Change the key of a song
Move a song up or down by semitones at the same tempo, to sing or play along in your key.
Drop files here
or click to choose from your deviceAccepted: MP3, M4A, AAC, WAV, OGG, OGA, OPUS, FLAC, WEBA, MP4, M4V, MOV
Up to 3 files per runUp to 150 MB per file5 runs per dayRemove limits with Pro✓ Works offline
Your files stay on your device
This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.
Example
Example: a song in E sung in C, four semitones down at the same length
song.mp3, 3 minutes 42 seconds, is in E major, but the singer is comfortable in C. From E down to C is four semitones (E♭, D, C♯, C), so the setting is −4. Save as: Same as the original (OGG, FLAC → MP3), at the default 192 kbps.
- Every pitch is multiplied by 2^(−4/12) ≈ 0.794: the A above middle C, 440 Hz, comes out at 349.23 Hz, which is an F.
- The sound is stretched in time and then resampled by the same factor, so the pitch moves while the length comes back to exactly 3:42.
- Press Change key: the download is song-key-4.mp3.
| Semitones | Pitch × | 440 Hz becomes | A song in E ends up in |
|---|---|---|---|
| −1 | 0.9439 | 415.30 Hz | E♭ |
| −2 | 0.8909 | 392.00 Hz | D |
| −3 | 0.8409 | 369.99 Hz | C♯ |
| −4 | 0.7937 | 349.23 Hz | C |
| −5 | 0.7492 | 329.63 Hz | B |
| +2 | 1.1225 | 493.88 Hz | F♯ |
| +12 | 2.0000 | 880.00 Hz | E, an octave up |
song-key-4.mp3, still 3:42 and at the original tempo, four semitones lower. Sing it through once: if the high notes are still a stretch, try −5; if the low ones are hard to reach, −3.
How it works
- Drop the song, backing track or video.
- Set how many semitones to move: −2 lowers the key by a whole step, +12 raises it an octave.
- Keep the format, or choose MP3, M4A or WAV.
- Press Change key and download. The tempo stays exactly the same.
Frequently asked questions
- How much should I lower it?
- Try −2 or −3 first. A man singing a song written for a woman’s voice often needs about −4 to −5; a woman singing a man’s song, about +4 to +5.
- Does the speed change?
- No. The sound is stretched and resampled so that only the pitch moves; the length stays the same to the sample.
- Does it sound different?
- A step or two is hard to notice. Large shifts, especially upwards, make voices sound thinner, as every pitch shifter does.
- How do I work out the number of semitones?
- Count the steps between the two keys on a piano, black keys included: C up to D is 2, E down to C is 4, G up to A is 2. Moving down 5 or up 7 lands on the same key, an octave apart, so pick whichever is nearer to your voice.
- How far can it move?
- Twelve semitones up or down, a full octave, in whole semitones. −12 halves every frequency and +12 doubles it; the length of the song stays the same either way.
- Is the song uploaded?
- No. It is processed in your browser; a video keeps its picture untouched.