How to Change the Key of a Song Online
Transpose a track up or down without changing its speed. Useful for singers, guitarists with capos, horn players, or anyone practicing by ear.
When You Actually Need to Change a Song's Key
A few common reasons: • The song sits too high or low for your voice — drop it two semitones to match your range • Your instrument is in a different key than the recording — drop a Bb horn part by two semitones to read it in concert pitch (or shift the track up two) • You want to learn a solo in open positions on guitar — transpose the song so the key matches your fretboard comfort zone • The song was recorded in an odd key (say, between F# and G) — nudge it a few cents to line up with standard tuning • You want to practice transposition itself — pick a song you know, shift it to a random key, play along
Step 1: Load the Track
Drop an audio file on the loope uploader. Any common format works — MP3, WAV, FLAC, OGG. The track loads and a waveform appears. Pitch-shifting in loope uses the same time-stretch engine as the speed slider, so the pitch change doesn't affect the length. A 3-minute song transposed up a fourth is still 3 minutes long.
Step 2: Use the Pitch Slider for Semitones
The Pitch slider shifts in semitones from -12 (one octave down) to +12 (one octave up). Each step is a half-step in Western music: • +1 = up a semitone (e.g. C → C#) • +2 = up a whole tone (e.g. C → D) • +7 = up a perfect fifth (e.g. C → G) • +12 = up an octave Move it, hit Play. The whole track transposes instantly.
Change a song's key in loopeStep 3: Use the Fine Tune Slider for Cents
One semitone is divided into 100 cents. The Fine Tune slider lets you nudge by ±50 cents (half a semitone either direction). This matters when: • A song was recorded slightly out of A=440 tuning (historical recordings, purposeful tuning like A=432) • You want to match your own instrument's tuning without retuning • You're producing and matching a sample to a new key A 20–30 cent adjustment is typically enough to lock a track to standard tuning.
Step 4: Export in the Target Key
Once you've dialed in the key, click Export and pick a format. The exported file is the transposed version — ready to play back in any app, load into a DAW, or send to a bandmate. WAV preserves quality perfectly. MP3 is smaller and works everywhere. FLAC is lossless and compressed. OGG is open-source and lossy.
Try it now in Loope
Drop a track. Slow it down. Loop the tricky part. Change the key. All in your browser — no upload, no signup.
Open LoopeRelated Guides
Frequently Asked Questions
Slightly. The time-stretch/pitch-shift algorithm introduces small artifacts — usually inaudible at ±3 semitones, more noticeable at ±7 or beyond. A 50-cent fine-tune adjustment is essentially transparent.
loope doesn't detect key automatically (that feature is on the roadmap). Until then, check the song's Wikipedia page, look it up on SongBPM or Tunebat, or use a free key detector like Mixed In Key's web tool.
Not yet. The pitch slider applies to the entire track. For section-by-section transposition, export a slice of the song first (using the cutter), then transpose the slice.
Octave-up pitch shifts are the hardest case for a time-stretch algorithm — you're asking it to invent high-frequency content that wasn't there before. Small shifts (±3) sound most natural. If you need dramatic octave jumps, consider re-recording rather than pitch-shifting.
A semitone is the smallest step in Western music (C to C#). 100 cents equals one semitone. So +1 semitone = +100 cents, and +50 cents = a quarter-tone.