Device tests
Check your hardware and use the sensors and media tools of your device. Test with Dead pixel test, Refresh rate test, Webcam test, Microphone test, Speaker test, Keyboard tester and Gamepad tester. Edit sound and video with Audio converter, Audio cutter, Video compressor and Screen recorder. Musicians get Instrument tuner, Online metronome, Chord finder and Virtual piano; sensors include Decibel meter, Compass, Bubble level and Pedometer.
- Typing speed testType common English words for 30, 60 or 120 seconds and get your WPM and accuracy.
- What is my browserShow your browser and version, operating system, engine, language, cookie and touch support, and copy it all as text.
- Microphone testCheck that your microphone picks up sound with a live level meter and a peak mark.
- Speaker testCheck stereo speakers and headphones with left, right and both channel tones and a frequency sweep from 20 Hz to 20 kHz.
- Webcam testPreview your camera live, see its resolution and frame rate, switch cameras and save a snapshot.
- Keyboard testerPress keys and see them light up on a QWERTY layout with key, code and location shown.
- Screen recorderRecords a screen, window or tab with optional microphone narration and lets you download the video. Runs in the browser, no upload.
- Mouse testCheck that each mouse button registers, detect double clicks, and see the scroll wheel direction and distance in pixels.
- Touch screen testTest a touch screen: draw with multiple fingers, count simultaneous touch points and fill a grid to find areas that do not respond.
- Voice recorderRecords audio from your microphone with pause, a level meter and playback, then lets you download the file. Nothing is uploaded.
- FlashlightA full-screen light with brightness and warm-to-cool colour sliders that keeps your screen awake. Torch mode where the browser allows it.
- Gamepad testerPlug in a controller and see its buttons, analog values and sticks live, find stick drift and test vibration, all in your browser.
- Battery testShows your device battery level, charging state and time to full or empty, live, using the browser Battery Status API.
- Screen resolutionShow your screen size, device pixel ratio, browser window size, color depth and orientation.
- CompassA digital compass that shows your heading in degrees and cardinal direction using your phone's motion and magnetic sensors.
- Network infoShows online status, effective connection type, estimated downlink, round-trip time and Data Saver, plus a quick latency check.
- Refresh rate testMeasure how many times per second your screen redraws, in Hz, from the timing of browser animation frames over two seconds.
- Dead pixel testShow full-screen solid colors so dead pixels, stuck pixels and backlight problems stand out.
- Monitor ghosting testMoving blocks on contrasting rows at selectable speed, so you can see trails, smearing and inverse ghosting on a monitor or TV.
- Color banding testSmooth and stepped gradients in gray, red, green and blue to see whether your screen shows visible bands between 8-bit color levels.
- Gyroscope viewerLive orientation angles, acceleration, gravity and rotation rate from the motion sensors your browser exposes.
- Vibration testPlay ready-made or custom vibration patterns through the browser Vibration API to check that your phone can buzz.
- Camera capabilities checkerList the capabilities and current settings your browser reports for your camera: resolution, frame rate, focus, zoom and more.
- Mouse polling rate testEstimate how many position reports per second your mouse sends, from the timing of browser pointer events.
- WebGL info viewerShow which WebGL version your browser supports, the graphics card it reports, the main limits and all supported extensions.
- Display color gamut checkerFind out which color gamut, dynamic range and color depth your screen and browser report, and compare sRGB red with Display P3 red.
- CPS testClick or tap as fast as you can for 1, 5 or 10 seconds and see your clicks per second.
- Media format support checkerTest which common video and audio formats your browser can play, and what it reports about decoding smoothness and power efficiency.
- Chord finderNotes and diagrams for 15 chord types on guitar, ukulele and piano, with several voicings each.
- Reaction time testPress when the box turns green and get your reaction time in ms, with best, mean and median over several tries.
- Online rulerA ruler on your screen in cm or inches, calibrated against a bank card or your screen diagonal.
- Bubble levelA spirit level for phones that shows tilt in degrees and percent grade on two axes, with a zero button.
- Aim trainerClick 20 targets one by one and see your accuracy and the mean and best time per hit.
- Circle of fifthsInteractive circle of fifths with key signatures, relative minors, neighbouring keys and diatonic chords.
- Decibel meterA microphone sound meter showing level, peak, average and minimum, with optional calibration to approximate dB SPL.
- ProtractorAn on-screen protractor with two draggable arms that shows the angle from 0 to 360 degrees, plus its supplement and complement.
- Tap tempoTap to find the BPM of a song, with milliseconds per beat and delay times for dotted and triplet notes.
- Tone generatorPlay a pure tone at any frequency from 1 Hz to 20 kHz with four waveforms, a log slider and musical note presets.
