Calculator
What the User Agent Checker does
User Agent Checker: checks Browser from User-agent string (blank = your browser). Example: user-agent string (blank = your browser) (empty) gives browser Unknown.
Feed it User-agent string (blank = your browser); it hands back Browser. Adjust anything and the figures re-derive on the spot.
Most people who open the User Agent Checker are people checking a code or identifier. Some jobs are too small to justify installing anything.
The page holds your values in memory and forgets them the moment you close it.
Below the tool you will find the field reference, the method, and an example computed from the values it opens with.
What do the User Agent Checker fields mean?
The User Agent Checker uses 1 input. The page opens in a usable state: real values in, real answer out, ready to edit.
| Field | What to enter | Default |
|---|---|---|
| User-agent string (blank = your browser) | paste or type any amount of text | none |
How does the User Agent Checker work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same check.
An empty or malformed field stops the calculation rather than being treated as zero.
Worked example
These are the values the User Agent Checker loads by default, and the result it produces from them. Below is the same computation the tool performs on load, step by step.
| User-agent string (blank = your browser) | (empty) |
|---|
| Browser | Unknown |
|---|
How to use it
- Paste your content into User-agent string (blank = your browser).
- The answer follows your cursor, in effect. Change a field and read the new figure.
- Look at Browser in the output panel.
- Copy Link when you want to return to this exact configuration; Print when someone needs it on paper.
What this tool does not do
- Results are informational and should be checked against an authoritative source where it matters.
- Where a standard has revisions, the version used is the one named in the method section.
Frequently asked questions
Just User-agent string (blank = your browser). Every box already holds a working value, so the quickest approach is to replace the one number you actually care about.
With the values loaded when the page opens, browser comes out as Unknown. Adjust any field to see how much the answer depends on it.
Nothing leaves your machine. The only network traffic is loading the page itself.
No charge. Everything on the page is available without signing in.
There is no estimation step. The result is computed, not inferred.