01
Keyboard Test
Test keyboard keys, inspect repeated inputs and review a local test summary. Get clear…
Function Key Test
Tests the F1 to F12 row and shows which keys your browser intercepts before the page can see them.
Device Tests
Nothing uploaded
No sign-up
Free, unlimited
The test starts automatically — follow the prompts above.
In short
Function Key Test is a free online tool on inputtesthub.com that tests the F1 to F12 row and shows which keys your browser intercepts before the page can see them. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Function Key Test
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Function Key Test
The Function Key Test tests the F1 to F12 row and shows which keys your browser intercepts before the page can see them. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking whether the function row needs the Fn key held down.
- Confirming F-keys still work after a firmware update.
Many laptops ship with the function row set to media controls by default, so F1 to F12 only reach the browser while Fn is held. There is usually a firmware setting to reverse this.
Frequently asked questions
F11 and F12 do nothing here. Is that a fault?
No. F11 toggles fullscreen and F12 opens developer tools — the browser acts on both before the page sees them. Every other key in the row should register normally.
Why does a key light up in the wrong place?
The test reads the physical key position, not the printed letter, so a non-QWERTY layout will light the key that sits in that position on a US keyboard. That is correct behaviour — it means the test works the same on AZERTY, QWERTZ and Dvorak.
Some keys do nothing at all. Is my keyboard broken?
Not necessarily. Browsers keep a few combinations for themselves — F11, F12, Ctrl+W, Ctrl+T, Cmd+Q, Alt+Tab and the Windows key among them — and act on those instead of passing them to the page. Media keys, Fn-layer keys and macro keys usually never reach the browser either.
Is anything I type recorded?
No. The test runs entirely in your browser tab, keeps only which keys were pressed, and forgets even that when you close or reload the page. Nothing is sent to a server.
Is there a limit on how often I can use the Function Key Test?
It is free, with no account, no trial and no daily cap. Every device tests tool on inputtesthub.com works the same way: open the page and use it.
Does anything I enter leave my computer?
No. The Function Key Test runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What do people use the Function Key Test for most?
The most common reasons people reach for it: checking whether the function row needs the Fn key held down. Confirming F-keys still work after a firmware update. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
Many laptops ship with the function row set to media controls by default, so F1 to F12 only reach the browser while Fn is held. There is usually a firmware setting to reverse this.
Why does the test start on its own?
No installation, no extension and no driver. The Function Key Test uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
Related device tests tools
All 5302
Online Keyboard Tester
A full-size keyboard tester that runs in the browser with nothing to install. Every key you…
03
TKL Keyboard Test
Tests a tenkeyless keyboard — the full layout minus the number pad — including the function…
04
60% Keyboard Test
Tests a compact 60% or 65% keyboard: the alphanumeric block, modifiers and arrows, without the…
05
Numpad Test
Tests every key on the number pad, including Num Lock, the operators and the separate Enter…
06
Arrow Key Test
Tests the four arrow keys on their own. Useful when only the direction keys have stopped…
07
Modifier Key Test
Tests Shift, Ctrl, Alt, Meta, Caps Lock, Tab and Escape, telling the left and right versions…
08
Key Rollover Test (NKRO)
Measures how many keys your keyboard can register at once. Membrane boards usually stop at…
09
Keyboard Ghosting Test
Hold real gaming and typing combinations together and see whether every key arrives — or one…
10
Key Chatter Test
Finds switches that register twice from one press. Flags a key that registers again under 60…