Slow music down to a quarter speed or push it to 4× - the pitch never moves. Time-stretching from the TuttiDAW engine, running on your device.
100% in your browser - your files never leave your device.
Any MP3, WAV, OGG, FLAC or M4A. Decoding happens in your browser; the file never uploads, so even long tracks load in a blink.
The slider runs from 0.25× to 4× on a logarithmic scale, with presets for the usual practice speeds (0.5×, 0.75×, 0.9×). Preview plays the stretched audio live at the exact pitch of the original.
Export renders offline through the same engine you previewed, so even a slowed-down full song saves in seconds as an uncompressed WAV — drop it on your phone for the rehearsal room or into your DAW.
Slowing music down without dropping the pitch is the classic practice tool: a solo at 75% speed stays in the same key as your instrument, so you can play along while you learn it, then creep the slider back up toward full tempo. Transcribers live at 50% - fast runs become readable note by note while harmony stays recognizable.
The other direction is just as useful: speech and lecture recordings at 1.5× save time without turning voices into chipmunks, and DJs and editors use small stretches (±10%) to fit a track to a set tempo or a video cut without an audible pitch change.
Like the pitch shifter, this is a proper time-stretch, not a turntable-style resample: the audio is re-synthesized at the new duration with its pitch intact. Moderate changes (0.7×-1.4×) sound transparent on most material; extreme settings smear transients on any engine - at 0.25× that smeared, ambient quality is often the point.
No. The engine time-stretches the audio, so a track at 0.5× plays half as fast in exactly the same key. That is the whole difference from simply resampling, which would also drop the pitch an octave.
From 0.25× (four times slower) to 4× (four times faster), with fine steps in between and one-click presets for common practice speeds.
No. Decoding, stretching and encoding run inside the page on your device — nothing is sent to a server. Files up to 10 minutes long are supported; trim longer recordings first.
Seconds. The stretch renders offline through the TuttiDAW engine instead of playing through in real time, so even a song slowed to 0.5× saves almost instantly.
Yes - the stretch preserves the rhythmic grid, so a metronome set to the scaled tempo lines up. For best results on percussive material, stay within about 0.6×-1.6×.
Speed up or slow down any video (0.25×–4×) and keep the original pitch — or let it follow the speed.
The other half of this engine: change key without touching the tempo.
Measure the original tempo so you know what 0.75× works out to.
Every in-browser audio tool built on the TuttiDAW engine.
Want to loop a two-bar phrase at 60% while you practice over it? TuttiDAW gives you clips, loops and warping - free, in your browser.
Explore TuttiDAW - the online audio workstation, no sign-up to start