01
Instrumentalists learning by ear
Slow a solo until you can hear every note, loop the hard bar, and bring it back up as it clicks.
Change the speed
Drop in a track. It reads the original tempo first, so you can type the BPM you want instead of working out a multiplier.
Everything happens in your browser. The file is never uploaded, and there is no account to make.
Keep working with this track
Audio Speed Changer
Speed up or slow down any track. Keep the pitch locked or shift both together — a free music speed changer that works in your browser, with a target-BPM box and a practice loop.
How it works
How to speed up or slow down a song
1Step 1
Drop in the track
Any song, practice recording, backing track or podcast. It loads straight from your device — there is no upload, so a 40 MB file starts playing immediately.
2Step 2
Set the speed
Drag the multiplier, or type the BPM you want and let the tempo changer do the arithmetic against the detected tempo. Pitch lock keeps the key where it was.
3Step 3
Loop it, then export
Mark an A and a B point to drill one phrase on repeat. When you want to keep the result, download it as an MP3 or a full-quality WAV, with no watermark.
What you can do
A Tempo Changer That Works in BPM, Not Guesswork
Most speed tools give you a multiplier and leave you to figure out what it means. This one starts from the track's actual tempo.
Type the tempo you want
The tool reads the original BPM first, so you can ask for 90 instead of calculating 0.72×. That is the difference between a tempo changer and a playback-rate slider.
Speed up audio without the chipmunk effect
Pitch lock is on by default: speed up a song and it stays in the same key, so a sped-up track still sounds like the record rather than a cartoon. Turn it off and you get the tape effect on purpose.
Slow down a song to learn it
Take a solo to half speed and every note stays at its original pitch, so what you learn transfers straight back at full tempo. Anything from 0.25× to 4× is fair game.
Loop the bar you keep missing
Set an A point and a B point and the section repeats until you stop it. Combined with a slow speed, that is the whole practice workflow — no editing, no exporting between takes.
Who it's for
Made for People Who Need the Tempo Somewhere Else
Slower to learn it, faster to get through it, exact to fit it.
02
Dancers and choreographers
Drop a track to counting speed while you build the piece, then run it at tempo without re-exporting.
03
DJs and producers
Move a sample to the session tempo, or hear what a track sounds like at the BPM you actually play at.
04
Transcribers and students
Half speed makes dense passages legible, and pitch lock keeps the notes where they were written.
FAQ
Speed and tempo questions
Leave pitch lock on — it is the default here. The tool time-stretches the audio instead of simply playing it faster, so the tempo moves and the key stays put. Turn pitch lock off only when you want the tape or vinyl effect.
Drop the file in, pull the speed below 1× (or type a slower target BPM), and use the A/B loop to repeat the section you are working on. The pitch stays where it was, so what you learn at 0.6× still fits at full speed.
Time-stretching always re-synthesises the audio, so the further you go from 1×, the more you hear it — usually as a slight smearing on cymbals and reverb tails. Between roughly 0.7× and 1.4× it is hard to notice on most material; at 0.25× it is obvious, and that is normal for every tool that does this.
Yes. The pitch control here shifts the key on top of whatever speed you set, and the two stay independent. If the key is the main thing you are after, the song key changer puts that control first and lets you pick a target key or a vocal range.
A quarter speed to four times speed. Downloads are capped at 20 minutes of rendered output, so a very slow setting on a long track will need a shorter source — the preview still plays at any speed.
No. Decoding, time-stretching and rendering all happen inside this page, so the track never leaves your device. There is no queue and no account as a result — just a 50 MB ceiling per file, since your browser has to hold the audio in memory.
The whole track at your current speed and pitch settings, as a 320 kbps MP3 or a 16-bit WAV — your pick. No watermark, no trimming, no account.
Yes, and there is no sign-up. Since the work happens on your machine rather than ours, there is nothing to meter.
Put the track at your tempo
A free audio and music speed changer with pitch lock, target BPM and a practice loop, running entirely in your browser.