Song key changer transpose a track, and see where it lands
Transpose a song into a key that fits you. Use it as a key changer mp3, or on WAV, FLAC and M4A alike.
We read the key off your file, shift it by the semitones you pick, and tell you exactly where you land: A minor to B minor, not "+2".
By Sam Ridder · Last updated: September 2026
No account. No watermark. Free for files up to 120 MB.
It's an online song key changer, and a key and BPM changer if you move the tempo slider too. Tracks can be up to 10 minutes, there's no daily cap, and the song key changer free tier is exactly the same as the paid one. It works as a key changer app in any browser, so no separate keychanger app is needed on your phone.
Want to check the key before you commit to a shift? The key finder will find the key of a song online in about two seconds, without changing the file: then come back here and change it by ear.
It names the key, not just the number
Most transposers hand you "+3 semitones" and leave the counting to you. This one measures the key of your upload in the same pass as the shift, so the result says F major → A♭ major. If the audio has no clear tonal centre it says nothing instead of guessing: the same rule as our key finder.
- The key you started in, root note and scale, read off the audio
- The key you land in, after the shift you chose
- The tempo too, before and after, if you also moved the speed
- An MP3 back, and your upload deleted the moment it appears
How to change the key of a song online
- Drop the track in the box above.
- Move the Key slider by semitones: up for a higher key, down for a lower one.
- Press Change it. The line above the player names both keys.
- Download the MP3.
How many semitones do I need?
Count from where you are to where you want to be: every semitone is one piano key including the black ones, or one fret on a guitar, a guitar key changer, in effect, without retuning the strings.
- A tone up (D to E) is 2 semitones
- A minor third (A to C) is 3
- A fourth (C to F) is 5, a fifth (C to G) is 7
- An octave is 12, the end of the slider
Singing along and it just sits wrong? Try one or two semitones at a time; the difference between "nearly" and "comfortable" is usually smaller than people expect. To lower key by a step or two, drag the slider down that far and listen: usually enough to sit comfortably under a voice. To drop a song's pitch by a full tone instead, go further, but small moves are usually the ones that end up sounding right.
Changing the key online, free
You can change key of song online free, with nothing to install: drop the file in and drag the slider, by ear or by counting semitones exactly. To change key of MP3 tracks, upload the file directly with no conversion first; every change key song online run downloads as a fresh MP3. A key transpose online like this always names the starting and landing key together, so you can transpose key online without doing the music theory in your head. Producers who change music key online in the middle of a project use the same slider each time, and because a key change online takes seconds, it costs nothing to try two or three. You can change key online on a phone just as well. When you change key music can sound brighter or darker than you expect, so listen after every semitone step. To change key of music tracks longer than 10 minutes, split them with the audio cutter first.
As a music key converter it works in semitones, and transposing keeps the scale: A minor shifted up two semitones is B minor, never a major key. So it isn't a major to minor key converter online free tools sometimes claim to be; changing the mode means re-arranging the music, not shifting it.
Reading the key and tempo together
The tempo sits on its own speed slider next to the key one, so you can change BPM of MP3 files before or after shifting the key, and a change BPM online run is free too. If you want to change song speed without touching the key, only move the speed slider. The result reads a BPM key pairing above the player, key BPM before and after.
It works as a key detector and key checker on every render: the starting key is read off the audio with the same reader as the key finder, root note and scale. It is not a separate key identifier or reading tool for files you don't want to change, though, and it isn't a BPM detector either. Just asking "what key is this song?" or "what key is the song in?" before you change anything? The key and BPM finder reads both without changing the file, and the BPM finder does the tempo alone. Producers checking song BPM and key before a set should start there.
Transposing only part of a track
Shifting the whole mix moves the backing and the vocal together. If you want the backing in a new key with no vocal, the voice removed entirely, split first: the instrumental maker gives you the backing on its own, and the acapella extractor the voice. That's the split a singer needs to get a karaoke track a step lower than the original. Then transpose the one you kept. Only after speed or pitch in plain semitones? The pitch changer is the same tool with the speed slider up front. This is a song changer for pitch and speed only; to pull a track apart into separate instruments, use the stem splitter on the home page, or see remix stems.
