Function Key Tester
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This tool isolates the function row - F1 through F12 - for a focused diagnostic separate from the rest of the keyboard. Press each function key and it marks as tested on the on-screen row, with a progress counter tracking how many of the 12 keys you've confirmed. Function keys often go unused for long stretches (until you suddenly need F2 to rename a file or F11 for fullscreen), so a quick, dedicated test is the fastest way to confirm they all still work, especially after a spill, a repair, or when troubleshooting a laptop with an Fn-key toggle that changes what the row sends by default.
Features
- Dedicated F1-F12 diagram
- Persistent tested-key marking with progress counter
- Key name and code details per press
- Faster than locating function keys within a full keyboard test
Why use this function key tester?
- Instant results with no page reloads or server round trips
- 100% private - everything runs locally in your browser, nothing is uploaded
- Focused specifically on the often-overlooked function row
- Completely free with no signup, installs, or usage limits
Frequently asked questions
Why doesn't a function key seem to register?
Many laptops require holding Fn to send a standard F-key code by default (or vice versa, depending on a BIOS/OS setting) - check your Fn Lock state if a key isn't registering as expected.
Does this test media/brightness functions on F-keys?
It tests the underlying F1-F12 key codes your browser receives; some laptops send media-key codes instead unless Fn Lock changes that behavior.
Can I test just one function key?
Yes, press any single key in the row - you don't need to test them in order or all at once.