Change voice pitch and add effects to audio recordings in real-time.
The voice in any recording is defined by its frequencies, and this tool multiplies them all by a chosen amount. Load an audio file or talk into the microphone, set the pitch in semitones, and the change happens live as you adjust - with effects such as echo or a robotic tone stacked on top. What most people get wrong: raising the pitch does not speed up the speech. The words keep their original duration; the register moves, and with it the tone color, which is why +12 tends to sound cartoonish and -12 deep and unnatural.
A concrete input and expected output from the current implementation.
Input
A recording of a voice saying 'testing, one, two' with a fundamental near 110 Hz, processed at +12 semitones with no effects.
Expected output
The same words at the same duration, with every frequency doubled: a 110 Hz fundamental becomes 220 Hz, so the voice sounds exactly one octave higher - cartoonish and small but fully intelligible.
Twelve semitones is one octave: each semitone multiplies frequencies by 2^(1/12), so 12 semitones multiply them by 2^(12/12) = 2. Pitch shifting changes the frequencies without changing the timing, so the clip's length is untouched.
The pitch control is calibrated in semitones, the standard interval unit in music. One semitone multiplies every frequency in the recording by 2^(1/12), about 1.059, so twelve semitones produce a factor of exactly 2 - one octave up - and minus twelve produce a factor of 1/2. The entire harmonic spectrum moves together, which is what changes the voice's character, not just its height.
Processing is real-time: with a clip loaded or the microphone live, you move the pitch and effect controls and hear the result immediately, without rendering. Once the settings are right, the altered audio is produced as a finished recording you can play back or download. Everything happens in the browser, so the sound never leaves the machine while you work.
No. The pitch change and the timing are handled independently, so the words keep their original length at any pitch setting. Speeding a recording up would raise pitch and speed together - that is the tape-era chipmunk effect people remember - but a pitch shift alone never changes the duration.
No. The tool runs entirely in the browser: the file you load and anything captured from the microphone are processed on your device and never leave it. A practical consequence is that very long or high-resolution clips are limited by your machine's processing power, so a long recording may take a moment before the altered version is ready.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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