User-Agent Generator — Custom UA Strings
Generate realistic User-Agent strings for Chrome, Firefox, Safari, Edge, Opera, and Googlebot on any OS.
How it works
- 1Configure your options above
- 2Click "Generate User-Agent" — processing happens in your browser
- 3Copy or download the result
What to do next
About User-Agent Generator
User-Agent Generator handles a focused step in the modern web and productivity utility workflow. Generate realistic User-Agent strings for Chrome, Firefox, Safari, Edge, Opera, and Googlebot on any OS. The page loads with the upload area, controls and result panel all visible at once, so the path from "I have a file" to "I have the result" is one screen long.
User-Agent Generator is implemented on top of standard browser APIs. Inputs are read from the file picker or drop zone, decoded in the browser, processed, and re-encoded into the output format. Files up to 0 MB are well within the comfort zone of any modern browser.
The execution path is auditable from the page itself: open developer tools, switch to the Network tab, run a job. The requests you see are static-asset GETs for the engine and the page resources. The actual work is JavaScript code running against the bytes already in your tab's memory.
Anyone who works with web and productivity utility on a casual basis — marketers running campaigns, site owners auditing pages, community managers planning posts — finds User-Agent Generator a quick way to get the result. The page loads in under a second, the controls are visible from a single screen, and the result downloads or copies in one click.
Reach for User-Agent Generator when you need a predictable result on a single file. The page works on the first visit, the controls are visible without a menu, and the output is delivered the moment the engine finishes.
A practical note on limits: User-Agent Generator accepts inputs up to 0 MB per run, and the tool processes one input at a time to keep memory usage predictable. If you ever bump into the ceiling, the cause is the size of the input.
User-Agent Generator sits in a small group of related tools. Useful neighbours include Browser Info Detector, Screen Resolution Checker, Browser Feature Detector, and Cookie Analyzer. They are designed to compose: the output of one is a sensible input to the next, so a multi-step task is usually a sequence of single-click operations.
User-Agent Generator keeps the control set focused. Every option on the page is there because a real workflow needs it, and the defaults aim at the most common case so a first-time user can get the right output without changing any settings.
User-Agent Generator returns the result as a download. If you are running multiple jobs, the output names will not collide as long as the input names differ. You can re-run with different settings as many times as you like; each run produces a fresh file with no caching trickery in between.
A short note on how User-Agent Generator came to look the way it does: every iteration started by watching how someone unfamiliar with the tool actually used it, then removing whatever got in their way. That is why the upload area dominates the screen, the run button is bigger than the secondary controls, and the result panel is unmissable when the job finishes.
User-Agent Generator produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
A few practical tips that experienced users of User-Agent Generator pick up over time. First, keep your default browser updated — the engine relies on standard web APIs and newer browser versions are noticeably faster than ones from a few years ago. Second, close other heavy tabs before processing a large input; the engine shares CPU and memory with whatever else is open. Third, if you re-run the same kind of job often, your last-used settings are remembered for the rest of the tab session, so subsequent runs are essentially one click.
For most failure modes, refreshing the page and re-running the job is enough — the engine has no persistent state to corrupt. If the same input fails twice in a row, the input itself is most likely the problem (a truncated file, an unexpected variant of the format, or a stream the engine does not recognise).
User-Agent Generator is intentionally narrow in scope so the common case is fast and the result is predictable. If you ever need a variation it does not cover, browse the rest of the catalog — there is a good chance an adjacent tool already exists, and switching between tools is just a matter of opening another tab.
How it works
- 1Open the User-Agent Generator workspace above. The interface is a single page, so there is nothing to navigate.
- 2Add your web utility input by dropping it onto the page or browsing for it.
- 3Tweak the controls if the defaults are not quite right for your input. The options are kept short and labelled in plain language.
- 4Trigger processing. standard browser APIs reads your input, applies the transformation, and writes the result back into the page.
- 5Download the result. The file is generated in your browser and saved through your normal download flow.
- 6Run additional jobs as needed. The same controls and defaults apply on every run.
Common use cases
- Sanity-check a webhook response while debugging using User-Agent Generator.
- Create a placeholder image for a wireframe.
- Validate a setting before circulating it to a team.
- Pull a quick reference number for a status update.
- Plan content without paying for a SaaS dashboard.
- Run a fast accessibility check before publishing.
- Compare two product variations side by side.
- Generate a temporary asset for a social post.
- Audit a marketing page before launch.
FAQ
Are these real User-Agents?
They follow the exact format used by real browsers. Version numbers are customizable.
Use cases?
Testing web applications, debugging responsive designs, scraping, and API testing.
Bot User-Agents?
Googlebot is included for testing crawler behavior on your site.
Private?
Yes — generated locally.
Output formats?
Raw string, HTTP header, JavaScript override, and cURL command.
Mobile User-Agents?
Select Android or iOS as the OS to generate mobile browser User-Agent strings.
What does User-Agent Generator do that command-line tools do not?
Desktop apps usually have more advanced features but require installation, maintenance and (often) a licence. Paid online tools are convenient but route your file through their servers and gate downloads behind accounts. User-Agent Generator sits in between: free, instant, and private, but intentionally narrow in scope. For one-off jobs and the common web and productivity utility operations, it is usually the lowest-friction choice; for highly specialised work, a dedicated app is still the right answer.
Does User-Agent Generator work with screen readers?
User-Agent Generator uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.
Do I need to install anything to use User-Agent Generator?
No installation is needed. User-Agent Generator runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use User-Agent Generator on any computer you have temporary access to without leaving anything installed on it.
What input formats are supported by User-Agent Generator?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
Can I use User-Agent Generator for commercial work?
User-Agent Generator can be used for personal and commercial work alike — there is no separate "business" licence to purchase. The output you generate is yours to use however you want, including in client deliverables, internal documents, or commercial products. Favtoo's only ask is fair, individual use; the tool is not designed to be embedded as a backend service or wrapped behind an API for resale.
How fast is User-Agent Generator?
Most jobs finish in seconds. Speed scales with input size and with how many CPU cycles your browser tab has available — the engine runs in your browser, so it shares resources with whatever else you have open. For inputs near the 0 MB ceiling, expect anywhere from a few seconds to roughly a minute on a typical laptop. Closing other heavy tabs noticeably speeds things up.
Can User-Agent Generator run inside a corporate firewall?
User-Agent Generator is a static page running an open-source engine in your browser, so a typical corporate firewall does not get in the way as long as it allows JavaScript to load from Favtoo. For teams that need to host it themselves on an internal network, the underlying engine (standard browser APIs) is open-source and can be packaged into a private build with the same behaviour. Reach out via the Contact page if that is something you are exploring.
Is there a programmatic version of User-Agent Generator?
User-Agent Generator is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.