Slow down music without changing pitch
Paste a YouTube link into Stairway2Fast and play it at 0.5× while every note stays at its real pitch — an A stays an A, a voice stays a voice, just slower. Free, in your browser, no signup, with a section looper built in so you can repeat the part you're actually working on.
▶ Try it live — no signup opens the practice player
How it works
- Paste a YouTube link. Any song, lesson, or cover that allows embedding plays here, through YouTube's own player.
- Pick a speed. Steps from 0.25× to 2×. The pitch is preserved at every step, so slowed music still sounds like music.
- Loop the hard part. Two handles frame the bars you're learning; the section repeats at your chosen speed until you've got it.
What "without changing pitch" actually means
On a record player or a tape machine, slowing the music down also lowers it — half speed drops everything an octave, and speeding up gives you the chipmunk effect. That's because speed and pitch are physically coupled: play the same waveform slower and every vibration gets slower too.
Pitch-preserving time-stretch decouples them. The software stretches the audio over more time while keeping the frequencies where they were — so at 0.5× the notes arrive at half pace but each one is still the note the artist played. For practice, that's the whole point: your ears are learning the real pitches and your hands are learning the real intervals, just with more time to place them. (Very low speeds trade a little clarity for the stretch — at 0.25× any time-stretcher sounds slightly smeared — which is why most practice happens between 0.5× and 0.9×.)
Works on YouTube — and on your own recordings
The free tier slows and loops any embeddable YouTube video — and your own files too: upload a recording of your lesson, your band's rehearsal, or a track you own, and get the identical pitch-preserved speed control and looping (uploads stay on the device you added them on). Pro (£4.99/$6 per month) keeps them — kept in sync on every device you practise on.
The part other slow-downers don't do: it remembers
Plenty of tools can time-stretch a song — and then forget you were ever there. Stairway2Fast keeps the record: every video remembers its loops and the speed you left off at, and every minute of practice logs itself against the section you were working. After a couple of weeks you can see the climb — the riff you started at 0.6× and finally broke 0.9× on — plus streaks, daily goals, and a per-song speed history. That record, not the slider, is what gets the piece to full tempo.
FAQ
Why do other tools make slowed music sound like a chipmunk (or a monster)?
They change the playback rate without decoupling pitch, like slowing a tape: the waveform plays slower, so every frequency drops and voices go deep and smeared; sped up, they go squeaky. Pitch-preserving time-stretch processes the audio so the timing changes but the frequencies don't — slower, same notes.
Does it really keep the pitch at every speed?
Yes, across the whole 0.25×–2× range. Expect a little audible smearing at the extreme low end — that's inherent to time-stretching — but in the practical practice band (0.5×–0.9×) it stays clean.
Do I need an account?
No. Open the app and practise as a guest — loops, speeds, and history are kept in your browser. Create a free account when you want it synced across devices; everything migrates automatically.
Is this allowed by YouTube?
Yes. The video plays in YouTube's own embedded player, and speed/loop control uses YouTube's public, documented player API. Nothing is downloaded, ripped, or re-hosted.
Can I slow down my own MP3s or recordings?
Yes — and uploading is free: your own audio or video files get the same pitch-preserved speed control, looping, and practice tracking as YouTube videos (they stay on the device you added them on). Pro syncs them across your devices.
Can it change the pitch without changing the speed (transpose)?
No — this is a practice tool, not a transposer. It changes speed while holding pitch, which is the direction practising musicians need.
Hear it slow, learn it right. Open a song, drop the speed, and keep every note where it belongs.