Free online User-Agent string parser. Parse any UA string to identify browser name, version, rendering engine, operating system, device type, CPU architecture, and bot detection. Essential for web analytics, device detection, and debugging user access patterns. 100% browser-based with zero uploads.
100% browser-based — your data never leaves your device
Parse and analyze User-Agent strings to identify browsers, devices, and OS.
Copy a User-Agent string from your browser, server logs, or HTTP headers and paste it into the input field.
The tool automatically displays the browser, version, operating system, and device type.
Click any parsed field to copy it to your clipboard for use in reports or debugging.
Ctrl+Enter to parse
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User-Agent Parser is a free online text tool that parse and analyze user-agent strings to identify browsers, devices, and os. It works entirely in your browser — no downloads, no installations, and no server uploads required. content writers, developers, technical writers use User-Agent Parser when they need a fast, privacy-respecting way to process text data without installing additional software. It supports capabilities such as browser detection, os detection, device info. Additional features include version breakdown. Common use cases include analyzing visitor browser and device data from server access logs, debugging browser-specific rendering issues in web development, identifying bot and crawler traffic from user-agent strings. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes User-Agent Parser ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
User-Agent Parser is a free online text tool that helps you parse and analyze user-agent strings to identify browsers, devices, and os. Key capabilities include browser detection, os detection, device info. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to analyzing visitor browser and device data from server access logs.
Copy a User-Agent string from your browser, server logs, or HTTP headers and paste it into the input field.
The tool automatically displays the browser, version, operating system, and device type.
Click any parsed field to copy it to your clipboard for use in reports or debugging.
| Category | Details |
|---|---|
| Input Limits | Maximum input length: Browser memory bound |
| Encoding support: UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252 | |
| Supported Formats | Plain text, UTF-8, ASCII, Unicode, Percent-encoding (RFC 3986) |
| Browser Engine |
|
All operations run entirely in your browser using built-in Text APIs. No server uploads, no data storage, and no third-party requests.
User-Agent Parser is ideal when you need to analyzing visitor browser and device data from server access logs without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for advanced text manipulation within an IDE, consider using VS Code. For for batch text processing on servers, sed/awk (command-line) may be a better fit. User-Agent Parser fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. User-Agent Parser processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
A User-Agent (UA) string is a text sent by browsers and other HTTP clients to identify themselves to web servers. It typically contains information about the browser, rendering engine, operating system, and device.
Parsing UAs is useful for analytics, browser-specific feature detection, device targeting, debugging HTTP requests, and understanding traffic patterns from server logs.
Identifies Chrome, Firefox, Safari, Edge, Opera, and mobile browsers.
Detects Windows, macOS, Linux, Android, iOS, and other operating systems.
Identifies mobile, tablet, desktop, and bot/crawler user agents.
Shows detailed version numbers for browser, engine, and OS.
User-Agent Parser is useful in a variety of scenarios across different workflows:
Analyzing visitor browser and device data from server access logs
Debugging browser-specific rendering issues in web development
Identifying bot and crawler traffic from user-agent strings
User-Agent strings are sent by the client and can be easily modified. Don't rely on UA parsing alone for security decisions.
Many websites use UA parsing to serve different layouts. Use this tool to verify your site's mobile detection is working correctly.
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