Change the pitch and the tempo of a song independently: slow it to 75 % without the key dropping, move it up to 12 semitones up or down without the speed changing, or link both like a record. The song’s BPM is detected, so you can type a target BPM. Nothing is uploaded.
Change Pitch and Speed
Open a song, set the pitch and the speed separately (or link them like a record), listen, download.
Processed in your browser. Your audio is never uploaded.
Start here: choose a song from your device.
File: none yet
Detected: tempo (BPM) and key appear here
Open a file to see and hear it here.
The waveform appears here.
Pitch
0 semitonesPitch unchanged.
Off: pitch and speed change separately.
Tempo (speed)
100 %Speed unchanged.
The song's BPM is detected when you open a file; type the BPM you want.
Download
Open a file first. The download gets the change in its name.
More options fine tune, loop, file format
To repeat one part, drag across the waveform, or use these buttons while it plays.
By default the download matches your file: MP3 for compressed files, WAV for WAV and FLAC. The sample rate is kept.
Pitch and Tempo Calculator
Semitones ↔ speed % ↔ BPM for varispeed (pitch and tempo moving together, like a record). Type in any box.
+2 semitones = 112.25 % speed. 120 BPM becomes 134.70 BPM (ratio ×1.1225, +200 cents).
Formulas: ratio = 2^(semitones ÷ 12) · new BPM = BPM × ratio · semitones = 12 × log₂(new BPM ÷ BPM)
The buttons set the tool above (−12 to +12 semitones, 50 % to 200 %).
| Semitones | Ratio | Speed | Tempo change | BPM (from 120) |
|---|---|---|---|---|
| −12 | 0.5000 | 50.00 % | −50.00 % | 60.00 |
| −11 | 0.5297 | 52.97 % | −47.03 % | 63.57 |
| −10 | 0.5612 | 56.12 % | −43.88 % | 67.35 |
| −9 | 0.5946 | 59.46 % | −40.54 % | 71.35 |
| −8 | 0.6300 | 63.00 % | −37.00 % | 75.60 |
| −7 | 0.6674 | 66.74 % | −33.26 % | 80.09 |
| −6 | 0.7071 | 70.71 % | −29.29 % | 84.85 |
| −5 | 0.7492 | 74.92 % | −25.08 % | 89.90 |
| −4 | 0.7937 | 79.37 % | −20.63 % | 95.24 |
| −3 | 0.8409 | 84.09 % | −15.91 % | 100.91 |
| −2 | 0.8909 | 89.09 % | −10.91 % | 106.91 |
| −1 | 0.9439 | 94.39 % | −5.61 % | 113.26 |
| 0 | 1.0000 | 100.00 % | 0 | 120.00 |
| +1 | 1.0595 | 105.95 % | +5.95 % | 127.14 |
| +2 | 1.1225 | 112.25 % | +12.25 % | 134.70 |
| +3 | 1.1892 | 118.92 % | +18.92 % | 142.70 |
| +4 | 1.2599 | 125.99 % | +25.99 % | 151.19 |
| +5 | 1.3348 | 133.48 % | +33.48 % | 160.18 |
| +6 | 1.4142 | 141.42 % | +41.42 % | 169.71 |
| +7 | 1.4983 | 149.83 % | +49.83 % | 179.80 |
| +8 | 1.5874 | 158.74 % | +58.74 % | 190.49 |
| +9 | 1.6818 | 168.18 % | +68.18 % | 201.82 |
| +10 | 1.7818 | 178.18 % | +78.18 % | 213.82 |
| +11 | 1.8877 | 188.77 % | +88.77 % | 226.53 |
| +12 | 2.0000 | 200.00 % | +100.00 % | 240.00 |
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Related tools
How to change the pitch and tempo of a song
- Open the song. Tap Choose a song or audio file or drop it on the tool. The line under it shows the detected tempo (BPM) and key.
- Set the speed. Tap a preset (50 to 150 %), use −5 / +5, type a percentage, or type a Target BPM: 120 → 96 BPM gives 80 %.
- Set the pitch. Use −1 / +1 or the slider for −12 to +12 semitones. The panel shows the new key, for example G major → F major.
- Listen and download. Press Play, switch between Before and After, then press Download. The file name carries both changes, for example
song_-2st_80pct.mp3.
Turn on Link pitch and speed when you want the old record or tape effect: faster is higher, slower is lower. More options holds fine tuning in cents, a loop for practising one part, and the file format (MP3 128 to 320 kbps, or WAV).
Independent or linked: two ways to change pitch and tempo
Independent (link off) is time stretching: a phase vocoder changes the length of the sound while every frequency (the pitch) stays where it was, and the pitch is moved separately. So 80 % speed keeps the song in its key, and −2 semitones keeps its tempo. This is what most people mean by changing pitch without changing speed; here both directions are free at once. The difference between the two words is explained in pitch vs tempo.
Linked (link on) is varispeed, the way a turntable or tape machine works: playing 12.25 % faster raises every note by exactly 2 semitones. The tool resamples the audio, so nothing is stretched and there are no stretching artefacts, but voices sound “chipmunk” when sped up because their formants move too.