Related: Make a Karaoke Track From Any Song: Free, Change the Pitch of a Song Without Changing the Speed: Free, No Signup, Free AI Karaoke Maker: Any Song, With Lyrics On Screen.
Sources
- Transposition (music) - Wikipedia: Transposition shifts music up or down by a constant interval
- Semitone - Wikipedia: An octave divides into twelve equal semitones
Common questions
Is there a free song key changer?
Yes. This free online key changer needs no account: it reads the key off your upload, shifts it by the semitones you set, and tells you the key you land in, all in one download. As a key changer online free of watermarks and daily caps, it gives every user the same result.
How do I change the key of a song online?
Drop your track in, drag the Key slider to the semitones you want, press Change it, and download the MP3. As a song key changer online it names the key before and after the shift, so you know exactly where you landed.
Does the song get faster when I change the key?
No. As a key changer song length stays exactly the same; speed has its own slider, so this key changer for songs only moves the pitch unless you move the second slider too.
How do you know what key it was in?
We measure it off the audio before the shift, with the same detector as our key finder. What is the key of a song, technically? The note it settles on and whether it sounds major or minor, and that's what the reader names. On unclear or atonal material it says nothing rather than guessing.
Can I just find what key a song is in, without changing it?
Not on this page: the key is read when you render a shift. To find the key without changing anything, use the key finder; it's the same detector and takes about two seconds.
How do I lower the key of a song online?
Drag the key slider down instead of up: each step is a semitone lower. Upload the track, pick how many semitones to drop it, and download the result; the original length doesn't change.
How far can I transpose?
Up to an octave either way. A song key change of three semitones or so is transparent on most material; a full octave you will hear, especially on vocals.
Which files work?
MP3 works directly, along with WAV, FLAC and M4A, so it's an MP3 key changer with no conversion step. The output is a 192 kbps MP3, the same as the pitch changer MP3 output.
Can it change the key of a video?
You can drop in an MP4 and the audio is taken out of it, so it's an audio key changer for anything with sound in it. You get an MP3 back, not a video.
Can I transpose audio without changing its length?
Yes. As an audio key transposer it only touches pitch: the slider shifts the key and the length stays exactly the same, since duration has its own speed control.
How do I shift a song's key without ruining the audio quality?
Keep the shift under a few semitones and start from a full-quality file. Nothing extra is lost beyond what any pitch shift costs you. To change the pitch of a song in finer steps than a key, use the pitch changer.
Can I use it to get a song in the right key for karaoke?
Yes, that's a common reason to use it: shift the key here, then run the result through the karaoke maker to strip the vocal, or split first and shift only the instrumental.
Does it handle songs with a key change partway through?
Hear the music change key halfway through? The reader names one key, whichever dominates, for a key change song like that. The slider then shifts the whole file by the same amount throughout, so split the track at the change first if you need a different shift on each half.
Can I search a song by key, the way a DJ browses a crate?
No, there's no catalogue to browse here. Upload the one track you have and this reads its key off the audio; from there the Camelot code tells you what else would sit well next to it.
Do I need software or an app?
No install needed: it runs in the browser on desktop or phone, so there is nothing to download and no app to keep updated. Any online music key changer that asks you to install something first is doing more than this job needs.
Why do singers shift the pitch of songs instead of singing in the original key?
Because the original key often sits outside their range. Moving a song one or two semitones up or down is usually enough to make it comfortable, and the key line above the player tells you where you landed.
Is my upload stored?
No. Your upload is deleted the moment it's processed and the result is wiped from the server within 45 minutes (24 hours with any pass, paid or free: that longer window is part of what the pass is for). Nothing is shared or used to train anything. See privacy.