Audio Pitch Shifter Shift the pitch of audio files up or down without changing speed.

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Audio Pitch Shifter

Shift the pitch of audio files up or down without changing speed.

Upload Audio

Drop your audio file or click to browse.

Adjust Pitch

Set the pitch shift in semitones (up or down).

Download

Download the pitch-shifted audio file.

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What Is Audio Pitch Shifter?

The Audio Pitch Shifter raises or lowers the pitch of audio files without changing the playback speed. Shift vocals to a different key, transpose music to match your vocal range, or create special effects by extreme pitch shifting. The tool uses the Web Audio API's detune parameter for precise semitone-based pitch control while maintaining the original tempo through time-stretching compensation. All processing is done locally in your browser for complete privacy. Supports MP3, WAV, OGG, and other common formats.

Why Use Audio Pitch Shifter?

Precise semitone-based pitch control (±12 semitones)
Maintains original speed/tempo while shifting pitch
Real-time preview before downloading
Client-side processing — files stay private

Common Use Cases

Music Transposition

Transpose songs to a different key to match your vocal range.

Vocal Effects

Create chipmunk, deep voice, or other pitch-based vocal effects.

Music Production

Pitch-shift samples and loops to fit your project's key.

Practice

Shift backing tracks to practice instruments in a different key.

Technical Guide

Pitch shifting uses the Web Audio API's AudioBufferSourceNode.detune property, which shifts pitch in cents (1/100th of a semitone). The user-specified semitone value is converted to cents: cents = semitones * 100. To maintain the original duration while changing pitch, the tool compensates with playback rate adjustment: playbackRate = Math.pow(2, semitones/12) in the opposite direction, effectively detuning without speed change. The audio is processed through an OfflineAudioContext sized to the original duration. The source node's detune is set to the target value, and playbackRate is adjusted inversely to maintain tempo. The rendered output is encoded as a 16-bit PCM WAV file. This approach provides clean pitch shifting for moderate shifts (±6 semitones) with some artifacts at extreme values.

Tips & Best Practices

1
One semitone = one half step on a piano (e.g., C to C#)
2
Shifting by ±12 semitones equals one full octave up or down
3
Small pitch shifts (1-3 semitones) produce the most natural results
4
Extreme pitch shifts will introduce noticeable artifacts in the audio

Related Tools

Audio Volume Changer

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Audio Speed Changer

Change the playback speed of audio files without affecting pitch.

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Audio Echo Effect

Add echo and delay effects to audio files.

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Frequently Asked Questions

Q What is a semitone?

A semitone is the smallest interval in Western music — the distance between adjacent piano keys. 12 semitones equals one octave.

Q Does pitch shifting change the speed?

No. The tool compensates to maintain the original tempo while shifting only the pitch.

Q How far can I shift the pitch?

The tool supports ±12 semitones (one octave up or down).

Q Will it sound natural?

Moderate pitch shifts (1-4 semitones) generally sound natural. Larger shifts may introduce artifacts.

Q Is processing done locally?

Yes. All pitch shifting happens in your browser. No files are uploaded to any server.

About This Tool

Audio Pitch Shifter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.