BPM Changer: Speed Up or Slow Down Any Song

A BPM changer makes a song faster or slower without touching its key: type 100 into a track that runs at 120 and it plays about 17% slower, at the same pitch. Drop a file here or record one, check the detected tempo, set the new BPM or a percentage, keep the pitch or switch to vinyl mode, then save MP3 or WAV. Free, in your browser, with nothing uploaded.

Pitch Stays the Same
Target BPM or Percent
Vinyl Mode
MP3 or WAV, No Upload

Free · runs in your browser

Drop a song to change its BPM

MP3 · WAV · M4A · FLAC · OGG · AAC · MP4 · WEBMone file, up to 200 MB and 15 minutes

Or drop a file anywhere on this card.U open a fileR recordD demo

Try a demo

Real recordings and a synth groove, processed in your browser like your own files

Runs in your browser, nothing uploadedFree to convertNo sign-up to listen

Time-stretching keeps the key while the tempo changes; vinyl mode lets the pitch follow the speed. 80 to 125 % speed sounds natural on most songs, and drum hits stay sharp at any setting.

More Tools

Key Finder BPM Finder Tap Tempo Pitch Detector

What a BPM Changer Does to Your Song

Tempo is how many beats go by each minute. To change BPM, every beat has to move closer together or further apart while every note keeps its pitch, and that is what time stretching audio means. This BPM changer cuts the song into overlapping 4096-point frames, moves them apart or together and re-joins them with each harmonic's phase locked to its spectral peak, so sustained notes stay smooth. Each drum hit is copied at its original speed and placed on the new beat grid, so attacks stay sharp; in click-track tests the onsets landed within 1.5 ms of where they belong, from half to double speed. The speed ratio is simply the new tempo over the old one: 100 over 120 is 0.833, so a 3:00 song becomes 3:36 long and every beat lands 0.6 seconds apart instead of 0.5. The detected tempo comes from the same analysis as our BPM finder, so you start from a number instead of a guess.

Change a Song's BPM

How Far Can You Change BPM Before It Sounds Stretched?

Time stretching rebuilds the audio, so it is cleanest close to the original speed. What to expect from any audio tempo changer, this one included:

80 to 125% speed: natural on most songs. A 128 BPM track moved to 124 or 140, or a practice copy at 85%, sounds like the original. This is where DJs and producers work.
65 to 80%, or 125 to 150%: a slight wash. Long notes and reverb pick up a faint smear while drum hits stay sharp. Fine for practice and most edits.
Beyond that: phasey on dense mixes. The full 0.5x to 2x range is there and the drums still land on time, but a full mix sounds audibly processed. Use it for practice, not for release.
The starting BPM decides the rest. If the detector read half or double the real tempo, every target is off by the same factor, so fix it with half, double or tap first.
Vinyl mode has no artefacts. It only resamples, like a turntable, so it sounds clean at any speed; the price is that the pitch moves too.

Try It on a Song

Why Use This BPM Changer Online

An audio BPM changer that starts from the real tempo and lets you hear the result before you save it.

Type the BPM you need
Enter 90, 124 or 172 and the speed is worked out for you, or drag the speed slider in percent. No ratio maths, no trial and error.
Key stays put
Keep pitch is on from the start, so a song played slower is still in its own key and still in tune with your instrument.
Fix the starting tempo
If the detector heard a track at half or double its real tempo, one click corrects it; you can also type the original BPM or tap along. The new BPM is only as right as the old one.
Preview straight away
The changed tempo plays as you set it. Loop a hard bar, flip to the original with one key, or turn on a click locked to the song's own beats, so it ticks at the new tempo.
Nothing leaves your device
Slow down audio online without sending it anywhere: decoding, stretching and encoding run in your browser tab, so rehearsal takes and DJ promos stay on your computer.
Free, no account
No sign-up, no credits and no watermark. Use the song BPM changer for one track or a whole set list.

How to Change the BPM of a Song in Four Steps

Change BPM in about a minute, and hear every change before anything is saved.

Drop a file onto the BPM changer. MP3, WAV, M4A, AAC, FLAC and OGG work, plus the soundtrack of MP4 and MOV video, up to 200 MB and 15 minutes. Or record 5 to 60 seconds from the mic, or open one of four demos.
The BPM changer reads the tempo from the first two minutes while the waveform appears. If it shows half or double what you feel, fix it with the half and double buttons, type it, or tap along.
Type a target BPM, pick a quick tempo or move the speed in percent: the BPM changer works anywhere from half to double speed. Leave keep pitch on, or switch to vinyl mode for the turntable sound.
Loop a section, switch between original and changed, measure the changed audio if you want proof, then download MP3 or WAV. The file name records the new tempo, such as "song (100 BPM).mp3".

Step 1 · Add a song

Tempo Changer Features for Practice, DJ Sets and Workouts

What people need from a song speed changer, all on one page.

Target BPM or percent, your choice

Musicians think in BPM, practice apps think in percent, and this page shows both. Type 100 into a 120 BPM song and the speed reads 83.3%, 20 BPM slower; drag to 75% and the target reads 90 BPM. Quick picks cover half-time, double-time, the rounded tempo and common DJ tempos such as 124, 128 and 174. The new length and the length of one beat update too, so you know a three minute track at 75% will run four minutes before you save it.

