Check every physical keyboard key, see real-time keydown and keyup states, inspect key codes, and test simultaneous-key rollover directly in your browser.
Start capture, press each physical key once and hold combinations to check rollover.
Main keyboard
Numeric keypad
No keys are currently held.
Hold two or more keys together to record a combination.
| # | Type | Key | Code | Location | Repeat | Modifiers | Time |
|---|---|---|---|---|---|---|---|
| Start the test and press a key to build the event history. | |||||||
Visible keys not yet tested
The untested-key list will appear after the keyboard view loads.
Detected codes not drawn in the selected layout
No extra key codes detected.
Start capture and hold a deliberate combination. Every browser-reported key appears in the held-key list, while Maximum simultaneous records the largest group seen during the session. A missing expected key can indicate a matrix, firmware, connection or shortcut limitation.
One successful combination does not prove full N-key rollover. Test combinations relevant to your games or shortcuts, including keys from the same keyboard region. Avoid operating-system commands that could close, lock or switch applications.
The visualizer primarily matches KeyboardEvent.code, which identifies a physical position such as KeyQ, ShiftLeft or Numpad1. The W3C maintains the standardized code-value list. Read the keyboard code specification.
The latest-event inspector also shows KeyboardEvent.key. That value can change with the active language layout, Shift state, Caps Lock and other modifiers. Held keys can generate repeat keydown events marked by the browser. Review keyboard key behavior.
Select Compact main keys or Tenkeyless to reduce visual clutter. Laptop Fn combinations often change brightness, volume or hardware state without sending a separate Fn event, so the browser may only receive the resulting action—or nothing.
Use the tested outline to check switch registration after a build, cleaning or switch replacement. Use combination history for game-control clusters. This page does not measure switch force, debounce electrically, USB polling rate or end-to-end input latency.
Select the full-size, tenkeyless or compact visual layout and choose Windows, macOS or physical-code labels.
Press Start Keyboard Test. The page begins listening for physical keyboard keydown and keyup events until you stop or press Escape.
Tap each physical key once. The matching visual key receives a tested outline, while keys currently held down receive a stronger active outline.
Hold several keys together to review simultaneous-key rollover, then inspect the reported key, code, location, modifiers, repeats and event history.
Copy or download the report and CSV event log, then clear the event history or reset the entire keyboard test for another device.
Confirm that capture is active and the page has focus. Try the key without a browser shortcut combination, reconnect the keyboard and test another browser or device. If the code is valid but not drawn, it should appear in Extra detected keys.
Webpages cannot guarantee control over browser, operating-system or firmware-reserved keys. Function-layer keys, power controls, biometric keys and some media controls may never generate a normal event. The browser’s keydown documentation explains how event targets and composition can vary. Read keydown documentation.
When the tab is hidden or the window loses focus, keyup can be missed. The tester clears active highlights on blur and visibility changes. Restart the combination after returning to the page.
The page-specific engine processes keyboard events in the current browser and does not submit captured keys or reports. No account, file upload, page-specific analytics event, permanent key log or server processing is added by this tool.
An online keyboard test listens for browser keyboard events and highlights the corresponding keys on a visual layout. It helps confirm that a physical key press reaches the browser.
Choose a layout, press Start Keyboard Test and then press keys on your physical keyboard. Press Escape or the Stop button when you are finished.
Active means the browser currently considers the key held down. Tested means at least one distinct keydown was received for that physical key during the current session.
It can detect keys that generate browser keyboard events. Some function-layer, firmware, media, biometric, brightness and operating-system-reserved keys may not reach a webpage.
The key value describes the interpreted key value, such as a character or named action. The code value identifies the physical key position, such as KeyQ or Numpad1, independently of the active language layout.
The reported key value follows the active operating-system keyboard layout and modifier state. The physical code can remain the same even when the produced character changes.
The visualizer covers common full-size PC positions and records any additional browser-reported code. ISO-specific keys such as IntlBackslash can appear in the detected-extra-keys area when they are not present in the selected drawing.
Yes. Choose the compact or tenkeyless view if it better matches the laptop. Function-layer actions controlled through an Fn key may remain outside browser detection.
Yes. You can verify individual switches, repeated presses and simultaneous combinations. The browser result does not replace firmware, electrical or latency testing equipment.
Yes, provided the operating system has connected the keyboard and the browser receives its key events. Connection drops or power-saving behavior can still affect the device outside the webpage.
Ghosting commonly refers to a combination where an expected key is not reported or an unintended key appears. Hold several keys together and compare the active-key list with the keys you are physically pressing.
