Audio BPM Changer, Key Finder and Pitch Shifter
Need a track faster, slower, or in a different key? This audio BPM changer, key finder, and pitch shifter lives in your browser on aisong.lol. Upload a file, read its tempo and key, then change the BPM or shift the pitch and download the result. Three small utilities for producers, DJs, singers, and anyone practicing along to a song.
Audio BPM changer, key finder and pitch shifter at a glance
Three jobs, one page. Pick the one you need and skip the rest.
- BPM changer: speed a track up or slow it down without the chipmunk effect.
- Key finder: upload audio and get its estimated musical key and tempo.
- Pitch shifter: move a track up or down in semitones.
- Works in the browser, no download required.
Audio key finder: what key is this song in?
The audio key finder listens to your file and returns its likely key, like A minor or E flat major, plus an estimated BPM. That is handy before you sample a loop, write a topline, or mix two songs back to back.
Key detection is an estimate. Songs that change key, sit on one chord, or lean on drums can read as a neighbor key. If the result sounds off, check the relative major or minor first.
- Producers: match a sample to your project key.
- DJs: plan harmonic mixes between tracks.
- Singers: know the original key before you transpose it.
How to change BPM of a song online
Tempo first, then listen. It takes three steps.
1. Upload your track
Drop in a file you own or have rights to use. Upload a common audio file like MP3 or WAV; the uploader shows size and length limits.
2. Set the new tempo
Type a target BPM or drag a percentage. Small moves of 5 to 10 percent usually sound the most natural.
3. Preview and download
Play it back, nudge it if needed, then export.
Audio shifter: change pitch without changing speed
The audio shifter moves every note up or down while the tempo stays put. Shift up two semitones to make a song easier to sing over, or down to fit a lower voice or a tuned-down guitar.
Big jumps can sound unnatural, especially on vocals. Stick to a few semitones for the cleanest result. Need fine tuning in cents? Whole semitone steps are the safe bet.
Vocal remover pitch changer combo
Want to practice over a song in your own key? Run the track through the vocal remover first, then shift the instrumental here. A vocal remover pitch changer combo gives you a clean backing track in the key you actually sing in. If you want a full sing-along file, the karaoke backing track maker handles that job end to end.
Who uses BPM, key, and pitch tools
If you make or play music, you will hit one of these sooner or later.
- Producers matching loops and samples to a session
- DJs lining up tempos and keys for smooth transitions
- Musicians slowing down a solo to learn it by ear
- Singers moving a song into a comfortable range
- Creators fitting a track to the length or energy of a video
Tips for clean tempo and pitch changes
A few habits keep your audio sounding like music, not a robot.
- Start from the best quality file you have. Compressed files get crunchy faster.
- Change tempo and pitch in small steps and listen after each one.
- Check the key result by humming or playing the root note over the track.
- Drums handle tempo changes well. Sustained vocals and pads show artifacts first.
- Want the TikTok sped-up sound with raised pitch on purpose? Use the sped-up song maker instead.
Free, formats, and your files
These are free audio tools for producers. Free use comes with a free account, and plan details are on the pricing page.
See the privacy policy for how uploads are stored. Only upload audio you own or have permission to edit. Changing tempo or key does not change who owns the song.
Related tools
Make a brand new track with the AI song generator. Pull vocals out with the vocal remover. Build a sing-along file with the karaoke backing track maker. Want the nightcore or sped-up sound? Try the sped-up song maker. Need separate drums, bass, and vocals? Use the stem splitter.
Who this is not for
This page changes tempo, reads key, and shifts pitch. It does not give written feedback on your song, so it is not a song review or critique tool. It is not a full DAW with time-stretch markers or per-note pitch correction, and it is not autotune for live vocals. If you need studio-grade warping on a stem by stem basis, a desktop DAW is still the right call.