How to Test All Keyboard Keys in a Browser
A browser key tester can identify keys reaching a website, including their logical key values and hardware codes.
Before you begin
Start with reversible settings checks. Keep your device supported and powered safely. Do not force connectors, open sealed batteries or try high-voltage repair steps.
Step-by-step testing instructions
- 01
Focus the test panel
Click inside the tool before typing.
- 02
Press one key at a time
Confirm each key produces the expected event.
- 03
Test modifier combinations
Hold Shift or Control with ordinary characters without triggering dangerous shortcuts.
- 04
Check repeat behavior
Hold a safe letter key and inspect the stream of key events.
- 05
Try another application
If one key fails in multiple contexts, compare with an external keyboard.
Check the result.
Some system-reserved keys never reach JavaScript; their absence alone is not proof of hardware damage.
Open the related test ↗When to get professional help
If the same problem occurs in multiple compatible applications or devices after safe checks, follow the manufacturer's exact support instructions or ask a qualified repair professional. A browser test cannot prove every hardware component is healthy.