All tools
Frequency generator
A sine, square, triangle or saw wave at any frequency from 1 Hz to 22 kHz, in either ear. Free, with no account or uploads.
Play a tone at any frequency
Set the frequency and press Play. Start quiet: high, loud tones can harm hearing.
Turn your device's volume down before you start, then up slowly.
Common frequencies
100 Hz440 Hz1 kHz10 kHz
Play in
Both earsLeftRight
Wave shape
SineSquareTriangleSaw
Tones are made by your browser; nothing is downloaded, sent or kept. High and loud tones can harm hearing and speakers: start quiet.
A little help along the way
Turn your volume down first. Every option is explained underneath.
- Say what you want to playA steady tone, a sweep, or the highest tone you hear.
- Set the frequencyWith the stepper or a chip, from 1 Hz to 22 kHz.
- Press PlayStart quiet and turn up slowly.
Questions people ask
- Which frequencies can it play?
- From 1 Hz to 22 kHz, though what you hear depends on your speakers and ears: most speakers play little below 50 Hz.
- Can I play two tones at once?
- Yes, up to three, under More options, in both ears, the left or the right.
- Is it safe?
- Start quiet: loud tones, high ones above all, can harm hearing and speakers. The page starts at a low volume.
This page is the Tone generator, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Tone generator's own page.
Read the step-by-step guide