Music Speed Changer

What is a music speed changer?

A music speed changer, sometimes searched for as a BPM changer, plays a track faster or slower than its original recording without you needing to re-record or re-perform anything. This one covers a wide range, from 25% (roughly quarter speed, useful for picking apart a fast passage note by note) up to 300% (triple speed).

The speed control works two ways: keep pitch, which uses time-stretch processing to change how fast the track plays while the musical key stays exactly where it was, and linked, which raises or lowers pitch together with speed, the way a vinyl record or tape sounds when you physically speed it up or slow it down. Which one you want depends entirely on what you're doing — practice generally calls for keep pitch, while some creative effects call for linked.

Keep pitch vs. linked: two different tools in one

Keep pitch decouples speed from key. Slow a song to 60% and it still plays in its original key, just slower — this is what most instrumentalists, singers, and dancers want when learning a part, since the pitches they're matching by ear don't move. It's also what you want when speeding a track up for a quick listen without turning vocals into a chipmunk-pitched blur.

Linked mode ties pitch to speed the way a physical medium naturally does: slow down and pitch drops, speed up and pitch rises. It's a deliberate creative choice rather than a practice tool, closer to what a turntable does when you push the pitch fader. If you're after that vinyl-style linked sound specifically as an aesthetic rather than a practice aid, the nightcore and slowed + reverb tools are built around it with additional controls for that effect.

BPM math: setting an exact target tempo

If you know the tempo you need rather than a rough percentage, BPM mode does the conversion for you. Once the source BPM is detected, type your target and the speed percentage updates automatically: dropping a 120 BPM track to a 90 BPM practice tempo sets speed to 75%, since 90 divided by 120 is 0.75. The same math works speeding a track up — a 90 BPM track sped to 120 BPM sets 133%.

This is the more reliable approach whenever a specific number matters, like matching a metronome, syncing to a DJ set, or hitting a target tempo for a dance routine, rather than eyeballing a percentage slider and hoping it lands close enough.

Half-time and double-time: why your target BPM might already exist

Tempo can be ambiguous by nature, not just by measurement error. A track that feels like 140 BPM to one listener can just as validly be counted as 70 BPM by someone tapping on every other beat instead of every beat — this shows up often in electronic genres where the beat can be felt in more than one grouping. If a detected or target BPM looks exactly double or half of what you expected, that's usually why, not a mistake.

The half/double buttons handle this directly: one click sets the target to exactly twice or half the current tempo, so you can quickly check whether the other reading matches what you actually meant, without retyping a number and second-guessing the math.

Practicing with a loop and instant preview

Playback updates in real time as you move the speed slider, so you can hear a new tempo immediately rather than rendering first and listening after. That instant, pitch-preserving preview is what makes this useful for practice specifically: you can slide from 100% down to 70% mid-listen and hear the difference right away.

Loop a region — the tricky bar, the fast run, the section you keep missing — and it repeats at your chosen speed for as long as you need. Nudge the speed up gradually as the passage gets more comfortable, a standard way to build up to full tempo without ever practicing mistakes into a part.

Music speed changer vs. sped up vs. nightcore

These three tools sound related but serve different intents. This tempo changer is built for practice and exact tempo targets: a wide 25-300% range, a BPM mode with real math behind it, and looping for repetition. Pitch stays fixed by default, because the point is usually to change speed without changing what key you're matching.

Sped up is aimed at creator edits: a faster, punchier version of a track for short-form video, with pitch kept fixed by default (so it doesn't sound chipmunked) and a BPM helper for hitting a specific target, but without the practice-focused looping this tool has. Nightcore is a specific aesthetic built around linked speed and pitch rising together, plus presets tuned for that recognizable sped-up, higher-pitched sound, rather than a general-purpose speed tool.

Guides for this tool