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Change a Song's Key Without Changing Its Speed

Move the pitch up or down by up to 12 semitones, keep the tempo locked in place or let it slide like a turntable, and export as MP3, WAV or M4A. Nothing leaves your browser to do it.

Runs locally with Signalsmith Stretch in your browser. Your track is processed on this device, never on a server.

將音訊檔案拖到呢度

或者㩒一下喺部機揀一個

MP3、WAV、M4A、AAC、OGG、FLAC · 最大 200 MB

How the pitch shift works here

With Keep the Tempo on, the shift runs through Signalsmith Stretch, a phase-vocoder pitch and time engine compiled to WebAssembly. It analyses the audio in short overlapping frames, moves every frequency up or down by the interval you pick and resynthesises the result at the original length, so the song keeps its exact duration and beat.

With Keep the Tempo switched off, nothing is stretched: the audio is simply resampled, the full turntable effect, with pitch and length moving together. That mode is a genuinely different sound, not just a shortcut, and it stays perfectly clean at any shift. Either way, press Play preview and drag the slider to hear the new key before you export.

Choosing a shift for the job

For singing along or karaoke, start with small moves of 1 to 4 semitones toward your comfortable range and listen back before going further; most voices need less correction than people expect. For matching an instrument, count the actual interval: a guitar tuned down a half step needs -1 semitone, a full step down needs -2, and a capo removed needs the shift the capo used to add.

For transposing a backing track into a new key for a band, work out the number of semitones between the old and new key first, since going the wrong direction is an easy mistake, then apply it with Keep the Tempo on so the rest of the arrangement still lines up with a click track or a drummer.

Quality limits and practical notes

Shifts inside roughly plus or minus 5 semitones keep vocals sounding natural, since the formant movement is small enough to pass as a different singer rather than a processed one. Beyond about 7 to 8 semitones, expect an audible thinning or a slightly cartoonish quality on voices, though instruments like guitar, piano and strings tolerate larger shifts more gracefully than a lead vocal does.

Export to WAV if the shifted track is going into another audio editor next, so you are not stacking a second round of MP3 compression on top of the shift. Processing time scales with the length of the source file and the size of the shift, but a typical song still finishes in well under a minute on a modern laptop or phone.

Pitch shift blueprint

The range behind the slider, and what the tempo toggle changes underneath it.

Range-12 to +12 semitones
Default0 semitones, the original pitch, unchanged
Best forSinging in your key, karaoke, matching a detuned guitar, transposing a backing track
Tempo behaviourKeep the Tempo on: length stays fixed. Off: length changes with pitch, turntable-style
Quality noteNatural up to about 5 semitones; noticeable formant thinning past 7 to 8
OutputMP3, WAV or M4A
LimitsUp to 200 MB per file, processed entirely in this browser tab

How to Shift Pitch Online

Three steps, all inside your browser

  1. 01

    Load a track

    Drop in an MP3, WAV, M4A, AAC, OGG or FLAC up to 200 MB. It is read straight from your disk, not sent anywhere.

    Instrumentals and full mixes both shift cleanly; very dense mixes show artifacts sooner than a solo voice.

  2. 02

    Choose the shift

    Drag from -12 to +12 semitones, then switch Keep the Tempo on to hold the length or off for a turntable-style pitch and speed change together.

    Whole numbers match musical steps; -1 or +1 is a half step, the same as a capo or a detuned guitar.

  3. 03

    Check it and save

    Listen back at the new pitch, then export as MP3, WAV or M4A.

    Try a couple of nearby semitone values before committing; the best-sounding shift for singing is rarely the biggest one.

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Frequently Asked Questions

Everything about shifting pitch in the browser

No. Signalsmith Stretch, compiled to WebAssembly, runs the whole shift inside the browser tab you have open, and FFmpeg.wasm only encodes MP3 or M4A at the end. The audio file never travels to a server.
MP3, WAV, M4A, AAC, OGG and FLAC up to 200 MB go in. The shifted result saves out as MP3, WAV or M4A.
A small shift of a few semitones is close to transparent. Push past about 7 semitones and voices start to pick up a hollow, chipmunk-like or robotic character, because the formants, the resonances that make a voice sound human, move along with the pitch instead of staying put.
With Keep the Tempo on, the pitch moves while the song's length stays exactly the same. Turn it off and the tool behaves like a turntable playing at the wrong speed, so pitch and length change together and a higher pitch also means a shorter track.
Singers move a backing track into a comfortable range, karaoke fans nudge a song to match their voice, guitarists shift a track down a half step to match a drop tuning, and producers transpose a sample before dropping it into a new arrangement.
You can get that here with Keep the Tempo turned off, but if you specifically want the tape-style sound with a fixed, genre-typical speed range, the Slowed + Reverb Maker or Nightcore Maker pages are built around exactly that effect.

Other one-click audio effects

The same in-browser engine, each page tuned to a single, specific change.

Want a whole new backing track instead of a shifted one? AI 音樂生成器

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