatic environment detection: When you open the page, your current browser's User-Agent is automatically entered and analyzed.

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    Manual data entry: If you want to inspect information from another device or browser, paste that string directly into the input field.

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    Real-time information updates: As soon as you type or edit the text, the analysis grid above updates its results in real time.

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    Identify the operating system: Check the "OS" card to see the exact platform and version, such as Windows 11 or macOS Monterey.

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    Verify the browser version: Precisely check the browser's name and build number in the "Browser" card.

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    Confirm the device category: Use the "Device" section to determine whether the identifier belongs to a desktop, mobile, or tablet.

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    Analyze the rendering engine: Check the "Engine" card to see the core technology (Blink, Gecko, and so on) that paints the web page to the screen.

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    Test compatibility: Enter the UA of an older browser to simulate how a site would respond to it.

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    Reset to your current environment: Click the "Check My Browser" button anytime to revert back to the information for your currently connected device.

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    Thorough privacy protection: Every analysis runs locally, and your browser information or input is never stored on a server.

Professional-Grade Core Features for Precise Environment Analysis

  • A fully real-time parsing engine: Analysis results update instantly as you edit the input field, for maximum efficiency.
  • One-click "my browser" detection: A feature that lets you check your current connection environment in a single click, no manual entry required.
  • Broad OS recognition: Identifies nearly every operating system, including Windows, macOS, Linux, iOS, Android, and ChromeOS.
  • Precise browser version detection: Built with dedicated logic for major browsers like Chrome, Firefox, Safari, Edge, Opera, and Brave.
  • High-resolution device mapping: Accurately categorizes hardware as desktop, mobile, tablet, smart TV, and more.
  • A polished, fuchsia-themed UI: A modern design that maximizes readability, letting you grasp information at a glance.
  • 100% client-side computation: Data is never transmitted to an external server, fully protecting your privacy and security.
  • Support for legacy strings: Accurately parses even very old-format User-Agent strings for compatibility debugging.
  • Visual platform icons: Provides icons matched to each platform — Apple, Windows, Chrome, and more — to boost at-a-glance clarity.
  • Rendering engine insights: Extracts the engine information at the heart of the web, such as Blink, WebKit, Gecko, or Trident.
  • A responsive, dynamic layout: A mobile-first design that makes checking environment information easy on any device.
  • Ultra-fast engine performance: Analyzes even extremely long or unusual strings in a matter of milliseconds, with zero lag.

Common Misconceptions and Cautions About User-Agent Data

UA Spoofing

A browser can misrepresent its own identity. Don't rely solely on UA analysis for critical functionality — always pair it with feature detection.

The Historical Relic (Mozilla/5.0)

Nearly every UA string starts with "Mozilla/5.0." This is purely a historical artifact left over from passing early web compatibility filters.

Identifying Search Engine Bots

Crawlers like Googlebot or Bingbot carry a distinctive UA. This tool lets you analyze and distinguish bots from real human visitors.

Privacy Protection Policies

Modern browsers (like Brave and Safari) sometimes deliberately simplify UA information to prevent "browser fingerprinting."

The Shift Toward Client Hints

The industry is gradually moving toward a new standard called "User-Agent Client Hints." The amount of information in the UA string is expected to keep shrinking.

Inaccurate OS Versions

To prevent user tracking, some platforms report a generic version instead of a specific one (e.g., displaying 10_15_7 for every version of macOS).

Mastering Browser Identification: Frequently Asked Questions

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    Is it safe to share my User-Agent externally?

    In general, yes — it's just technical information. However, a malicious site could use it for user tracking, so try to only share it with trusted sources.

  2. 2

    I use Chrome — why does my UA contain "Safari"?

    It's for compatibility. Many older websites were designed to only work in Safari, so nearly every browser began including the keyword to pretend to be Safari.

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    What is a rendering engine?

    It's the software that interprets a web page's HTML and CSS and actually paints it onto the screen. Chrome uses Blink, while Safari uses WebKit.

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    Can I change my own User-Agent?

    Yes. You can switch to another device's or browser's UA for testing purposes in the "Network conditions" settings of Chrome DevTools.

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    Does this tool store my browsing history?

    No. DevTora puts privacy first. Every parsing operation happens entirely within your browser and is never logged to a server.

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    What is browser fingerprinting?

    It's a tracking technique that combines browser info, screen size, fonts, and more to uniquely identify a user, even without cookies.

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    When is it useful to check UA information?

    It's helpful when a specific site isn't loading correctly, or when a developer needs to verify that a device-specific responsive layout is working as intended.

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    Why does my OS version show up as "Unknown"?

    For a newly released OS version or a less widely known Linux distribution, it may not yet be registered in the parser library's dictionary.

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    Why does the data start with "Mozilla/5.0"?

    It's for historical reasons. Early web services only allowed access to the Netscape (Mozilla) browser, so other browsers started including the phrase as a convention to get past the filter.

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    Can this tell whether someone is using a VPN?

    No. A User-Agent only describes software and device specifications — it contains no network location or IP information.

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    Does this detect in-app browsers (WebViews) on mobile?

    Yes. Browsers opened inside apps like Facebook or Instagram include distinctive keywords in their UA that make them identifiable.

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    Can UA information be trusted for security purposes?

    No. Since UA information can be easily forged by the user, it's not recommended as sole evidence for authentication or security decisions.

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    Why is my tablet PC identified as "Mobile"?

    Some smaller tablets use the same OS string as mobile devices. This tool tries to distinguish them as much as possible using manufacturer markers.

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    What is a headless browser?

    It's a browser, like Puppeteer, that runs without a GUI for macros or testing purposes. Its UA typically includes a phrase like "HeadlessChrome."

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    Does this tool work on mobile browsers?

    Yes — when you access it from a smartphone, you can clearly see exactly how your phone introduces itself on the internet.

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    Why have UA strings been getting shorter recently?

    Browser makers like Google are running a "UA reduction" campaign that limits excessive information disclosure to make user tracking harder.