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×.)
The mechanism differs slightly depending on where the audio comes from, worth knowing so you know what you're hearing. On a YouTube video, the pitch-hold is YouTube's own: we set the playback rate through YouTube's player, and its player is what keeps the pitch in place. On a file you upload, the browser does it: on Chrome and Firefox the app hands the audio to a higher-quality time-stretch of its own, and on Safari and on phones and tablets it uses the browser's built-in pitch-hold instead. Either way the result is the same — slower, not lower.
Works on YouTube — and on your own recordings
The free tier slows and loops any embeddable YouTube video, no account needed. Your own files get the same pitch-preserved speed control and looping too — upload a recording of your lesson, your band's rehearsal, or a track you own — but that part needs a free account (guests can't upload; signing up costs nothing, and your files stay on the device you added them on either way). Pro is £4.99 / €5.99 / $6 a month, or £47 / €57 / $58 a year, and is what keeps those uploads in sync across 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 stairway. That record, not the slider, is what gets the piece to full tempo. And on a YouTube video whose description already lists timestamps, framing those sections is optional busywork: Stairway2Fast can offer the creator's own timestamps as ready-made loops when you add the video, so slowing down the second verse doesn't start with finding it.
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 — a guest can slow anything down right now, with the loop, the speed, and the practice history staying in that browser. A free account is only for carrying that same setup to a second device; it copies over on its own the moment you create one.
Is this allowed by YouTube?
Yes. Speed and loop control both run on YouTube's own public player API, and the video itself never leaves YouTube's embedded player — nothing is downloaded, extracted, or hosted anywhere but there.
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, using the app's own time-stretch rather than YouTube's (they stay on the device you added them on). It does need a free account, since guests can't upload — signing up costs nothing. Pro syncs uploads 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.