How to make a slowed + reverb song
- Drop an audio file on the box: MP3, WAV, M4A, OGG or FLAC.
- Choose a preset: Slowed + reverb, Super slowed, Nightcore or Sped up, or set the sliders yourself.
- Press Preview to listen. Changes apply when you let go of a slider.
- Download as WAV (best quality) or MP3 to share or upload.
How the effect works
The "slowed + reverb" sound that took over TikTok and YouTube is made by slowing a track down like a record played at a lower speed, which lowers the pitch at the same time, then adding a large, washy reverb and a little extra bass. At 85% speed, a song sounds about 2.8 semitones lower and 18% longer; "super slowed" versions use around 70%. Nightcore does the opposite: faster and higher. Changing speed and pitch together is deliberate here, because it gives the dreamy, heavy character that pitch-preserving time-stretching does not.
The reverb is a convolution reverb with a generated impulse response: decaying stereo noise whose length is set by Room size. Reverb mixes the original (dry) and reverberated (wet) signals; more reverb pushes the vocals further back. The final file is rendered with the Web Audio API's offline renderer, so it is processed faster than real time.
Your audio never leaves your device. Respect copyright when you share edited versions of other artists' songs.
How do I make a song slowed without changing the pitch?
This tool slows like a turntable, so pitch drops too, which is the classic slowed + reverb sound. Pitch-preserving stretching needs a different algorithm.
Why is the MP3 option not working?
The MP3 encoder is loaded from a CDN when you first use it. If you are offline, download WAV instead.
What is nightcore?
A style where songs are sped up (usually 115–130%) and pitched higher, often with little reverb.