Key Transposer
Upload your audio, choose how many semitones to move it, and download the result at the same tempo.
MP3, WAV, M4A, FLAC · up to 50 MB
Transposing without speeding the song up
Changing pitch by speeding audio up is the old trick, and everyone hears it. Here it happens in two stages: the audio is first time-stretched with a waveform-similarity overlap algorithm and then resampled, so the final duration is identical to the original and only the pitch moves.
One semitone is the distance between two adjacent piano keys. Twelve semitones make a full octave.
How far the quality holds
Between one and five semitones the result is clean and demo-ready. Beyond that, and especially near twelve semitones, artefacts become audible — a real limitation of any real-time transposition, not a flaw of this tool. We would rather tell you than let you find out.
Frequently asked questions
Is the duration preserved exactly?
Yes. The output file has the same length as the original.
What format do I get?
Lossless WAV, so the audio is not degraded twice.
What is the size limit?
50 MB, because the whole process runs in your browser's memory.
Can I transpose vocals alone?
Yes, and vocals usually hold up well up to three or four semitones.