Change Audio Pitch Online — Shift Key Up or Down
A browser-based pitch shifter that lets you change the key of any song with semitone and cent precision. Features automatic key detection, BPM analysis, real-time preview, formant preservation, and key-to-key transposition — all processed locally in your browser.
How to Change Audio Pitch
Drag and drop or click to upload an MP3, WAV, FLAC, OGG or other audio file. The tool automatically detects the key and BPM.
Use the semitone slider (-24 to +24) and cents slider (-50 to +50) for precise pitch control. Or use quick presets for common intervals.
Enable "Lock tempo" to keep the original speed. Use "Preserve formants" for natural-sounding voice. Or use the transpose helper to shift between keys.
Click Preview to hear the result instantly. Choose your output format (MP3, WAV, FLAC, OGG) and quality, then download the pitch-shifted file.
Transpose songs, shift musical key, and fine-tune pitch of any audio file instantly
Transpose by key
Apply pitch to
Semitones, ratios and what they do
Each semitone multiplies the frequency by 2^(1/12) ≈ 1.0595, so twelve of them double it — one octave. The last column shows what would happen to the length if pitch and tempo moved together, the way a tape player changes both at once.
| Semitones | Frequency | Length if tempo followed |
|---|---|---|
| -12 | ×0.5000 | 200.0% |
| -7 | ×0.6674 | 149.8% |
| -5 | ×0.7492 | 133.5% |
| -3 | ×0.8409 | 118.9% |
| -2 | ×0.8909 | 112.2% |
| -1 | ×0.9439 | 105.9% |
| +1 | ×1.0595 | 94.4% |
| +2 | ×1.1225 | 89.1% |
| +3 | ×1.1892 | 84.1% |
| +5 | ×1.3348 | 74.9% |
| +7 | ×1.4983 | 66.7% |
| +12 | ×2.0000 | 50.0% |
Here they do not have to move together: pitch and tempo are separate controls, so a track can change key at its original speed, or slow down without dropping in key. Range is ±24 semitones in steps of 0.1.
What You Can Do
Frequently Asked Questions
What is pitch shifting?
Pitch shifting changes the musical key of audio without altering its speed. Moving pitch up makes sounds higher (like singing in a higher key), while moving it down makes them lower. Each semitone equals one piano key step.
How many semitones can I shift?
You can shift pitch up or down by up to 24 semitones (2 full octaves). For fine-tuning, use the cents slider which adjusts in 1/100th of a semitone increments. Most key changes require 1-7 semitones.
What does "Lock tempo" do?
With Lock tempo ON (default), the song's speed stays the same when you change pitch — only the key changes. With Lock tempo OFF, both pitch and speed change together, similar to playing a vinyl record faster or slower.
What does "Preserve formants" do?
Formants are the natural resonances of the human voice. Without formant preservation, large pitch shifts make voices sound unnatural (chipmunk effect when raising, monster effect when lowering). Enabling this option keeps the voice character natural.
How does automatic key detection work?
The tool analyzes the frequency spectrum of your audio using the Krumhansl-Schmuckler algorithm. It compares the energy distribution across 12 pitch classes with known major and minor key profiles to identify the most likely key of the song.
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Comments
Very easy to use. Gives artists exactly what they need.