Set a Target BPM

Keep pitch, or vinyl mode

With keep pitch on, the BPM changer stretches the song and it stays in its key. Turn it off and you get vinyl mode: the audio is simply played faster or slower, so pitch rises and falls with the speed, like a turntable or a tape deck. It doubles as a pitch tempo calculator, because about 6% faster is one semitone higher: a song sped up from 120 to 127 BPM moves up a semitone.

Compare the Two Modes

Half time, double time and tap tempo

Tempo detection can lock onto half or double the beat you feel, especially on hip-hop, trap and drum and bass. On the BPM changer, the half and double buttons fix the starting BPM in one click, you can type the right value, and tapping along on the pad or the T key sets it by hand. Want a second opinion first? Use tap tempo on its own page.

Fix the Starting BPM

Loop, A/B and a click at the new tempo

Drag across the waveform to loop the bar you are learning, then press B to hear the original speed at the same point. Slow a solo to 70%, learn it, then come back up in steps until it plays at full tempo. The click track follows the song's own beats, so it ticks at the new tempo and shows straight away whether the groove still sits; for practice away from the track, use the metronome.

Loop a Passage

Measure the result, then save it

Measure the changed audio and the BPM changer renders the first two minutes with your settings, runs the same BPM detection on them and shows the tempo before and after. Export then renders the whole song with the same engine as the preview: MP3 at 320, 192 or 128 kbps, or 16-bit WAV for editing. As an MP3 BPM changer it encodes once from the decoded audio, and the new file is exactly as long as the speed says: 3:00 at 0.8x is 3:45.

Check and Export

Real BPM Changer Output: A Walking Bass From 132 to 110 BPM

The walking bass demo from our BPM finder, slowed by the BPM changer engine with keep pitch on in Microsoft Edge and read back by the same analysis. The render took about half a second.

What you are looking at

Before: 132 BPM, F major (7B), 24.03 seconds. After setting the target to 110: the speed is 83.3%, the clip runs 28.84 seconds, exactly 20% longer, the tempo reads 110 BPM and the key still reads F major, because only the timing moved. In vinyl mode the same speed would also lower the pitch by 3.16 semitones, from F to just below D. That is the difference between the two modes in one line.

Try It Yourself

How to Slow Down a Song to Learn It

How do I slow down a song and actually get faster? Players and teachers use the same routine.

Find the hard part
Loop the four or eight bars you cannot play yet. Working on the whole song at a slow tempo wastes time on parts you already know.
Start where it is clean
Make the song slower until you can play the loop without mistakes, often 70 to 80%. Keep pitch on so you stay in tune with the track.
Step up by 5%
After three clean passes, raise the speed by 5%. Each step should feel only a little harder; if it falls apart, go back one step.
Finish at full speed
The last step is 100%. Play along with the original, then with the drums alone if you have them, until it sits in the pocket.

What to Expect From a Tempo Changer

How cleanly a BPM changer can change the tempo depends on the recording more than on the number. These are the patterns we hear in our own tests; we publish no quality score.

Steady instruments: the cleanest

Piano, organ, pads and sustained guitar stretch smoothly between 80 and 125%, because the phase vocoder follows steady harmonics easily. Slower than that, long notes pick up a slight wash.

Drums: sharp at any speed

Each hit is copied at its own speed and lands on the new beat grid, so attacks stay crisp from half to double speed. What changes is the gap between hits, and long cymbal tails are stretched with it.

Vocals and rooms: the giveaway

Breath, vibrato and reverb tails reveal a big stretch first. For a mix you will publish, stay close to the original tempo.

Full mixes: fine for small moves

A DJ nudge of a few percent is effectively invisible. Practice copies at 70% have a slight wash but stay clear and in tune.

BPM Changer Comparison: Four Free Browser Tools

Tools people find when they look to change BPM online. Facts from each tool's own page as of November 2026; all four are free to use.

BPM Changer Comparison: Four Free Browser Tools
	This siteToMIDI	Lacuna	Vocal Remover	TunePocket
Speed range	0.5x to 2x	0.25x to 4x	0.5x to 1.5x	Not stated
Target BPM	Type a BPM or a percent	Type a BPM	Slider, BPM shown	Type a new BPM
Starting tempo	Detected; half, double, type or tap	Detected	Detected	Auto detect or typed
Pitch	Keep pitch or vinyl mode	Pitch lock on or off	Separate pitch slider	Preserve pitch option
Download	MP3 128 to 320 kbps or 16-bit WAV	320 kbps MP3 or 16-bit WAV	MP3 up to 320 kbps or WAV	MP3 128 to 320 kbps or WAV
File limit	200 MB, 15 minutes	50 MB in, 20 minutes out	Not stated	50 MB, 10 minutes
Processing	In your browser	In your browser	In your browser	In the browser, no install

Who Uses a Song Speed Changer

Anyone who needs a song at a tempo it was not recorded at. A song speed changer earns its place in more routines than you might think.

