How to make slowed and reverb.
Turn any track into that hazy, slowed-down, echo-soaked sound that took over TikTok and YouTube — free, right in your browser, with nothing uploaded.
🌊 Open the Slowed + Reverb tool →What "slowed and reverb" actually means
A slowed and reverb edit does two simple things at once. First, it plays the song back slower — usually somewhere between 65% and 85% of the original speed. Because the playback rate drops, the pitch drops with it, giving voices and instruments that warm, melted, half-asleep quality. That isn't a bug; it is the aesthetic. Second, it drowns the result in reverb so everything feels spacious and far away, like the song is playing in an empty hall at 2 a.m.
The style has a few cousins you'll hear in the same corners of the internet: Vaporwave (slower still, heavier reverb) and Nightcore Reverse (a lighter, more nostalgic take). Learning how to make slowed and reverb really just means learning how to balance those two dials — speed and space — against each other.
How to make slowed and reverb, step by step
The Slowed + Reverb tool is built around exactly this workflow. Here's the whole flow:
- Drop your song in. Drag an audio file onto the dropzone, or click to browse. The track is decoded on your device and appears as an "Original" player so you can hear the source before you touch anything.
- Pick a preset. Tap one of the preset chips — 🎵 TikTok Slowed, 🌙 Nightcore Reverse, 🌴 Vaporwave, or 🎛️ Custom. Each one instantly sets a sensible speed and reverb amount so you're starting from a sound, not a blank slate.
- Fine-tune the sliders. Adjust Speed (from 50% up to 100%), Reverb amount (how wet and washed-out it gets), and Reverb size (how long the echo tail rings out, up to several seconds). Moving any slider automatically switches you to the Custom preset so your tweaks stick.
- Apply the effect. Hit ✨ Apply effect. The tool renders the whole track offline at your chosen speed, adds the reverb tail, and normalizes the level so it isn't too quiet.
- Preview. Press play on the "Processed" player to hear the slowed and reverb version. If it's not quite there, nudge the sliders and apply again — re-rendering is quick.
- Download. Export as MP3 (small, ready to post) or WAV (lossless, ready to edit further). The file saves straight to your device.
Settings that get you the right vibe
If you're not sure where to land, these are reliable starting points:
- Classic TikTok slowed: ~80% speed, ~40% reverb. Recognisable but still clear and danceable.
- Full Vaporwave: ~65% speed, ~60% reverb, a longer reverb size. Slow, woozy and very atmospheric.
- Nightcore Reverse: ~75% speed with lighter reverb — slowed, but airier and less drenched.
A good rule of thumb: the slower you go, the more reverb you can get away with, because the extra space fills the gaps a slower tempo leaves behind. If vocals start to smear into mush, pull the Reverb amount or Reverb size back a touch — you want atmosphere, not soup.
🌊 Try the Slowed + Reverb tool (free) →
Why do it in your browser?
Most "slowed and reverb generator" sites make you upload your song, sit through ads, or sign up before you can download anything. SoundForge does none of that. The Slowed + Reverb tool runs entirely on your device using the browser's built-in Web Audio API. Your file is decoded and processed locally — nothing is uploaded, there's no account, and it's completely free. When you close the tab, the audio is gone from memory. That makes it faster (no upload wait), private (your unreleased demo never leaves your laptop), and reliable on big files.
A few tips for a cleaner result
Start from the best source you have: a clean MP3 or WAV slows down far more nicely than a quiet, already-compressed clip. If you only want a snippet for a video, trim the track first with the Trimmer, then bring the short clip in so you're not rendering minutes you'll never use.