What a pitch changer actually does
Pitch is how high or low a note sounds. Tempo is how fast the music moves. On a record player or a plain tape machine those two are glued together: spin the platter faster and everything gets quicker and higher at the same time. Digital tools can pull them apart, and that is the whole point of a modern pitch changer. You can move the key without touching the tempo, move the tempo without touching the key, or change both on purpose.
TuneSplit's pitch and speed changer gives you two separate controls for that. The Pitch slider moves the song up or down in semitones, from -12 to +12, which is a full octave in either direction. The Speed slider plays the same audio between 50% and 150% of its original rate. When you change speed, the pitch is kept where it was, so a slowed-down chorus still sounds like the same singer in the same key, just unhurried.
A semitone is the smallest step on a piano keyboard, from one key to the very next one, black or white. Twelve semitones make an octave. If a song is in C major and you move it up two semitones, it is now in D major. Nothing about the chord shapes changes; every note is simply shifted by the same distance, so the melody and harmony stay in tune with each other.
Semitones and key changes: the quick reference table
Musicians talk about key changes in two ways: by letter name (from C to D) and by number of half steps (up two). The table below ties the two together. The third column uses C major as the starting point because it is the easiest key to read, but the same math works from any key: count the semitones up the chromatic scale and you land on the new tonic.
| Slider setting | Interval | C major becomes | Typical use |
|---|---|---|---|
| -12 | Down one octave | C major (octave lower) | Bass-heavy remix idea, very deep vocal effect |
| -7 | Down a perfect fifth | F major | Bring a high lead vocal well into range |
| -5 | Down a perfect fourth | G major (lower octave) | Lower a belted chorus for a quieter performer |
| -3 | Down a minor third | A major | Gentler key for a singer who is tired or warming up |
| -2 | Down a whole tone | B-flat major | Common step down when a chorus strains the voice |
| -1 | Down a semitone | B major | Subtle fix, or match a detuned instrument |
| 0 | Original | C major | No change |
| +1 | Up a semitone | C-sharp major | Brighter feel, or match another track by one step |
| +2 | Up a whole tone | D major | Lift for a lower voice, or a classic final-chorus modulation |
| +3 | Up a minor third | E-flat major | Bigger lift, still natural sounding on most material |
| +5 | Up a perfect fourth | F major | Move a baritone-range song into a tenor range |
| +7 | Up a perfect fifth | G major | Closely related key, handy for mashups |
| +12 | Up one octave | C major (octave higher) | Extreme effect, chipmunk-style vocals |
Changing speed without changing pitch (and the reverse)
The speed control works as a percentage of the original tempo. At 100% nothing changes. At 75% the track plays three quarters as fast, and at 125% it plays a quarter faster. The pitch does not follow, so you can work on a hard riff at a reduced tempo and still hear the real notes in the real key.
The quick chips for speed are 75%, 90%, 110% and 125%. Those cover most real situations: 75% for slowing a hard passage down for practice, 90% for gentle slowdowns, 110% to tighten a loose feel, and 125% for quickly skimming a backing track. If you need an exact tempo, work out the percentage from the BPM numbers: new speed equals target BPM divided by original BPM. A 100 BPM track at 90% plays at 90 BPM, and a 120 BPM track at 125% plays at 150 BPM.
If you do not know the BPM of your file, run it through the BPM and key finder first. That tool works out the tempo and the musical key without uploading the file anywhere, and it reports half-time and double-time alternatives, which helps when a tempo feels ambiguous. Then come back here with the numbers in hand.
Who uses a pitch and speed changer
People reach for this kind of tool for a handful of very ordinary reasons. Here are the ones that come up most often.
- Singers fitting a backing track. If a karaoke or instrumental track sits a little too high, drop it one to three semitones and sing along comfortably. If it sits too low, nudge it up. This is the single most common reason to change key.
- Instrumentalists learning a part. Slow the speed to 75% or 50% to hear every note of a fast guitar or piano line, and keep the pitch where it is so you can play along on your real instrument without retuning.
- Choirs and teachers. Shift a practice recording into a range the group can reach, or create slower rehearsal versions of a difficult passage for each voice part.
- DJs and mashup makers. Match the key of two tracks by moving one by a semitone or two, and use the tempo percentage to line up the beat before mixing in your own software.
- Dancers and fitness instructors. Make a favorite track a little slower for a warm-up or a little faster for a finisher, without turning the singer into a cartoon.
- Video creators. Pitch or speed a clip of audio for a slowed-and-reverb or sped-up effect, or fix a clip recorded a touch flat.
- Transcribers and songwriters. Lower the pitch to hear bass notes more clearly, or raise the pitch to check whether a melody works better in a different key.
Hear the difference on real audio
These are real songs we generated with TuneSplit while building the site. They are unedited and make good test material for the sliders. The lo-fi track is a clean, instrumental sound, which makes pitch moves easy to hear. The indie pop track has a lead vocal, which shows what a shift of one or two semitones does to a singer.
The lo-fi instrumental came from the prompt 'lofi hip hop, chill, rhodes piano, vinyl crackle, instrumental' and was produced by the ACE-Step model in about 11 seconds. Sunlight came from an indie pop prompt with a bright female vocal, was made by MiniMax Music v2, runs 2:30 and took about 94 seconds. If you want to try the pitch changer on your own version of a song, the same prompt in the song generator returns two versions from two different models, so you can compare how each handles a shift.
