Check your display, speakers and more

Free online tests for your monitor, pixels, speakers, microphone, webcam, keyboard and more. They run in your browser, on any device.

No account, no installation. Tests run directly in your browser.

Display tests

Find dead pixels, check the refresh rate, and look for backlight bleed, uneven brightness, color problems, banding and ghosting.

Featured tests

Monitor Test
Fill any monitor, laptop, phone or TV screen with solid colors to check it for visible faults.
Dead Pixel Test
Fill the screen with five solid colors to spot dead, stuck and hot pixels.
Stuck Pixel Fixer
Flash random colors over the whole screen for a timed run to try to free a stuck pixel.
Refresh Rate Test
Check the refresh rate your screen is running at, in Hz, and see how smooth that rate looks.
Ghosting Test
Watch moving blocks, bars, text and lines for ghosting trails, motion blur and overdrive halos.
Screen Uniformity Test
Fill the screen with white, 50% gray, black, red, green and blue to spot clouding, mura and tint shifts.

More display tests

Confirm speakers and headphones work, left and right, and hear the full frequency range, bass, treble, balance and distortion.

Featured tests

Speaker Test
Play a tone through the left, right or both speakers to check that each side works.
Headphone Test
Play a tone in each ear to check both sides of your headphones or earbuds.
Audio Balance Test
Move a tone between left and right to hear whether one side is louder.

More audio tests

Check that your microphone works in seconds: watch a live input level, record a short clip, or use the test built into your system.

Microphone Test
Speak and watch a live level meter to check that your microphone works and the right one is used.
Mic Test with Playback
Record up to 30 seconds from your microphone, then play it back to hear how you sound.

Check every key, mouse button, touch point and gamepad control from your browser.

Featured tests

Keyboard Test
Press each key and watch it light up to find dead, stuck and double-typing keys.
Mouse Test
Click each button, scroll the wheel and move the pointer to check a mouse or touchpad.
Touch Screen Test
Paint a grid with your finger to find dead zones and see how many touches register at once.

More input tests

Check that your webcam works before a call: see a live preview, the resolution and the frame rate it delivers, or use your system’s camera app.

Featured tests

Webcam Test
Start a live preview to check that your camera works and see the resolution and frame rate it delivers.
Webcam and Mic Test
Check your camera and microphone together before a call: a live preview and a mic level meter.

More camera tests

See what your browser knows about your screen, device and supported web features.

Featured tools

Device Info
See what your browser reports about your device, screen, language and time zone, and copy it.
Screen Resolution Test
See your screen resolution, viewport, device pixel ratio and aspect ratio, and how they relate.
Screen DPI Test
Estimate your screen's pixel density in PPI from its diagonal, and check the browser's nominal inch.

More device tools

Short walkthroughs that answer one question each and take you to the right test.