User Agent Builder
Compose browser User-Agent tokens from platform, engine, and version presets for testing.
Compose User-Agent strings for integration tests
Servers, CDNs, and feature flags often branch on the HTTP User-Agent header. QA engineers need
realistic desktop and mobile tokens without copying stale strings from blog posts. This builder stitches
common platform, engine, and browser version segments into a full header value you can paste into curl,
Playwright, or API clients.
Not a fingerprinting service
The output follows widely seen patterns (Chrome on Windows, Safari on iPhone, Firefox on Linux, and similar). It does not query your device. For decoding an existing header, use the User Agent Parser or generate random samples with the Random User Agent Generator.
Frequently Asked Questions
Will every site accept these strings?
Some anti-bot systems block synthetic or outdated tokens. Treat the output as a starting point and adjust version numbers to match your test matrix.
Can I emulate mobile Safari?
Choose the iPhone platform preset and WebKit engine with the Safari browser family. Toggle mobile device class when you need a compact layout hint in your test harness.
Where is the string sent?
Nowhere. Composition runs locally in your browser; copy the result into your own HTTP client.
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