Drop a song and shift the key in semitones or slow it down / speed it up — independently, so you can change pitch without the chipmunk effect. Everything runs in your browser; nothing is uploaded.
📖 Read the full guides: Speed up or slow down audio → · How to change a song's key for singing →
Yes — completely free, with no sign-up, no watermarks, and no limit on how many files you process.
Yes. Pitch and tempo are handled independently with time-stretching, so you can transpose the key without the "chipmunk" effect, or slow a song down without dropping its pitch.
No. Decoding and processing happen locally in your browser, so your audio never leaves your device.
Transpose a song to a singable key, make a karaoke/practice track, slow a passage down to learn it, or speed up a recording — then download the result.
Whatever your browser can decode — MP3 and WAV work everywhere, with M4A, OGG and FLAC where supported. The result is saved as MP3 or WAV.