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Generate User Agent Strings for Any Browser User Agent Generator tool for network operations.

User Agent Generator illustration
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User Agent Generator

User Agent Generator tool for network operations.

1

Select User Agent Parameters

Choose the browser type, operating system, and device category for your user agent string.

2

Generate the User Agent String

Click Generate to create a user agent string matching your selected parameters.

3

Copy the Generated String

Copy the user agent string to your clipboard for use in development or testing.

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What Is User Agent Generator?

A User Agent Generator is a tool that creates custom user agent strings, mimicking various browsers and devices, allowing users to test and debug their applications under different conditions. Network engineers and developers use it to simulate requests from different browsers and platforms, such as Chrome on Windows or Safari on iPhone, solving the problem of testing browser-specific issues without having multiple devices or setups.

It solves a specific problem where developers need to generate a fake user agent for testing purposes, but require more control over the output than a random user agent string generator would provide. The tool is different because it provides a list of predefined templates for popular browsers and versions, including Edge, Firefox, and Chrome, as well as options like Googlebot and curl, making it a reliable browser user agent string list.

Its custom user agent creator feature allows users to select a specific browser version, such as Chrome 125 or Firefox 120, and generate the corresponding user agent string, which can then be copied to the clipboard for use in testing or development environments, effectively acting as a user agent spoofer tool. The tool's interface is designed to be mobile-friendly and easy to use, providing instant results with no server-side processing required, making it a useful asset for learning how to generate user agent strings.

Why Use User Agent Generator?

  • Instant results
  • 100% client-side
  • Mobile-friendly
  • No signup required

Common Use Cases

Development

Debug browser-specific rendering issues by testing pages with different user agent strings.

Networking

Configure proxy servers and network tools with custom user agent identifiers.

Education

Study how user agent strings identify browsers and devices to web servers.

Security

Test application responses to spoofed user agent strings during security audits.

Technical Guide

The tool works by utilizing a combination of client-side JavaScript and React to manage its state and generate user agent strings. It employs an object called `templates` that stores predefined user agent string templates for various browsers and devices, including Chrome, Firefox, Safari, Edge, Googlebot, and curl. Each template is associated with a specific browser and version, allowing users to select from a list of options using the `SelectWithHelp` component. When a selection is made, the tool uses the `useState` hook to update its state with the chosen browser and version.

The `handleGenerate` function is triggered when the user clicks the "Generate" button, which replaces the `{ver}` placeholder in the selected template with the chosen version using the `replace()` method. The resulting user agent string is then stored in the component's state using the `setGenerated` function. The tool also uses the `copyToClipboard` function from the `@/lib/utils` module to copy the generated user agent string to the clipboard when the "Copy" button is clicked.

The tool's interface is built using React components and utilizes ES6+ features such as arrow functions, destructuring, and async/await syntax. The `useMemo` hook is used to memoize the `browserOptions` and `versionOptions` arrays, ensuring that they are only recalculated when necessary. The tool's mobile-first responsive layout is achieved using CSS classes and a grid-based layout system.

The `versions` object stores an array of available versions for each browser, which is used to populate the version selection dropdown. When the user selects a new browser, the tool updates the available versions by finding the corresponding key in the `versions` object and retrieving the associated array of versions. This ensures that only valid version options are displayed for the selected browser.

The tool's use of React hooks such as `useState`, `useCallback`, and `useMemo` allows it to efficiently manage its state and side effects, making it a reliable and performant solution for generating custom user agent strings. By following UA string standards and RFCs, the tool ensures that the generated user agent strings are valid and consistent with industry conventions.

Tips & Best Practices

  • 1
    All generation runs in your browser, so no user agent data is sent to external servers
  • 2
    Generated strings update instantly as you change parameters
  • 3
    Use the one-click copy button to transfer the generated string to your clipboard
  • 4
    Related tools

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Frequently Asked Questions

Q Is the user agent generator free to use?
Yes, it is completely free with no usage limits.
Q Is it safe to generate user agent strings with this tool?
Yes, all processing runs in your browser with no data sent to any server.
Q Does the user agent generator work on mobile devices?
Yes, the interface is fully responsive on phones and tablets.
Q Can I use the user agent generator offline?
The page needs an initial load, but generation then works locally without further network requests.
Q What browsers support the user agent generator?
All modern browsers are supported, including Chrome, Firefox, Safari, and Edge.

About This Tool

User Agent Generator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.