Change a song's key without changing the speed
You can transpose a song up or down by as much as 12 semitones while the tempo stays exactly where it was, so a track that sits a third too high for your voice becomes singable. StemConsole does it in the browser with no install: upload the song, separate the vocal from the band, and shift the key of the backing while you sing or play over it.
Splitting is free and the first split needs no account. Key change is a Pro tool you can try on the demo song first.
How to change the key of a song
- 1
Upload a song
Drop an MP3, WAV, FLAC or M4A (up to 200MB) at stemconsole.ai. The first split needs no account.
- 2
Split it
Vocal Remover (free) gives vocals and instrumental. Quick Split (free) also separates drums, bass and other.
- 3
Open the practice controls
Mute the vocal stem, or leave it low as a guide for the first passes, and find Pitch under the mixer.
- 4
Set the new key
Move Pitch by semitones, up to 12 either way. Speed does not move. Sing the chorus and adjust one semitone at a time until the top note sits comfortably.
- 5
Fine-tune
If the song is also too fast, slow it with Speed; the controls are independent. Loop the chorus while you test keys.
- 6
Export
Bounce your mix to MP3 free; a bounce in the new key, or in WAV, is Pro. Save the session so the key is remembered.
How to find the right key
Find the highest note in the song, usually in the last chorus, and sing it. If it is a strain, count how many semitones you need to come down until it sits inside your comfortable range, then shift by that amount. Most singers land within two to four semitones; if you need more than five, try singing the melody an octave lower instead.
Guitarists use the same control the other way. Many classic recordings were tracked a half step down, so shifting the song up one semitone lets you play along in standard tuning. Shift down two for a whole-step-down tuning, or down one to skip a capo.
Small shifts sound natural. Beyond about four semitones the bass turns flabby going down and thin going up. The vocal stem sounds odd when shifted, which is another reason to mute it and sing.
What to expect
Drums come through cleanly because they are mostly unpitched, but sustained instruments pick up a light chorus-like texture as the shift grows, and reverb tails move with it. Keep the change as small as your voice allows and check the result on headphones before recording over it.
What is free and what is Pro
| Free | Pro | |
|---|---|---|
| Change key | No | Yes, 12 semitones either way |
| Slow down | No | 50% to 150%, pitch locked |
| Stems | Vocal Remover and 4-stem Quick Split | 6-stem Full Separation (adds guitar and piano) |
| Looping | One A/B loop (free account) | Named loops, count-in, tap tempo |
| Downloads | MP3 stems and MP3 mix bounces | WAV stems and bounces, including at a changed speed or key |
| Splits | 5 a month (2 multi-stem); first needs no account | 100 a month, then 15 a day |
Pro is US$6.99 a month or US$49 a year. A US$1.99 credit buys one Full Separation, no practice tools, never expires. See plans.
Frequently asked questions
Does changing the key change the speed?
No. Pitch and Speed are independent, so you can transpose down three semitones at the exact original tempo, or change both at once.
Can I change the key of an MP3?
Yes. MP3, WAV, FLAC, M4A, OGG and AAC up to 200MB. Higher bitrates separate more cleanly.
How far can I transpose?
Twelve semitones up or down. One to four sounds natural; beyond six is best kept for working out parts rather than performing over.
Can I save the transposed song?
Bounce mix exports your balance to MP3 free; a bounce in the transposed key, or in WAV, is Pro. Saved sessions also remember the pitch setting.
Is it free?
Splitting the vocal from the band is free, with 5 splits a month. Key change is in Pro, US$6.99 a month or US$49 a year.
Does it work on a phone?
Yes, in the mobile browser with nothing to install. Use headphones so you can hear the detail.
Compared with Audacity and Moises
| Audacity | Moises | StemConsole | |
|---|---|---|---|
| Key change without speed change | Yes, offline render | Yes, on the Premium plan | Yes, live, 12 semitones (Pro) |
| Mute the vocal first | Centre-channel reduction only | Yes, stems | Yes, stems |
| Hear the change instantly | No, apply and listen | Yes | Yes |
| Runs in the browser | No, desktop install | Web and mobile app | Yes, no install |
| Cost | Free | Premium subscription; price shown after login | Free split; Pro US$6.99 a month |
Related guides and tools
Slow down a song without changing pitch
Learn fast passages at a comfortable speed without changing the key (Pro).
Loop a section of a song
Repeat a phrase until it sits under your fingers. Basic looping is free; named loops need Pro.
Create a backing track
Set each stem’s level, then bounce the mix: MP3 free, WAV with Pro.
Karaoke maker
Turn any song into a karaoke-ready instrumental in minutes.
Vocal remover
Strip the vocal from any track: clean instrumental plus isolated vocal.
How to make a karaoke track from any song
From the blog. Remove the lead vocal, keep the music, and check the result.
Written by Dan Murtagh, mixing engineer and audio educator. Updated 13 September 2026.