Pitch Changer: Change the Key of a Song

Lower the key of a song so you can sing it

A song is usually written for its singer's voice: too high for a low voice, too low for a high one. Lowering the key by two or three semitones is often enough to make a chorus comfortable, without changing the feel of the song, since the tempo stays the same. For a male voice singing a song written for a female singer, go down 4 to 7 semitones, or even a full octave (−12); for a female voice covering a male singer, go up by the same amount. It works just like the "Key" button on a karaoke machine: the tool transposes an instrumental or karaoke track you've downloaded, a backing track for an audition, a talent show or a choir, or any song you're working on. Listen to the preview, adjust by a semitone if needed, then download the version that fits your vocal range.

Semitones and whole steps: how to transpose music

A semitone, or half step, is the smallest interval in Western music: the distance between two neighboring keys on a piano, black keys included, or between two frets on a guitar. A whole step equals two semitones, and twelve semitones make an octave. Transposing by +2 therefore raises the song by a whole step: a song in C major moves to D major. At −5, a song in E moves to B; at +12 or −12, the melody stays the same but an octave higher or lower. Guitarists use it too: many rock bands tune down a half step (to E♭); raise the recording by +1 semitone and you can play along in standard tuning, checked with the "Guitar Tuner".

Slow down a song without changing the pitch

To learn a solo, catch fast lyrics or rehearse a dance routine, slowing a song down helps a lot, as long as the notes stay in tune. The speed setting does exactly that: from 0.5× (half speed) to 2× (double speed), the key stays the original one. Combine both settings if needed: for example 0.75× and −2 semitones to play a song more slowly in an easier key. The new length is shown before you save. The sound is recalculated by FFmpeg, with a very slight processing effect at extreme settings (±12 semitones, 0.5× or 2×); between −5 and +5 semitones, the difference from the original is subtle. For a video, use "Change Video Speed" instead if you only want to change its speed.

An online pitch shifter, for audio and video

This tool is a pitch shifter that works in your browser, on a computer or a phone, with no software like Audacity and no app to install. It accepts common audio files (MP3, M4A, WAV, OGG, FLAC) and videos (MP4, MOV, WebM): from a video, you can keep the picture as an MP4 with the sound transposed, or extract only the sound as an MP3 or WAV. With the speed unchanged, the picture is simply copied and saving is fast; if you change the speed, the picture is recalculated to stay in sync. The file is never sent over the internet: everything is processed on your device by FFmpeg, downloaded only once (about 30 MB). To keep only part of the song, trim it afterwards with the "MP3 Cutter".