How it compares with other ways to change a key
Plenty of search results for this topic are articles that explain pitch in theory and then send you elsewhere to do it. Here is how the usual routes stack up for a one-off job. We are not tracking competitor prices for this category; the comparison is about the approach.
| Approach | Setup | Pitch control | Speed control | Best for |
|---|---|---|---|---|
| TuneSplit pitch changer | None, open in a browser | -12 to +12 semitones | 50% to 150%, pitch kept | Quick key or tempo change, WAV download |
| Digital audio workstation | Install and learn a project workflow | Fine control, cents and formants in many apps | Full time-stretch tools | Long projects with many tracks |
| Phone music app | App install, sometimes a subscription | Often a few semitones | Often a few preset speeds | Practicing along to a song on the go |
| Transposing by ear or by hand | None | Whatever your instrument can reach | Your own playing | Live playing where no audio file is needed |
A DAW is the better choice if you need studio-grade formant control on a lead vocal or you are building a full mix. A browser tool wins when you simply want an answer in a minute: move the slider, listen, download. Be realistic about what any pitch shifter can do. Large shifts introduce audible artifacts, especially on vocals, because the engine has to rebuild the sound after moving it. Keep moves modest for the most natural results.
Quality, limits, and what to expect
Pitch shifting rebuilds audio rather than simply replaying it. That is why small moves sound clean and large moves can sound processed. As a rule of thumb, stay within three semitones for natural-sounding vocals and within five for most instruments. For effects, go as far as you like, up to the full -12 to +12 range.
Only upload audio you own or have permission to use. The tool is for practice, editing and creative work on material you have the rights to. It does not clone voices or recreate a real singer's voice, and it will not make a pitch-shifted copy something you are allowed to publish if you were not allowed to publish the original.
Related free tools on TuneSplit
Pitch and tempo are only two parts of working with a track. The other free tools cover the rest of the job and are designed to be used together.
- BPM and key finder. Find the tempo, musical key, and Camelot code of any file, right in the browser. Use it before you shift a song, to know where you start, and after, to confirm where you landed.
- Vocal remover and stem splitter. Split a song into vocals and music, or into vocals, drums, bass and other, then change the pitch of just the instrumental for a karaoke version in your own key.
- AI song generator. Describe a song, get two versions from two different models, and shift either one into the key you need.
- Lyric video maker. Turn the pitched track into a vertical or widescreen MP4 with timed lyrics for social media.
Frequently asked questions
Is the pitch changer really free?
Yes. You can change pitch, change speed, preview the result and download a WAV without paying. The tool runs in your browser, so there is no upload queue or file-size wait. Other TuneSplit features, such as the vocal remover and song generator, have their own free daily limits, but this one is simply open to use.
How many semitones can I shift a song?
The pitch slider covers -12 to +12 semitones, which is one full octave down or up. There are also quick chips for -2, -1, +1 and +2 keys, because those are the moves people make most often. Smaller shifts of one to three semitones tend to sound the most natural, especially on a vocal.
Can I change the speed without changing the pitch?
Yes. The speed slider runs from 50% to 150% and keeps the pitch where you set it, so a track played at 75% is slower but still in the same key. Pitch and speed are independent controls, and you can set both at once if you want, for example to make a slowed-down version in a lower key.
How do I convert semitones to a key change?
Count half steps up the chromatic scale from the original key. Up one semitone from C is C-sharp, up two is D, up three is E-flat, up five is F, and up seven is G. Going down works the same way in reverse. The table on this page lists the common moves, and the BPM and key finder can confirm the result after you download.
Does pitch shifting reduce audio quality?
A little, and more the further you go. Small changes of one to three semitones are usually hard to notice. Larger moves can add a processed or robotic character, particularly on vocals, because the sound has to be rebuilt after it is moved. The downloaded WAV adds no extra compression, so any loss comes from the shift itself and your original file.
What file types can I use, and what do I get back?
Add common audio files such as MP3 or WAV. The tool lets you preview the result in your browser and download it as a WAV file. WAV is uncompressed, so it keeps the processed audio intact, and you can convert it to MP3 in any audio editor if you need a smaller size for sharing.
Does it work on iPhone and Android?
It is a web tool, so it works in a modern mobile browser without an app install. Add your file from the phone, move the sliders and listen. Very long files can be slower on older phones because the processing happens on the device itself, so a laptop is the better choice for big projects.
Is my audio uploaded anywhere?
The pitch and speed changer runs in your browser, so the processing happens on your own device rather than on a server queue. You only download the result you choose to save. As always, use audio you own or have permission to edit, and keep in mind that other TuneSplit tools, such as the stem splitter, work differently and have their own privacy notes.
Can I make a slowed and reverb or a sped up version?
You can build the pitch and tempo side of it. Lower the pitch and speed together for a slowed feel, or raise both for a sped-up one, then download the WAV. The reverb itself is not part of this tool, so add that in a separate editor if you want it. Only publish edits of music you have the rights to use.
How do I find the original key of my song?
Use the BPM and key finder. It analyzes your file in the browser, reports the tempo with half-time and double-time alternatives, and gives the musical key with its Camelot code and a runner-up key. Once you know the starting key, the semitone table makes it easy to plan the new one.
Can I change the key of just the vocals or just the instrumental?
Yes, with a two-step workflow. First split the song with the free stem splitter into vocals and music, then bring the part you want to change into the pitch changer. This is a common way to make a karaoke track in a different key. Make sure you have the rights to the song before you split or edit it.