User Agent Generator

Generates user agent strings for developers, testers, and QA teams to simulate traffic from different devices and browsers.

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1,712+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how User Agent Generator processes input data instantly inside your browser.

Sample Input Birth date: Jan 15, 1995, Target date: Oct 20, 2023

Computed Result Chronological Age: 28 Years, 9 Months, 5 Days (10,505 days elapsed)

Execution Mode Client-Side In-Browser JS

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About This Tool

The User Agent Generator creates valid UA strings by combining browser, version, rendering engine, OS, device type, and optional locale tokens. It supports desktop and mobile contexts and mirrors common UA grammars used by servers for parsing. Conceptually, it relies on a template-based approach where users supply or select token values, and the system substitutes them into canonical strings. This yields repeatable results for automated tests and diverse samples for broader coverage. Beneficiaries include frontend developers, QA engineers, and automation teams who require scalable, reproducible UA strings for cross-platform testing, server-side parsing validation, and performance testing. Unique value arises from modular tokens, built-in validation, and CI-friendly exports that can be consumed by test rigs or mock servers. Core features include multi-token input, input validation, deterministic and randomized modes, and options to export or copy the resulting string for downstream workflows.

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How to Use

Provide inputs: browser, browser_version, os, os_version, device, and optional locale.
Choose generation mode: deterministic or random.
Generate: run the tool to assemble the UA string from tokens.
Review outputs: copy the UA string and, if available, the token breakdown.
Validate in your testing environment by inspecting the User-Agent header.

Frequently Asked Questions

Find Quick Answers

What is a user agent string?

A user agent string identifies the client software and device to servers. It encodes details such as browser family and version, rendering engine, operating system, and device type. This tool builds strings that conform to common UA grammars to aid testing and compatibility checks.

Can it generate strings for mobile and desktop?

Yes. By selecting the device type and OS versions, the generator can output mobile UA variants (Android, iOS) as well as desktop UA patterns (Windows, macOS, Linux). It supports tablet and headless contexts as well for broader test coverage.

Can I customize by vendor-specific tokens?

Yes. Advanced options allow adding or overriding tokens such as platform, architecture, or locale to reflect vendor-specific UA quirks. If a token is unknown, the tool will flag it and substitute a safe default to maintain validity.

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