How to change the key of a song
- Add your song. Drop in an MP3, WAV, M4A, FLAC or other audio file. The tool analyses the music and shows the detected key, for example A minor.
- Choose the new key. Pick the key you want from the list, or shift the pitch up or down in semitones. Use Fine tune for adjustments smaller than a semitone.
- Keep it natural. Leave Keep original tempo and Natural-sounding vocals on for the most realistic result.
- Download. Press Change key, listen to the result, and save it as MP3 or WAV.
Why change the key of a song?
- Singing and karaoke. If a song is too high or too low for your voice, move it a few semitones to a comfortable range. Pair it with the Vocal Remover to make a karaoke track in your own key.
- Playing along. Match a recording to your instrument's tuning, or to a capo position you already know. Tune-down guitarists can shift a song down a semitone (−1) to play along in E♭ standard.
- Practice and teaching. Transpose exercises and backing tracks into every key to build fluency.
- DJing and mash-ups. Move two tracks into the same or a compatible key so they blend without clashing (harmonic mixing).
- Fixing tuning. Old recordings and tapes are often slightly sharp or flat. Use cents to nudge them back to standard A = 440 Hz.
How it works
Automatic key detection
The tool builds a chromagram: over the whole song, it measures how much energy falls on each of the 12 notes (C, C♯, D and so on). It compares that profile with the classic Krumhansl–Schmuckler profiles for all 24 major and minor keys and picks the best match. Songs with a clear tonal centre are detected reliably. It also shows the second most likely key, because a key and its relative major or minor (for example C major and A minor) share the same notes.
Pitch shifting without changing tempo
Pitch shifting is done with Signalsmith Stretch, a modern polyphonic pitch- and time-stretching engine. It analyses the audio in the frequency domain and moves every partial to its new pitch while keeping the timing intact. It handles chords, full mixes and drums much better than older methods.
With Natural-sounding vocals turned on, the tool also preserves the formants, the resonances that give each voice its character. Without formant preservation, a voice shifted up sounds like a chipmunk and one shifted down sounds like a giant. With it, the singer simply sounds like they're singing higher or lower.
If you turn off Keep original tempo, pitch and speed change together, like speeding up or slowing down a record. That's useful for creative "nightcore" or "slowed" edits.
Semitones and keys: a quick guide
| Shift | Example | Typical use |
|---|---|---|
| −1 semitone | E → E♭ | Play along in E♭ tuning, or ease a song that's slightly too high |
| ±2 semitones | C → D, or C → B♭ | The most common adjustment for a singer's range |
| ±5 semitones | C → F, or C → G | Move a song into a different voice type |
| ±12 semitones | C → C (one octave) | Octave shifts, for example to adapt a male vocal range for a female singer |
Small shifts of up to 3–4 semitones sound the most natural. Larger shifts work too, but the character of instruments and voices changes more noticeably.
Frequently asked questions
Can I change the key without changing the speed?
Yes. That's the default. Keep original tempo is on, so the song keeps exactly the same length and speed while the pitch changes.
How accurate is the key detection?
It's reliable for most pop, rock, folk and classical music with a clear tonal centre. Songs that change key, are heavily atonal, or are mostly drums can be misread. That's why the second most likely key is shown too, and you can always choose the shift manually.
Can it change a song from major to minor?
No. Changing a song's scale mode would mean changing individual notes of the melody and chords, which requires note-level editing. This tool transposes the entire song, so a major song stays major and a minor song stays minor, just in a new key.
Will the singer sound like a chipmunk?
Not with Natural-sounding vocals turned on. Formant preservation keeps the character of the voice, so it sounds like the same person singing in a different key.
Is it free, and is my song uploaded?
It's completely free, and nothing is uploaded. Key detection and pitch shifting both run in your browser on your own device.