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Random User Agent Generator

Create synthetic User-Agent strings that mimic real browsers and devices. Choose platform (desktop/mobile) and browser (Chrome/Firefox/Safari) to generate authentic-looking UA headers for testing HTTP clients and web scrapers.

Also known as: ua string · browser string · http header

seeded · synthetic data

Presets

Output

No output yet — set your options and hit .
About this tool, tips & examples

What it does

The Random User Agent Generator produces synthetic User-Agent strings shaped like real browsers and devices — Chrome, Firefox, and Safari across desktop and mobile (Android, iOS). Filter by platform and browser, generate up to 1,000 per run, and reuse a seed for stable fixtures. The strings parse correctly in UA-parsing libraries without identifying any real client.

Common use cases

  • UA parser testing — browser/OS/device detection code fed realistic variety (presets for mixed, Chrome desktop, and mobile sets).
  • Analytics fixtures — user-agent columns for log and dashboard test data.
  • HTTP client tests — request fixtures with plausible headers for middleware and logging.
  • Responsive-logic testing — server-side device detection exercised across desktop and mobile signatures.

Settings

  • Platform — desktop, mobile, or mixed.
  • Browser — Chrome, Firefox, Safari, or mixed.
  • How many — 1 to 1,000 strings, exportable as text, CSV, or JSON.
  • Seed — identical seed + settings = identical strings.

Privacy note

Strings are generated locally in your browser and never uploaded. They are synthetic — assembled from real UA patterns but identifying no actual device or person, which makes them safe in logs and shared fixtures.

FAQ

Will UA parsers understand these? Yes — they follow the structure of genuine UA strings, so libraries extract sensible browser/OS/device values. That’s the point: realistic input without sampling real traffic.

Why is the User-Agent string so weird anyway? Decades of compatibility lies — everyone claims to be Mozilla, WebKit strings appear everywhere. Parsers must handle this mess, which is why varied test input matters.

A note on scraping: Rotating user agents to evade a site’s controls violates most terms of service. These fixtures are for testing your own systems and parsers.