Musicians learning songs

Slow a solo, a fill or a fast verse until every note is clear, then speed it back up. Want the notes on paper too? Turn the slowed file into MIDI with our audio to MIDI converter.

DJs

Use the BPM changer to bring a 124 BPM track to 128 for a set, or prepare a slowed edit. Match the keys as well with the Camelot wheel before you mix.

Runners and fitness classes

Speed up a song to match a running cadence or a class tempo, or slow it for a cool-down. Keep pitch on so the music still sounds like itself.

Singers and dancers

Rehearse a routine or a fast lyric at 85% in the tempo changer before taking it to full speed, without the pitch dropping out of your range.

Producers

Fit a loop or a sample to the project tempo with the audio tempo changer before you chop it. A WAV export keeps the full quality for the session.

Teachers

Make the music slower for beginners: practice tracks at 70, 80 and 90% give each lesson a backing track that grows with the student.

BPM Changer FAQ

Straight answers about changing the tempo of a song.

How do I change the BPM of a song?

Open it in a BPM changer, check the starting tempo, set the new one and save. Here: drop the file at the top of the page, fix the detected BPM with half, double or tap if needed, type the target BPM, listen, then download MP3 or WAV.

How much can I change the BPM before it sounds bad?

With this tempo changer, 80 to 125% speed sounds natural on most songs. From 65 to 80% or 125 to 150%, long notes and reverb pick up a slight wash while drums stay sharp. Beyond that, dense mixes sound audibly phasey: fine for practice, less so for release.

Does changing the BPM change the pitch?

Not with keep pitch on: the song changes speed and stays in its key, which is how you speed up audio without changing pitch. Turn it off for vinyl mode, where pitch follows the speed like a record player.

What is vinyl mode?

Vinyl mode plays the audio faster or slower without stretching it, so you change speed and pitch of audio together, as a turntable does. About 6% faster is one semitone higher, and 33 to 45 rpm is about 5.2 semitones. It has none of the stretching artefacts, which makes it a clean audio pitch and speed changer, a tempo and pitch changer in one control, when you want both to move.

How can you slow down a song without changing the pitch?

Use time stretching, not playback speed. Leave keep pitch on, type a lower BPM or drag the speed below 100%, and the song gets slower while every note stays in tune. That is how to slow down music for practice, and also how to slow down audio of a lesson you are writing out by hand.

What if the detected BPM is wrong?

Usually it is half or double the tempo you feel, which one click on the half or double button fixes. Otherwise type the right value or tap along to set it by hand. The target BPM is worked out from that starting value, so it is worth getting right. For a full report on the beat, use the BPM finder.

How do I change the BPM of an MP3 and keep the quality?

Any MP3 BPM changer writes a new encode, so to change BPM of MP3 files with the least loss, save at 320 kbps, or save WAV if you will edit it further. Always start from the original file: every encode adds a little, so never re-stretch an export. To change BPM of audio that came as WAV, keep it WAV.

Can I change BPM and key at the same time?

Vinyl mode moves both together. To change pitch and tempo separately, set the tempo here and the key on the song key changer. The two pages share one engine, so as a pair they work as a pitch and tempo changer, or a key and BPM changer, with the same quality either way round.

Is there a BPM changer extension?

You do not need a BPM changer extension or a music speed changer extension for files you have: this page runs in any current browser with nothing to install. It changes files you open, not audio playing in another tab. There are apps to slow down music on phones too, but none of them is needed here.

Will the beat drift out of time?

No. The BPM changer applies the stretch evenly, so the new file is exactly as long as the speed says and every beat moves by the same ratio. A song changed from 120 to 100 BPM lines up with a 100 BPM grid in your DAW.

How do I check the new tempo?

The BPM changer gives you two ways. Turn on the click track while it plays: it follows the song's own beats, so you hear at once whether it sits at the new tempo. Or press Measure the changed audio, which renders the first two minutes and runs the same BPM detection, then shows the tempo before and after.

Is my audio uploaded?

No. The file is decoded, stretched and encoded inside your browser tab and never leaves your device. Long files depend on your computer's memory, so the limit is 15 minutes and 200 MB per file.

Can I change the tempo of a YouTube video?

Not from a link: there is no URL box and nothing is downloaded for you. If you have the video file or its audio, drop it in and the soundtrack is saved as audio at the new tempo.

Can I speed up a song for running?

Yes. Many runners aim for a cadence of roughly 160 to 180 steps a minute; set the target BPM in the BPM changer to your cadence, or to half of it for slower songs, and keep pitch on. To speed up songs for a whole playlist, repeat it file by file.

Which files can I use?

You can change the tempo of audio in any common file: MP3, WAV, M4A, AAC, FLAC and OGG, plus the soundtrack of MP4, MOV and WebM video, as far as your browser can decode them. You can also record 5 to 60 seconds from the mic. Saving is in MP3 or WAV.

Is this BPM changer online free?

Yes: no sign-up, no credits and no watermark. Because the processing runs on your own computer, there is no queue and no daily limit.

More Tempo and Key Tools

Put the New Tempo to Work

Learn the notes, the chords and the groove at the speed you just set.