Tech calculators

Dead Pixel Test

Check a monitor, laptop, or phone screen for dead, hot, and stuck pixels with a full-screen color test, plus a pixel-refresh flash mode for stuck sub-pixels.

Keyboard Test

Test every key on your keyboard with a live virtual layout, check how many keys register at once (rollover), and see which keys never registered.

Mouse Test

Test all five common mouse buttons (right-click included), measure your double-click interval against the default Windows setting, estimate the report rate, and count scroll ticks.

Touchscreen Test: Find Dead Zones

Touchscreen test: sweep a finger over a 12x18 grid to spot dead zones, press several fingers to see how many register, and watch a live log of every touch event.

Refresh Rate Test: Check Your Screen's Real Hz

Refresh rate test: measure the Hz your display is actually presenting at right now, with the frame-period spread and slow-frame count behind the number.

Scroll Test: Check Wheel Skips, Direction & Speed

Scroll test for mouse wheels and trackpads: count up/down ticks, flag oversized jumps that look like skips, and read delta mode and speed in this tab.

Sound Test: Left / Right Speaker Check in the Browser

Sound test for PC and phone speakers: play left-only, right-only, and stereo sine tones in this tab, then record Heard or Silent for each channel to spot a mute or swap.

MP3 Converter

Convert WAV, FLAC, Ogg, M4A, and MP3 to MP3 in the browser. Pick 128, 192, or 320 kbps, convert a batch, and download. Audio never leaves this device.