Transpose Audio
Move a song into a new key, up or down by as much as 12 semitones, without changing its speed. It runs in your browser, so your file never leaves your device.
How to change the key of a song
- Drop in a song (MP3, WAV, M4A, FLAC, OGG, or AAC).
- Choose how many semitones to move it, up or down, as far as a full octave.
- Press Transpose and listen to the preview.
- Download the new version as MP3 or WAV. The tempo and length stay exactly as they were.
A new key, the same tempo
Transposing moves every note of a song up or down by the same interval, so the melody and chords keep their shape and simply sit higher or lower. One semitone is one piano key. Two semitones is a whole step, the distance from C to D. Twelve semitones is a full octave.
Under the hood this tool does two things. It resamples the audio by the exact ratio for the interval you picked, which moves the pitch but would also change the speed, then it time-stretches the result by the opposite amount with FFmpeg’s atempo filter. The song ends up in the new key at its original tempo and length, so it still lines up with a click track or another recording.
When changing the key helps
Singers are the most common case. If a chorus sits just out of reach, moving the song down two or three semitones can put it in a comfortable range, and moving it up can lift a part that feels too low. That works for practice tracks and backing tracks alike.
Instrumentalists use it to play along with recordings in an awkward key, and guitarists to skip the capo. DJs and producers use it to match two songs for a mashup or a mix: find each track’s key with the Key & BPM Finder, see how they relate on the Camelot Wheel, then transpose one to fit. If you publish an edit of someone else’s track, that generally needs permission from the rights holders; for practice and personal listening it is a different matter.
How far you can shift before it sounds off
Instruments tolerate a lot. Piano, guitar, synths, and strings usually sound fine a few semitones either way, and many hold up across a wider range. Voices are less forgiving, because the resonances that make a voice sound like a particular person, called formants, move along with the pitch. Much beyond three or four semitones up, singers start to sound small and chipmunk-like; a few semitones down, they turn boomy and heavy.
For vocals, stay within two or three semitones when you can. For instrumentals, you can usually go further. Export WAV if you plan to keep working on the result.
Transpose Audio or the Pitch Changer?
This page does one job cleanly: shift the key by whole semitones and keep the tempo. The full Pitch Changer / Varispeed tool gives you more control, including live preview while you adjust, steps smaller than a semitone, and changing speed and pitch together in one pass.
Transpose audio: common questions
Can I change the pitch of a song without changing the speed?
Yes, that is exactly what this tool does. It moves the song into a new key and then corrects the timing, so the tempo and length stay the same.
How many semitones should I transpose to fit my voice?
Two or three semitones is often enough to bring a chorus into a comfortable range. Move down if the high notes strain, and up if the low notes feel buried.
Is my file uploaded to a server?
No. The processing runs in your browser with FFmpeg compiled to WebAssembly, so the file never leaves your device. We never see it.
Why does the singer sound strange after a big shift?
Voices carry resonances called formants that move with the pitch. Shift far enough and the voice sounds smaller or heavier than the real singer. Keep vocal shifts to a few semitones for natural results.
What key will my song end up in?
Each semitone moves the key one step. A song in A minor moved down 2 semitones ends up in G minor, and moved up 3 it ends up in C minor. The Key & BPM Finder can tell you the starting key.
Can I transpose by a full octave?
Yes, up to 12 semitones either way. An octave keeps the same key name one register higher or lower. It is a big jump, and it usually sounds more natural on instruments than on voices.
What files can I use?
MP3, WAV, M4A, FLAC, OGG, and AAC go in. You get MP3 at 320 kbps or lossless WAV out.
Is it free?
Yes. No sign-up, no watermark, and no cap on how many songs you transpose.
Who makes this?
We're the small team behind Xport Studio, a private, fully offline app for AI vocals, stems, and mastering. These free tools run on the same idea: your audio stays on your device. If you're curious about the bigger thing, take a look.