Browser Checker
What browser you are using, which version, which engine and which system — read from the line your browser announces.
Results
What this tool does
Every browser introduces itself to every website with a single line of text called the user agent, and that line is a small museum of thirty years of browsers pretending to be each other. This page fills it in with your own and pulls out what it actually means. You can also paste someone else's line — from a log file, a bug report, an analytics export — and read it the same way.
Formula
reads the user agent line and looks, from the most specific to the most general, for the browser brand, the engine and the system
Variables
| Symbol | Meaning | Unit |
|---|---|---|
ua | User agent | — |
OUT | Browser | — |
BV | Version | — |
EN | Engine | — |
OS | System | — |
MB | Phone or tablet | — |
LN | Length of the line | — |
Worked example
- User agentMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36
- BrowserChrome 140
- Version140
- EngineWebKit/Blink
- SystemWindows 10/11
- Phone or tabletNo
- Length of the line111
Limitations
- The calculation runs entirely in your browser. The values you type are never sent to a server.
Frequently asked questions
Why does the line say Mozilla, Safari and Chrome all at once?
Because for thirty years browsers have copied each other's names to get past websites that only served pages to the browser they recognised. Every one of them still begins with Mozilla, Chrome still claims to be Safari, and Edge claims to be Chrome. Reading the line means looking for the most specific name first and stopping there, which is what this page does.
Why does Safari report a different number from the one in the line?
Because Safari puts its own version after the word Version and leaves a build number of its rendering engine after the word Safari. Reading the wrong one turns a current iPhone into Safari 604. This page takes the number after Version when it is there, which is the one Apple means.