Best Pitch Changers (2026): 9 Tools to Change a Song's Key

Type 'pitch changer' into a search bar and you'll get three kinds of tool back, all wearing the same label. Some are apps musicians use to slow a song down without moving its key. Some are browser pages that raise or lower a track by a few semitones. And two of them aren't apps at all, but code libraries for developers.

This list covers nine of them, using only what each maker's own website says, read on 2 Nov 2026 (as of Nov 2026). It's alphabetical and in no particular order, and it sticks to changing the pitch or key of music, not changing your voice.

Pitch and key changers compared by type

Tool	Type	Good for
Amazing Slow Downer	Slow-down software for musicians	Slowing music down while keeping the pitch
Anytune	Music player app for musicians	Slowing a song down and choosing its pitch
Audioalter	Browser audio effects toolkit	A pitch shifter beside a tempo changer and more
Capo	Song-learning app for Mac, iPhone and iPad	Seeing a song's beats, chords and key
PitchChanger	Online pitch and key changer	Raising or lowering a song's key in a browser
Rubber Band Library	C++ library for developers	Time-stretching and pitch-shifting inside your own app
Song Surgeon	Slow-down and key change app	Changing a song's speed and key on Mac and Windows
SoundTouch	Open-source audio processing library	Changing tempo, pitch and playback rate in code
Vocal Remover Key and BPM Finder	Browser key and BPM finder	Finding a song's key, then transposing it

Nine pitch changers, one line each

Amazing Slow Downer

Best for: Musicians on Mac or Windows who want to slow music down without changing the pitch, so they can transcribe what they hear.

Anytune

Best for: Learning and practising songs by ear, with a set of tools for slowing music down, on Apple devices and Android.

Audioalter

Best for: Changing the pitch of your audio in a browser, with a tempo changer, a BPM detector and a 440 Hz to 432 Hz converter on the same site.

Capo

Best for: Working out songs without tabs or sheet music by analysing tracks in your own library, and it works with audio files you own.

PitchChanger

Best for: Moving a song up or down by semitones in your browser without changing its speed, then saving the new version as MP3 or WAV.

Rubber Band Library

Best for: Developers building apps that change tempo and pitch independently of one another, with a command-line utility for existing audio files too.

Song Surgeon

Best for: Getting key, beat, note and chord detection alongside speed and key changes in one desktop app.

SoundTouch

Best for: Programmers who need tempo and pitch control in their own sound tools, from a library that can also estimate BPM.

Vocal Remover Key and BPM Finder

Best for: Finding a song's key, scale and BPM first, then transposing it to a different key and tempo with the site's pitch shifter tool.

Three jobs hiding behind one search term

Here's the split you wouldn't guess: 'pitch changer' covers three different jobs, and the tools on these pages differ by job more than by feature list.

• Learning a song by ear: slow the track down so you can hear each note, while the key stays the same.
• Moving a song to a singer's key: raise or lower the whole track by a few semitones and keep its speed.
• Building pitch shifting into software: add tempo and pitch control to an app you're writing.

Anytune's own page puts the first job plainly: 'slow it down, choose the perfect pitch'. Amazing Slow Downer comes at it from the other side, describing software intended for musicians who want to 'slow down music without changing the pitch'.

Turn a recording into MIDI first if you'd like to see which notes you're shifting.

Tempo, pitch and playback rate, in one maker's words

Before you choose, it helps to know which control you're after. SoundTouch's page splits them three ways. Tempo plays the sound faster or slower without affecting the pitch. Pitch changes the key while keeping the original tempo. And playback rate changes both together, 'as if a vinyl disc was played at different RPM rate'.

So if you only want a song lower for your voice, you're after the pitch control alone. If you're learning a fast solo, it's tempo. And if you want the old record-player effect, it's playback rate.

Running a pitch tool inside another program usually needs one of the virtual audio cables.

Browser key changers for a quick transpose

For a one-off key change, three of the tools here run in a browser. PitchChanger offers to 'change the pitch or key of any song online', and its page suggests common key changes: down two semitones when a chorus is too high to sing, or up one semitone to play along in standard tuning with a record tuned half a step down.

Another browser site lists its pitch shifter beside a tempo changer, reverb and a BPM detector. A third starts with a key and BPM finder, then sends you to a pitch shifter to transpose the song. That order makes sense if you don't know the song's key yet.

Desktop apps for learning songs by ear

If you practise along with recordings, the slow-down apps are the ones to look at. Capo's page says it analyses any song in your music library 'to reveal its beats, chords, and key', so you can learn songs without tabs or sheet music. Song Surgeon calls itself an 'audio slow down and key change app' for Mac and Windows, and its version 6 adds key, beat, note and chord detection.

Those detection tools matter when you're working out a part by ear: seeing the key and chords on screen saves you guessing them.

Pitch-shifting libraries for developers

Two entries aren't apps you open: they're libraries for people writing software. Rubber Band describes a library for 'audio time-stretching and pitch-shifting', a C++ library intended for developers creating their own application programs, and its page says it's open source software under the GNU General Public License. The other is an open-source library that, its page says, supports Windows, Mac OS, Linux, Android and Apple iOS.

Both also ship a command-line utility, so you can try a pitch change on an audio file before you write a line of code.

Questions to settle before you change a key

• Am I learning a song, moving it for a singer, or building an app?
• Do I need to slow the track down, change its key, or both?
• Do I know the song's current key, or do I need a key finder first?
• Would I rather work in a browser or a desktop app?
• Which system am I on: Mac, Windows, iPhone, iPad or Android?
• Do I need to save the changed track as a new file?

Do you make a pitch changer or a key changer app? Tool makers can ask to be considered for a featured place on this list.

My advice on choosing a pitch changer

Start with the job, not the feature list. If you're learning parts by ear, choose a slow-down app that keeps the key and shows you what's going on in the song. If you just need a track lower for a singer, a browser key changer is the quickest route. And if you're writing software, go straight to the two libraries and their command-line tools.

If you're making your own music, my guide on how to make songs with AI is a good next step, and for video work, here's where to find background music for Reels.

Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.

Frequently asked questions

Can I change a song's key without changing its speed?

Yes. One browser tool here says it raises or lowers the key of any song without changing its speed, and an open-source library describes a pitch control that changes the key while keeping the original tempo.

Can I slow a song down without changing the pitch?

Yes, that's the main job of several tools on this list. One maker describes its software as intended for musicians who want to slow down music without changing the pitch, and a music player app for musicians tells you to slow it down and choose the perfect pitch.

Which of these pitch changers run in a browser?

Three do: an online pitch and key changer, an audio effects site with a pitch shifter, and a key and BPM finder that sends you to a pitch shifter to transpose the song. The others are desktop or mobile apps, or libraries for developers.

Which of these work on Mac and Windows?

Two makers here say their slow-down apps are available for Mac and Windows. Another is a song-learning app for Mac, iPhone and iPad, and one music player app has versions for Apple devices and Android.

How do I find a song's key before I change it?

Use a key finder. One tool here analyses music and finds the key, scale and BPM for any song, a browser pitch changer shows a song's key and BPM when you open it, and one desktop app added key detection in its version 6.

Can developers add pitch shifting to their own apps?

Yes. Two entries are libraries rather than apps: a C++ library for audio time-stretching and pitch-shifting that can be integrated into apps for any desktop or mobile platform, and an open-source library for changing tempo, pitch and playback rate.