Free Online Pitch Changer
Shift audio pitch up or down by semitones. Transpose music, create harmonies, change voice pitch — up to ±12 semitones with musical interval labels.
- Free
- No sign-up
- Stays on your device
Why use this tool
±12 Semitone Range
Shift pitch up or down by up to one full octave (12 semitones).
Musical Interval Labels
See the musical interval for each shift — minor 3rd, perfect 5th, octave, etc.
Quick-Pick Buttons
Jump to musically useful intervals: −5 (perfect 4th), +7 (perfect 5th), ±12 (octave).
Live Preview
Preview the pitch-shifted audio before exporting.
100% Private
All processing happens in your browser — nothing is uploaded.
Any Audio Format
Works with MP3, WAV, OGG, M4A, FLAC, and more.
Frequently asked questions
It uses the Web Audio API's AudioBufferSourceNode with a playbackRate value of 2^(semitones/12). This is the standard mathematical relationship between semitones and frequency ratios.
Yes — this tool uses rate-based pitch shifting, so duration changes proportionally. Shifting +12 semitones (one octave up) halves the duration. Shifting −12 (one octave down) doubles it. True pitch-only shifting (formant-preserving) requires more complex algorithms.
A semitone is the smallest interval in Western music — the distance between adjacent keys on a piano. 12 semitones = 1 octave. Common musical intervals: minor 3rd = 3 st, perfect 4th = 5 st, perfect 5th = 7 st.
Currently the tool works in whole semitone steps. For fine-tuned pitch adjustment, use the Audio Equalizer or contact us for feature requests.
No. Pitch shifting runs entirely in your browser using OfflineAudioContext.
Exported audio is a lossless WAV file.
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