Boom-bapInstrumental90 BPM
Crate Digger
Made with MiniMax Music 3.0 · Slow it down to practise bars
—
PromptClassic boom-bap hip-hop beat, dusty kick and snare, chopped soul sample, deep bass, head-nod groove, 90 bpm
Free · no upload · WAV export
BPM changer: change the tempo, keep the pitch
A free tempo changer for any song: load a track, see its detected BPM, dial in a new tempo and preview it with the pitch kept. Download the result as a WAV. Everything happens in your browser.
Original
— BPM
New tempo
120 BPM
Analysed on your device — never uploaded
- Tempo changes, pitch stays
- Auto-detects the original BPM
- Runs locally, never uploaded
- Free WAV download
Updated by the Kenerate AI team
On this page
Quick answer
How do you change a song's BPM without changing its pitch?
To change a song's BPM without changing its pitch, time-stretch it. Load the file into the tool above: it detects the original BPM, you set a new one from 50% to 150% of the original, and Preview plays it with the pitch kept. Download WAV renders it on your device; the file is never uploaded.
Key facts
- Tempo range
- 50%–150% of the original tempo
- BPM detection
- Estimate, 60–200 BPM, can land on half or double time
- Pitch
- Kept (time-stretch)
- Privacy
- Processed locally
- Opens
- MP3, WAV, M4A or OGG, up to 60 MB
- Export
- 16-bit WAV, free
- New length
- Original length ÷ speed
- Method
- WSOLA time-stretching
Listen first
Tracks to practise with at any tempo
Make an original backing track, then slow it down to learn it and speed it back up as you improve.
Bossa novaInstrumental124 BPM
Rio Afternoon
Made with Ken Music 1.5 · Practise the comping slower
—
PromptBossa nova, nylon-string guitar, soft brushes, flute melody, warm and breezy, Rio beach afternoon, 124 bpm
EDMInstrumental128 BPM
Hands Up
Made with MiniMax Music 3.0 · Match it to a DJ set
—
PromptBig-room EDM festival track, huge build-up, massive drop with punchy kick and lead synth, crowd energy, 128 bpm
Jazz trioInstrumental132 BPM
Last Set
Made with Ken Music 1.5 · Learn the solo at 80%
—
PromptJazz piano trio, swinging piano solo, upright bass, brushed drums, late-night club, 132 bpm
How to
How to use the BPM changer
- Time needed
- Steps
- 4 steps
Step 1
Choose a file
MP3, WAV, M4A or OGG, up to 60 MB.
Step 2
Check the detected BPM
The slider starts at the original tempo.
Step 3
Set the new BPM
Slider or ±1 / ±5 / ±10.
Step 4
Preview
Pitch stays the same.
See it in the app
Open Music Studio and pick a song from a prompt, a song from your lyrics, or an instrumental.
1 / 5 · Choose what to make
Watch the tour · 1:24
Prompt & lyrics to song, instrumentals, models, your tracks & chat
Chapters
Engines
Engines for tracks at an exact BPM
Facts from the app's engine list.
MiniMax
MiniMax Music 3.0
- Length
- Up to 4 min
- Modes
- Song · Lyrics · Instrumental
Open MiniMax Music 3.0Best for
Follows [Verse]/[Chorus] section tags closely
Kenerate
Ken Music 1.5
- Length
- Up to ~3 min
- Modes
- Song · Lyrics · Instrumental
Open Ken Music 1.5Best for
Default engine: full songs with vocals in any language; can take an image as inspiration
ElevenLabs
ElevenLabs Music v2.5
- Length
- Exact length, 10 s–10 min
- Modes
- Song · Lyrics · Instrumental
Open ElevenLabs Music v2.5Best for
Set the exact duration; clean studio mix
Mureka
Mureka V9.5
- Length
- Up to 4 min
- Modes
- Song · Lyrics · Instrumental
Open Mureka V9.5Best for
Writes its own lyrics from a prompt; style chips; MP3/WAV/FLAC
Prompt recipe
Or make it at the right BPM
Generate an original track at exactly the tempo you need.
- Practising
- Slow a part to 70–85%, then step back up.
- DJ mixing
- Nudge ±2–6% to match the next track.
- Video edits
- Stretch a cue slightly to land on a cut.
- Workouts
- Match a steady cadence, e.g. 160–180 steps/min.
- Keep it natural
- Changes within ±10% sound cleanest.
Running 170
High-energy running music, driving drums, uplifting synths, 170 bpm
Practice 90
Boom-bap backing beat to rap over, dusty drums, soul sample, 90 bpm
DJ 124
Tech house groove, rolling bassline, crisp hats, 124 bpm
Yoga 70
Calm flowing yoga music, soft pads, gentle hand drums, 70 bpm
Tips
Cleaner tempo changes
What sounds best.
