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Random User Agent Generator

Generate realistic random browser user agent strings for testing, development, and web scraping.

tuneGenerator Options

5
120
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No user agents generated yet

Configure your options, then click Generate User Agents.
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About Random User Agent Generator

A user agent string is the short text a browser sends in every HTTP request to tell the server which browser, rendering engine, operating system, and device it is running on. The Random User Agent Generator produces syntactically correct, realistic user agent strings assembled from real version numbers, real OS identifiers, and the exact token formats used by Chrome, Firefox, Safari, Edge, Opera, Internet Explorer, and a dozen well-known web crawlers. You can filter by browser family, operating system, and device category — desktop, mobile, tablet, or bot — and generate up to 20 strings at once.

The tool is designed for situations where you need browser diversity without access to a device lab: cross-browser QA scripts that cycle through different UA headers, HTTP client configurations for web scraping, middleware unit tests that branch on the User-Agent header, or security testing where you want to verify that a WAF or rate limiter does not treat certain browsers differently. The built-in "Your Current User Agent" panel also parses your own browser string live so you can compare generated output against a known-good reference.

All generation happens entirely in your browser using JavaScript. No strings are sent to any server, no account is required, and there are no usage limits. The tool also displays and parses your own browser's live user agent string so you can compare generated output to a real-world reference — without any data leaving your machine.

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Key Features

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Six browser families

Generate strings for Chrome, Firefox, Safari, Edge, Opera, and Internet Explorer, each with correct token order, rendering engine identifiers, and version number ranges drawn from real release histories.

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Five operating systems

Windows (NT 6.1 through 10.0), macOS (10.14 through 14), Linux (x86_64 and aarch64), Android (10–14 with real device model strings), and iOS (15–17 on both iPhone and iPad).

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Bot and crawler strings

Toggle on 12 real crawler user agents — Googlebot desktop and mobile, Bingbot, DuckDuckBot, Baiduspider, YandexBot, AhrefsBot, facebookexternalhit, Twitterbot, Applebot, and more — for testing how your server responds to search engine crawlers.

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Older version toggle

Switch between modern-only version numbers and a broader pool that includes older releases, useful when you need to test legacy browser handling or reproduce a reported bug from a user on an older browser.

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Live UA inspector

The page reads your own browser's navigator.userAgent at load time, parses it, and displays your browser name, OS, and device type alongside the generated strings — no manual lookup needed.

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Bulk copy with one click

Copy all generated strings as a newline-delimited list with a single button, or copy any individual string. The output textarea is also editable for any last-minute adjustments.

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How to Use

01

Configure Filters

Select which browsers, operating systems, and device types you want to include in the generated user agents.

02

Set Count & Generate

Choose how many user agents you need using the slider, then click Generate to create them.

03

Copy & Use

Copy individual user agents or use Copy All to grab the entire set for your testing or development needs.

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Example

Selecting Chrome, Firefox, and Edge on Windows and macOS desktop, with older versions disabled, produces syntactically valid strings like these.

Settings chosen
Browsers: Chrome, Firefox, Edge
OS: Windows, macOS
Device: Desktop
Include older versions: No
Count: 3
Generated user agents (sample)
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.4567.83 Safari/537.36
Mozilla/5.0 (Macintosh; Intel Mac OS X 13_4; rv:118.0) Gecko/20100101 Firefox/118.0
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.3891.102 Safari/537.36 Edg/115.0.1045.41
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Common Use Cases

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    Cross-browser QA without a device lab

    Feed a list of generated user agents into your Playwright or Puppeteer test suite to override the User-Agent header on each run, covering Chrome on Windows, Safari on iOS, and Firefox on Linux without maintaining multiple machines. This is the specific scenario the sibling random-string-generator or random-ip-generator cannot address — those produce opaque tokens, not structured browser identity strings.

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    Web scraping and HTTP client configuration

    Rotate user agents across requests in a Python requests session or a Node.js fetch loop to distribute traffic across different browser fingerprints. The generated strings follow the exact format servers expect, including the correct AppleWebKit version, Gecko revision, or Trident token for each browser family.

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    Testing server-side User-Agent logic

    Verify middleware, analytics pipelines, or feature-flag logic that branches on the User-Agent header. Generate a mobile Safari string, a Googlebot string, and an IE 11 string, then paste each into a curl -H "User-Agent: ..." call to confirm your server handles all three correctly.

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    SEO and crawler simulation

    Use the bot UA strings — Googlebot, Bingbot, AhrefsBot — to check that your server returns the same HTML to crawlers as it does to real browsers, catching accidental cloaking before it affects your search rankings. No other sibling tool in this category generates structured crawler identifiers.

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    Security and WAF testing

    Check whether your web application firewall, rate limiter, or bot-detection layer treats different browsers differently. Generate desktop, mobile, and bot strings and replay them against staging to confirm rules apply uniformly and do not inadvertently block legitimate mobile traffic.

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Frequently Asked Questions

What is a user agent string? expand_more
A user agent string is the text a browser sends in the HTTP User-Agent request header to identify itself to a web server. It encodes the browser name and version, the rendering engine, the operating system, and sometimes the device model. Servers use this information for analytics, content negotiation, and feature detection.
Are the generated user agents realistic? expand_more
Yes. The tool assembles strings using real version numbers from each browser's public release history, real OS platform tokens (such as "Windows NT 10.0; Win64; x64" or "Macintosh; Intel Mac OS X 14_2"), and the exact token order each browser family uses. They are not random character strings — they are structurally identical to strings that real browsers send.
How is this different from the Random String Generator? expand_more
The Random String Generator produces arbitrary alphanumeric or symbol sequences with no internal structure. This tool produces user agent strings that conform to the specific grammar browsers and crawlers use — correct rendering engine tokens, version number formats, and OS platform identifiers. You cannot substitute a random string where a valid user agent is expected.
Can I generate bot user agent strings? expand_more
Yes. Enable "Include Bot User Agents" and select the Bot/Crawler device type to include strings for Googlebot (desktop and mobile), Bingbot, DuckDuckBot, Baiduspider, YandexBot, AhrefsBot, facebookexternalhit, Twitterbot, and Applebot — all taken from the real strings those services publish.
What does the older versions toggle do? expand_more
When enabled, the generator adds older browser version numbers (for example Chrome 70–99 alongside Chrome 100–125) to the pool it draws from. This lets you simulate traffic from users who have not updated their browser, which is useful for reproducing legacy-browser bug reports or testing backward-compatible feature flags.
Is my data secure? expand_more
All generation runs in your browser using JavaScript. Nothing is uploaded or logged. The "Your Current User Agent" panel reads navigator.userAgent from your own browser locally — it does not send that string anywhere.
How many user agents can I generate at once? expand_more
The slider allows 1 to 20 strings per generation. There is no rate limit or daily cap; you can click Generate as many times as you like. If you need more than 20 at once, click Generate multiple times and use Copy All each time.
Why do some filter combinations produce fewer results than expected? expand_more
Not every browser runs on every OS. Safari only runs on macOS and iOS; Internet Explorer only runs on Windows; Chrome, Firefox, and Edge do not appear on iOS in the same way. If you pick a narrow filter — such as Safari on Linux — the tool finds no valid combinations and shows an error, which prevents it from generating malformed strings.