Audio & screen online tools
Speech, tones, light, screen info. 6 tools.
FlashlightTurn your screen into a light. Choose a colour, set the brightness, go fullscreen, or use strobe mode.Ruler (cm)A 30 cm on-screen ruler with millimetre markings, calibrated against a bank card so the measurements are true to life.Ruler (inches)A 12 inch on-screen ruler marked in sixteenths, calibrated against a bank card so what you measure matches the real thing.Screen resolutionSee your screen resolution, browser window size, pixel ratio, colour depth and aspect ratio — updated live as you resize.Text to speechHave any text read aloud with your device's own voices. Adjust speed, pitch and volume — nothing is uploaded to a server.Tone generatorPlay any frequency from 20 Hz to 20 kHz with a choice of waveform, volume and left/right channel — for testing speakers, tuning and hearing checks.