Why does a large shift sound smeared?

Because the pitch has to be rebuilt from grains of the original audio. Small changes overlap grains that are still very similar, while large ones have to repeat and blend portions that no longer match, and the result is a loss of transient sharpness. It is a property of time-domain stretching, not a setting that can be tuned away.

Is the timing really untouched?

Yes. The stretch stage is driven by exactly the factor the resample stage used, so the two cancel in duration terms. The output length equals the input length to the sample, which means a shifted file lines up with the original if both are placed at the same start point.

What does the cents control do that whole semitones cannot?

It moves the pitch by hundredths of a semitone, which is the range you need to fix a recording made slightly off pitch or to meet another instrument exactly. Fifty cents is half a semitone in each direction, so the fine-tune and the interval sliders overlap only at the extremes of taste.

Can I shift only part of a file?

The whole file is shifted in one pass, so a single interval applies throughout. To shift one section only, keep that section with the trimmer, shift it, then join it back into place with the joiner.

Does the shift change the stereo image?

No. Both channels are shifted by the same factor and the same method, so the relative timing between them is unchanged and the image stays where it was. The tool accepts up to two channels and leaves anything wider alone.

Audio Pitch Shifter

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Musical Transpose Tool

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Audio Pitch Shifter changes the pitch of a recording while leaving its length exactly as it was. The interval is chosen in semitones with a fine-tune in cents, so a song can be moved into a comfortable key without altering its tempo at all.

What is Audio Pitch Shifter?

Set the interval, drop a file, and process. The result is a WAV of exactly the same duration as the source, with the pitch moved by the chosen amount.

The controls:

A semitone slider from twelve down to twelve up, defaulting to plus two.
A fine-tune slider in cents from minus fifty to plus fifty, defaulting to zero, which gives hundredth-of-a-semitone precision.
A report line giving the combined shift, the multiplier it produces, where a reference pitch of 440 Hz lands after the shift, and confirmation that the length has not moved.

The shift is built from two operations applied one after the other, and knowing why matters. The signal is first resampled by the frequency ratio derived from the interval, which raises the pitch by exactly that factor and shortens the file by the same amount. It is then stretched back by that same factor, which restores the original duration without moving the pitch down again. Because the second stage undoes precisely the length change the first one made, the output duration matches the input to the sample, which is the property that separates this tool from a tape-style speed change. A shift of twelve semitones is a factor of two, and the cents control contributes a hundredth of a semitone on top of whatever the interval gives. The stretch stage is a windowed overlap-add method that searches for the position at which each grain best continues the audio already written, which is what stops a shifted tone from sounding watery. The weakness is the one every time-domain method shares: small shifts leave the material sounding much as it did, while large ones blur transients and can leave a dense mix slightly smeared. Up to about three semitones is usually transparent, and a full octave is where the artefacts start to become a matter of taste rather than something you stop noticing.

What to expect and what not to:

The duration is preserved exactly, so nothing has to be re-cut afterwards.
Up to two channels are handled, so a stereo file keeps its image.
Large shifts smear transients, which is inherent to stretching rather than a defect of this implementation.
No formant handling, so a heavily shifted voice sounds a little larger or smaller as well as higher or lower.
One fixed interval applies to the whole file, with no change over time.
The output is sixteen bit WAV whatever the source was.

Use it for the jobs a pitch change solves: moving a track into a key a singer can reach, tuning a recording that was made at the wrong reference, building a harmony from a shifted copy, or matching a sample to the material around it. When only the duration should change, the time stretcher and tempo changer keep the pitch where it is, and when a single note needs correcting inside a performance rather than a whole file being moved, pitch correction works note by note instead. The interval is stated in semitones because that is the unit musicians already think in, and the cents control covers the fraction of a semitone that matching an existing recording often needs.

How to use Audio Pitch Shifter

Drop an audio file onto the panel and wait for it to decode.
Choose the interval in semitones, using the fine-tune in cents for smaller corrections.
Check the reported multiplier and the note the reference pitch lands on.
Press process, compare the previews, and download the shifted WAV.

When to use Audio Pitch Shifter vs related tools

Audio Pitch Shifter is the tool when the pitch must move and the timing must not, which makes it the choice for key changes and reference tuning. Tempo Changer and Time Stretcher change duration with the pitch held instead, and Audio Speed Changer offers both behaviours from one control if you have not yet decided which you need. To transpose written material rather than recorded audio, Musical Transpose Tool works in note names.

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