User Agent Generator

How to use

1. 1Keep Build one selected, then choose a platform such as Windows, macOS, Android, or iPhone.
2. 2Pick a browser from the ones that ship on that platform (Chrome, Firefox, Safari, Edge, or Opera).
3. 3Read the generated User-Agent string and the note that explains its structure, then use New version to reroll the version and device or Randomize for a random coherent combination.
4. 4Copy the string, the full User-Agent header line, or one of the curl, fetch, Python, or Node snippets with the matching Copy button.
5. 5Switch to Generate a list, set a count from 1 to 200, and use Copy all to grab a batch of varied strings. Everything runs in your browser.

About this tool

User Agent Generator builds a realistic HTTP User-Agent request header string for the browser and device you choose, the exact reverse of what the User Agent Parser does. Pick a platform (Windows, macOS, Linux, Android phone, iPhone, or iPad) and a browser (Chrome, Firefox, Safari, Edge, or Opera), and the tool assembles a string a real server would accept, using the rigid templates each browser follows. That matters because User-Agent strings are full of legacy quirks: almost every browser still begins with Mozilla/5.0, Chromium browsers carry an AppleWebKit/537.36 (KHTML, like Gecko) token and a trailing Safari/537.36 even though they use the Blink engine, Edge appends an Edg marker, Opera appends OPR, and on iOS every browser is required to use Apple's WebKit engine, so Chrome shows CriOS and Firefox shows FxiOS rather than their desktop engine. Hand-writing these by memory is error-prone, so this tool keeps the structure correct for you. Each platform only offers the browsers that actually ship on it, mobile strings embed a believable device model such as Pixel 8 or a Galaxy model token, and the version numbers come from current-era pools so nothing looks impossibly old or invented. A New version button rerolls the version and device while keeping your platform and browser, a Randomize button picks a coherent platform and browser pair at random, and a plain-language note explains why the chosen string looks the way it does. Switch to the list mode to generate up to 200 varied, valid User-Agent strings at once across a random mix of desktop and mobile clients, which is handy for test fixtures, seed data, request rotation, or building an allow or deny list. Copy-ready snippets wire the generated string into curl, JavaScript fetch, Python requests, Node, and a raw request header so you can paste it straight into a client. A User-Agent is a hint and not proof of identity, since any client can send any value, and real version numbers change with every browser release, so verify against live traffic for critical filtering. Everything runs entirely in your browser: the strings you generate are never uploaded, there is no signup, and there is no tracking. It pairs naturally with the User Agent Parser to confirm a string classifies the way you expect, and with the HTTP Headers Parser and Accept-Language tools for the rest of a request.

Free to use. Works in your browser. No signup, no login.