User-Agent Parser
Analyze user-agent strings to identify browsers, operating systems, and search engine bots. Useful for traffic analysis and understanding how search engines crawl your site. Parse complex user-agent headers to determine device types, browser information, and bot identification for SEO analysis and crawler monitoring.
Complete Guide: User-Agent Parser
Everything you need to know about using this tool effectively
The User-Agent Parser breaks down raw user-agent strings into structured fields: browser name and version, operating system, device type, and bot classification. It runs entirely in the browser using pattern matching against known browsers, operating systems, device signatures, and bot identifiers.
A client-side tool that takes a user-agent string and extracts the browser (Chrome, Firefox, Safari, Edge, Opera, Samsung Internet), operating system (Windows, macOS, iOS, Android, Linux), device type (Desktop, Mobile, Tablet), and bot status. It recognizes common search engine bots like Googlebot and Bingbot as well as AI crawlers such as GPTBot and Claude-Web. Preset examples let you load sample user-agent strings for quick testing.
Bot identification
Paste a user-agent from your server logs to determine whether the visitor was a search engine crawler, AI bot, or regular browser.
Log analysis support
Parse user-agent strings extracted from access logs to understand the browser and device mix of your traffic.
Crawler debugging
Test known bot user-agents to verify how your server-side logic or CDN rules would classify them.
Device type verification
Check whether a user-agent string is classified as mobile, tablet, or desktop to troubleshoot responsive serving.
Quick reference
Use the built-in presets to see what standard user-agent strings look like for common browsers and crawlers.
Load a preset
Click one of the preset buttons (Chrome Windows, Safari iPhone, Googlebot, Firefox Android) to populate a sample user-agent string.
Paste your own string
Enter any user-agent string into the text area for analysis.
Parse the input
Click Parse User-Agent to run the analysis and display browser, OS, device type, and bot status.
Review the results
Check the result cards for browser name and version, operating system, device classification, and flag indicators.
Copy or reset
Use the Copy button to export the parsed JSON or click Reset to clear everything and start again.
Paste user-agent strings directly from server access logs to quickly classify unknown visitors.
Use the Googlebot preset to see what fields the parser extracts from a crawler user-agent versus a regular browser.
Check the Bot flag when triaging log entries-bot-classified strings skip browser and OS detection and return the bot name directly.
Compare mobile and desktop user-agents side by side to verify your device-detection logic matches the parser output.
Copy the JSON result into your documentation when you need a structured breakdown of a specific user-agent.
What information does the parser extract from a user-agent string?
It returns the browser name and version, operating system name and version, device type (Desktop, Mobile, or Tablet), and whether the string matches a known bot.
Which bots does it recognize?
Googlebot, Bingbot, Slurp, DuckDuckBot, Baiduspider, YandexBot, facebookexternalhit, Twitterbot, LinkedInBot, GPTBot, Claude-Web, CCBot, ChatGPT-User, and Google-Extended.
Does it detect my current browser automatically?
No. You need to paste a user-agent string or select a preset. The tool does not read your browser's user-agent header on its own.
How accurate is the device type detection?
It uses pattern matching for iPhone, iPad, and Android device signatures. Strings that don't match a specific pattern default to Desktop.
Is the parsing done server-side?
No. All parsing runs in the browser using regex pattern matching. Nothing is sent to a server.