Audio test tools
Every tool runs in the browser. Nothing is uploaded, nothing is installed, and no audio file is downloaded — each signal is generated on your device as you play it.
Tone Generator
Generate a pure tone at any frequency from 20 Hz to 20 kHz, in four waveforms. This page also carries the frequency sweep, to hear where your hardware or hearing drops out.
Bass & Subwoofer Test
Sweep 20-200 Hz to hear where your bass starts, and find the frequencies that rattle. This page also carries the subwoofer kick, for testing impact, port noise and how a driver handles transients.
Hearing Range Test
Step up through the frequencies and find the highest tone you can hear.
Microphone Test
Check that your microphone is picking up sound, and watch the level move as you speak. This page also carries record & play back, to hear what other people hear.
Speaker Test
Play a tone into the left speaker, the right speaker, or both, and confirm each one is working. This page also carries balance & separation, to check hard left, centre and hard right for a balance that has drifted.
Headphone Test
Play the same low tone in phase and then inverted — out of phase sounds hollow, with no centre. This page also carries channel swap, to find out whether your left and right channels are the right way round, or whether one of them is dead, and stereo imaging, to check the phantom centre and how stable the image is.
Noise Generator
Play white, pink or brown noise — for testing speakers, masking sound, or hearing the difference between them.
Surround Sound Test
Step through each speaker of a 5.1 or 7.1 system in turn, and confirm the sound comes from where it should.
Full Sound Check
Run through left, right, balance, polarity, bass and treble in one guided pass, and get a summary of what passed and what to look at.
Start quiet. Set your system volume low before playing anything, then raise it gradually. Test tones carry far more energy than music at the same nominal level, and high frequencies can be much louder than they sound.
Which one do you need?
If a speaker is silent or distorted, start with the tone generator — one frequency at a time is the cleanest way to ask hardware a single question. If something buzzes or rattles only on certain material, the noise generator and the frequency sweep find it faster, because they excite every resonance in turn rather than one at a time.
If you are checking a subwoofer, or want to know where your speakers stop producing bass at all, use the bass and subwoofer test. If you are curious how far up your hearing reaches, the hearing range test steps through the top of the audible range — though it is a rough guide, not a medical measurement, and the copy on that page explains why.