Stay within ±10% for the most natural sound.
Big slow-downs can smear drum hits — that's normal for any time-stretch.
If the detected BPM is half or double what you hear, set the target the same way.
Long tracks take longer to export on phones.
Only process music you have the rights to use.
Example uses
How creators use BPM changer
Illustrative examples of typical workflows, not customer reviews.
Guitar student
A guitar student could slow a hard part to 80% to learn it, then step the tempo back up.
DJ
A DJ could nudge a track a few BPM so it matches the next one in the set.
Video editor
A video editor could stretch a music cue slightly so it lands on a cut.
FAQ
BPM Changer questions
10 questions
How do I change the BPM of a song?
Load it into the BPM changer above, set the new BPM, preview it and download the WAV. The tempo changes; the pitch stays the same.
Link to this answerCan I speed up a song without changing the pitch?
Yes — that's what time-stretching does. The preview uses your browser's pitch-preserving playback, and the export uses WSOLA time-stretching.
Link to this answerIs the BPM changer free?
Yes — free, no sign-up, and it runs on your device.
Link to this answerIs my file uploaded?
No. Detection, preview and export all happen in your browser.
Link to this answerWhat is a tempo changer?
A tempo changer makes audio faster or slower. Good ones, like this page's tool, keep the pitch while they do it. BPM changer and tempo changer mean the same thing here: tempo is just measured in beats per minute.
Link to this answerHow much can I change the tempo?
From 50% to 150% of the original. Changes within about ±10% sound the most natural.
Link to this answerDoes changing the BPM change the song's length?
Yes. The new length is the original length divided by the speed. A 3:00 song at 120% lasts 2:30, and at 75% it lasts 4:00.
Link to this answerWhat if the detected BPM is wrong?
Your speed still works out correctly if you set the target from the same number. The tool only uses the ratio between the two, so a song detected at half its real tempo still gets the right percentage. It's the percentage shown under the slider that matters.
Link to this answerWhat's the difference between this and slowed + reverb?
The BPM changer keeps the pitch. Slowed + reverb (and nightcore) change speed and pitch together, like a turntable. At 85% speed, the slowed tool drops a song by about 2.8 semitones and adds reverb, while this tool keeps the key and adds nothing.
Link to this answerHow do I check a song's BPM manually?
Tap or count the beats for 15 seconds while the song plays, then multiply by four; for a closer number, count for a full minute. If the result feels twice as fast or slow as the groove, halve or double it. For a quick automatic estimate, the free BPM and key finder reads the tempo from the file on your device.
Link to this answerIn depth
BPM Changer, explained
What works, what to avoid, and how the pieces fit.
On this page
How to speed up or slow down a song without changing the pitch
Load the song into the tempo changer at the top of this page, then:
- Set the tempo — drag the slider or use the ±1, ±5 and ±10 buttons. The line under the slider shows the speed as a percentage.
- Preview it — your browser plays the file at the new speed with its pitch kept [1]. You can move the slider while it plays.
- Download the WAV — this step uses a different method, WSOLA, so it can sound slightly different from the preview.
- Check the length — the file gets shorter when you speed up and longer when you slow down. A 3:00 song lasts 2:30 at 120% and 4:00 at 75%.
Tempo changer or slowed + reverb: which do you need?
Both change how fast a song plays, but they sound very different. Pick by what you want to keep:
- This BPM changer — keeps the key and adds no effects. It suits practice, DJ matching and fitting music to a video.
- Slowed + reverb maker — pitch follows speed, like a turntable. Its 85% preset sits about 2.8 semitones lower, with reverb on top.
- Nightcore or sped up — also on the slowed + reverb maker. At 125% the song sits about 3.9 semitones higher.
- Pitch changer — the opposite job: a new key at the same tempo.
How the BPM detection works
The tool looks for repeating beats in the audio and picks the strongest tempo between 60 and 200 BPM. That makes it an estimate, and a song can land on half or double the tempo you hear. To check it, use tap tempo or play it against the online metronome.
How time-stretching works
Simply playing audio faster raises its pitch. Time-stretching avoids that by cutting the audio into tiny overlapping slices and re-joining them closer together (faster) or further apart (slower). WSOLA picks each join point where the waveforms match best, which keeps the result smooth.
Uses
Why people change BPM:
- Musicians — learn fast parts slowly.
- DJs — match tempos between tracks.
- Editors — fit music to a scene.
- Runners and dancers — match a cadence.
By the Kenerate AI teamLast updated and reviewed
We build and run the Kenerate Music Studio. Every demo on this page is a real output of the engine named on it, made from the prompt shown; engine facts were checked against the app's code.
Sources: MDN — Web Audio API
