Physical and logical key evidence
Compare `code` for physical position with `key` for the interpreted character.
Visual key and rollover tester
Test every keyboard key in your browser.
See physical key codes and typed values separately, spot repeats or stuck keys, and test combinations without installing software.
Use the free toolFocused local event capture
keyboard tester
The tester captures keys only while its test surface is focused. It never runs in the background and never sends the event log anywhere.
Click or Tab here to begin testingCapture ends immediately when focus leaves this panel.
Held now: None
Ready
Private by design. Key events are processed only inside the focused tester and are cleared on reset or tab close.
Observed events
Physical and logical key evidence
—Physical code
—Logical key
0Keys tested
0Maximum heldObserved combination, not an NKRO certification
0Repeat keydowns
| Type | Code | Key | Repeat | Modifiers |
|---|---|---|---|---|
| Focus the surface and press a key. | ||||
The jobs this tool completes
Built around the failure points.
Stuck and repeat visibility
Show keydown, keyup, repeat, and currently held state so a missing release is obvious.
Combination and rollover test
Display simultaneous held keys and the maximum observed combination without claiming hardware certification.
Workflow
From input to an auditable output.
- Choose a visual layout and focus the marked test surface.
- Press and release individual keys, modifiers, and safe combinations while watching held and tested states.
- Review the event log, repeat counts, and observed rollover, then reset before testing another keyboard.
Learn the details
Use the result with fewer surprises.
Guide
KeyboardEvent key vs code
Understand the difference between a typed character, a physical key position, modifiers, repeats, and browser-reserved keys.
Read guide →GuideHow to test keyboard rollover
Check simultaneous key recognition, ghosting symptoms, modifiers, and the limits of a browser-based rollover test.
Read guide →Common questions
What this tool does—and does not do.
Physical and logical key evidence
Compare `code` for physical position with `key` for the interpreted character.
Stuck and repeat visibility
Show keydown, keyup, repeat, and currently held state so a missing release is obvious.
Combination and rollover test
Display simultaneous held keys and the maximum observed combination without claiming hardware certification.
Does this guarantee the result will be accepted elsewhere?
No. The tool completes and explains its calculation or transformation, but another platform can apply different limits, rules, encoders, or policies. Verify consequential output in the destination.
Ready
Focus keyboard test
Return to the tool with your inputs still in this tab.