Rollover describes how many simultaneous key presses a keyboard can report correctly. The maximum concurrent value shown here is the greatest number of browser-reported keys held together during this session.
No. A browser session tests only the combinations you press and can be influenced by the operating system, connection and browser. It does not certify every possible key combination.
The tester separates the initial keydown from auto-repeat events. Repeated events are counted in a separate metric so one held key does not look like many distinct presses.
Repeat becomes true when the browser reports additional keydown events because a key is being held. Repeat timing is controlled by the operating system and keyboard settings.
Yes. The visualizer uses physical code and location information to distinguish common left, right, standard and numeric-keypad positions when the browser provides them.
The key may highlight when the browser receives it, but operating-system shortcuts can take priority. Avoid combinations that close, switch or lock applications.
Usually, but browsers or operating systems can reserve actions such as Help, refresh, brightness or media control. A reserved action may occur before the page can record or cancel it.
Usually not. Fn is commonly processed inside keyboard hardware or firmware and often does not generate a standard browser keyboard event.
Some media keys generate browser-visible named events, while others are handled directly by the operating system or device firmware. Unmapped events are shown as extra detected keys when possible.
Safe capture mode preserves important browser accessibility behavior. Full capture attempts to prevent more default actions, but reserved browser or operating-system shortcuts can still win.
Safe capture prevents common page movement from Space, arrows, Page Up, Page Down, Home, End and Backspace while leaving many browser shortcuts and focus behaviors available.
Full capture calls preventDefault for most keydown events while the test is active. It still cannot guarantee control over browser-reserved or operating-system-reserved shortcuts. Escape always stops the test.
A webpage can miss keyup when focus changes. This tool clears held-key states when the page loses visibility or focus and displays a warning so stale highlights do not remain.
The page layout works on mobile, but most on-screen keyboards do not expose physical key positions in the same way. A connected hardware keyboard provides more useful results.
No. Event timestamps describe when the browser received events, but they do not isolate switch scan rate, USB polling, wireless delay, display delay or operating-system scheduling.
No. It can help confirm whether the browser receives a key. Cleaning, remapping, firmware updates, switch replacement or professional repair may be needed for a hardware problem.
Yes. Download a text report containing the tested and untested keys, metrics and recent combinations, plus a CSV file containing the captured event history.
No page-specific request sends the captured keys or event history to a server. The keyboard test state remains in the current browser page and is cleared when you reset or leave.
No. It listens only while this page is open and the test is active. Do not type passwords or sensitive text into any keyboard testing page.
No. A current browser with JavaScript enabled is sufficient. No extension, account, file upload or browser permission prompt is required.
Current Chrome, Edge, Firefox and Safari versions support the keyboard events used here. Exact behavior for special keys and reserved shortcuts varies by browser, operating system and device.
Count spacebar presses and measure space-bar speed with timed CPS challenges.
Open ToolReaction Time TestMeasure how quickly you respond to a visual signal.
Open ToolCPS Test – Kohi, Jitter & Click Speed TestMeasure clicks per second with multiple clicking modes.
Open ToolDead Pixel TestInspect monitors, TVs and phone screens with fullscreen solid-color test pages.
Open ToolColor Blindness TestTake an Ishihara-style color-vision screening with display checks and result guidance.
Open ToolOnline RulerUse a calibrated actual-size ruler in centimetres, millimetres and inches.
Open ToolAspect Ratio CalculatorCalculate ratios, missing dimensions and crop or contain sizes for images and video.
Open ToolDead Pixel FixerLocate stuck pixels and run a targeted rapid color cycle over the affected area.
Open ToolRegex TesterTest regular expressions with live highlighting, capture groups and replacement preview.
Open ToolMarkdown EditorWrite and preview Markdown with shortcuts, document checks, import and HTML export.
Open ToolCSS GeneratorGenerate gradients, layered box shadows and border radius with live previews and code.
Open ToolHijri Date ConverterConvert Gregorian and Hijri dates with Umm al-Qura and Islamic civil options.
Open ToolChinese Zodiac & Korean Age CalculatorFind Chinese zodiac details and calculate international, Korean and lunar age.
Open ToolOvulation CalculatorEstimate ovulation, fertile days, cycle dates and the next expected period.
Open ToolPregnancy Due Date CalculatorEstimate due date, gestational age and pregnancy calendar from LMP, IVF or conception.
Open ToolZakat CalculatorCalculate Zakat for gold, silver, cash, investments and business assets using Nisab.
Open Tool