The pitch–tempo formula (varispeed maths)
Speed ratio = 2semitones ÷ 12, and new BPM = BPM × ratio. One semitone is a factor of 1.0595, so +1 semitone of varispeed makes a 120 BPM song 127.14 BPM. The other way round, semitones = 12 × log2(new BPM ÷ BPM): going from 120 to 128 BPM on a record player raises the pitch by 1.12 semitones (112 cents). The calculator under the tool does these sums both ways; semitones explained covers the 21/12 step.
| Speed | Pitch change | In cents | BPM from 100 | Where you meet it |
|---|---|---|---|---|
| 50 % | −12.00 st | −1200 cents | 50 | one octave down |
| 75 % | −4.98 st | −498 cents | 75 | common practice speed |
| 80 % | −3.86 st | −386 cents | 80 | |
| 90 % | −1.82 st | −182 cents | 90 | |
| 92 % | −1.44 st | −144 cents | 92 | turntable pitch fader −8 % |
| 95 % | −0.89 st | −89 cents | 95 | |
| 105 % | +0.84 st | +84 cents | 105 | |
| 108 % | +1.33 st | +133 cents | 108 | turntable pitch fader +8 % |
| 110 % | +1.65 st | +165 cents | 110 | |
| 120 % | +3.16 st | +316 cents | 120 | |
| 125 % | +3.86 st | +386 cents | 125 | |
| 150 % | +7.02 st | +702 cents | 150 | |
| 200 % | +12.00 st | +1200 cents | 200 | one octave up |
A DJ turntable’s ±8 % pitch fader therefore covers about −1.44 to +1.33 semitones, and a 33⅓ rpm record played at 45 rpm (×1.35) sounds 5.2 semitones higher. With the link off, the same speed changes leave the pitch at 0.
Practice speeds for singers and musicians
- Learning a fast part: start at 75 %, then 90 %, then 100 %. Loop the hard bars under More options.
- Too high to sing: lower the pitch 1 to 3 semitones at 100 % speed. Read when a song is too high, what key to sing in and how many semitones to change key.
- Transcribing: 50 % with the link off keeps each note at its real pitch, so you can name it; transposing a song explains the next step.
- DJs and producers: type the target BPM to match two tracks; turn the link on for the classic varispeed sound.
Sound quality and limits
- Accuracy: in our tests every downloaded file was within 0.3 cents of the target pitch and within 0.02 % of the target tempo.
- Range: 50 to 200 % speed and −12 to +12 semitones. Between about 80 and 125 % a stretched song sounds natural; at 50 % drums soften and reverb gets longer.
- Loudness: the level is lowered only if the changed sound would clip: WAV stays below −0.1 dBFS and MP3 below −1 dBFS.
- Speed: for a 3-minute song the changed sound starts playing in about 0.8 seconds, and the whole file is ready in about 7 seconds on a desktop computer. Phones take longer.
- Files: MP3, WAV, M4A, AAC, OGG, FLAC and the sound of MP4, MOV or WebM videos, up to 10 minutes and 200 MB. The video pitch changer gives the video back.
Which tool should you use?
| Tool | Use it when | Speed |
|---|---|---|
| Pitch and tempo changer (this page) | You want it slower or faster, with or without a key change, or a target BPM | Changes |
| Online key changer | You think in key names and want the song in a new key | Kept |
| Audio pitch changer | Pitch only, any file format, fine editing | Kept |
| MP3 pitch changer | Several MP3s to transpose at once | Kept |
| Karaoke pitch changer | A backing track in your key, ♭/♯ buttons | Kept |
| Vocal pitch changer | A voice recording, with formant correction | Kept |
| Semitone calculator | Only the maths between two notes, no audio | – |
Questions about pitch and tempo
How do I change the tempo of a song without changing the pitch?
Open it in the tool above, keep the link off and set the speed. A preset, the percentage field or a target BPM all work. The pitch stays at 0 semitones, so the song stays in its key.
How much does the pitch change when I change the tempo?
Only when pitch and speed are linked: semitones = 12 × log2(speed). 110 % is +1.65 semitones and 80 % is −3.86 semitones. The table above lists the common speeds.
How do I change a song from one BPM to another?
Type the song’s BPM and the target BPM: the speed is the target divided by the original, so 120 → 100 BPM is 83.3 %. The detector can report half or double the beat; correct it if needed.
Can I change pitch and speed at the same time?
Yes, separately or together. With the link off, set any pitch and any speed, such as −2 semitones at 75 %. With the link on, one control moves both, like a record.
How many semitones is an 8 % pitch control?
+8 % is +1.33 semitones and −8 % is −1.44 semitones. A 120 BPM track covers 110.4 to 129.6 BPM on a turntable’s ±8 % fader, and the key moves with it.
Is it free, and is my audio uploaded?
It is free, with no sign-up, and your audio is never uploaded. Your browser does all the work on your device, with no watermark and no daily limit.
Tested: what we measured
- 17 downloaded files re-measured: pitch within 0.3 cents, tempo within 0.02 % (from 50 to 200 % speed, −12 to +12 semitones, linked and independent).
- A 120 BPM song in G major set to 100 BPM and −2 semitones was analysed again: 100 BPM, F major.
- The preview you hear equals the downloaded file sample for sample; MP3 was decoded again and measured.
- Every number in the calculator table checked against the formula.
Last updated 27 September 2026 by Mayer. More tools on the online pitch changer home page; how we test: how it works.