- Instrument tunerPlay one note at a time and see its name, frequency and how many cents sharp or flat it is.
- Online metronomeA metronome with 20–300 BPM, tap tempo, accented bars, eighth, triplet and sixteenth clicks and a visual beat.
- Number memory testRemember a number shown for a few seconds, type it back, and see how many digits you can hold as the number grows.
- Audio spectrum analyzerA live graph of how loud each frequency from 20 Hz to 20 kHz is, taken from your microphone.
- Capo transposerTranspose chord sheets for a capo, find the best capo fret, or shift all chords up and down by semitones.
- White noise generatorPlay white, pink or brown noise with a volume control and a sleep timer that fades out when it ends.
- Audio oscilloscopeWatch the shape of the sound wave from your microphone, steadied by a zero-crossing trigger.
- Scale finderNotes, degrees, step pattern and diatonic chords of 13 scales and modes in any key.
- Sequence memory testWatch a 3×3 grid light up tile by tile, then repeat the order. One more tile each level.
- Frequency to noteHz to note name, cents and MIDI number, or a note name to Hz, with adjustable A4 reference pitch.
- Hearing range testStep through pure tones from 20 Hz to 20 kHz to see where your headphones, speakers and ears stop responding.
- Audio cutterPick a range on the waveform of an audio file, listen to it and save just that part as WAV.
- Subwoofer sweep testA sine tone that glides from 10 Hz up to 200 Hz so you can hear where your bass starts, rattles or falls away.
- QR code scannerRead a QR code or barcode from your camera or from a picture, and copy or open what it says.
- Mirror cameraUse your front camera as a mirror: mirrored image, full screen, nothing recorded.
- Resistor color codeDecode 4, 5 and 6 band resistor colors into ohms and tolerance, or find the bands for a value.
- Storage quota viewerCheck the storage the browser reports for this site: used, allowed, persistent or not, and the size of localStorage.
- SMD code decoderRead 3-digit, 4-digit, R-notation and EIA-96 resistor codes and 3-digit capacitor codes.
- LED resistor calculatorResistor for an LED or a string of LEDs: exact ohms, next E24 and E12 value, current, power and rating.
- Audio joinerMerge several audio files into one WAV in the order you choose, with an optional crossfade.
- Audio speed changerPlay an audio file faster or slower, from 0.25x to 4x, and download the result as WAV.
- Audio reverserReverse a sound so it plays from the end to the start, and save it as a WAV file.
- Audio converterConvert audio files to 16-bit WAV, or to WebM/Opus or M4A where your browser can record it.
- Geolocation viewerShow the position your browser reports: coordinates, accuracy radius, altitude, speed and heading, once or live.
- Ambient light viewerLive illuminance in lux from the device's light sensor, where the browser allows it, with min, max and a rough lighting description.
- Scroll wheel testSpin the mouse wheel and see each delta, direction reversals and whether the scrolling looks notched or smooth.
- Double click testMeasure the gap between clicks per mouse button and flag clicks less than 80 ms apart as possible chatter.
- Key rollover testPress and hold many keys at once and see the largest number your keyboard reports together.
- Audio latency testShow the audio latency your browser reports and estimate total delay by tapping along to beeps.
- CPU benchmarkRun four fixed JavaScript workloads in a background worker and compare your own scores run to run.
- Monitor gamma testPlates of fine black and white lines on a solid gray. The plate where the lines blend in marks your screen's approximate gamma.
- PedometerApproximate step counter using your phone's motion sensor, with cadence and a rough distance from your stride.
- Browser permissions viewerA table of the permission states your browser reports for this site: granted, ask, blocked or not supported.
- Media devices listerLists the cameras, microphones and audio outputs visible to your browser, with their names when you allow access.
- Video trimmerCut a section from a video by start and end time and save it as a new clip.
- Video speed changerSpeed a video up or slow it down, from 0.25x to 4x, and save the new file.
- Mute videoRemove the sound from a video and save a silent copy of the picture.
- Video rotatorRotate a video by quarter turns or mirror it, and save the corrected file.
- Video compressorReduce a video's file size with a smaller frame size and a lower bitrate, in your browser.
- Virtual pianoA playable two-octave keyboard with chords, octave shift and four sounds, played by mouse, touch or keys.
- Drum machineA 16-step drum sequencer with kick, snare, hats, clap, tom, rim and cowbell, tempo and swing.
- Audio volume boosterMake a recording louder by a set number of decibels, or bring its peak to a target level.
- Audio fade toolFade a recording in at the start and out at the end, with the length of each fade in seconds.
- Audio pitch changerShift the pitch of a recording up or down by semitones without changing its length.