Slowed + Reverb
Slow any song down and drench it in dreamy reverb for that nostalgic, lo-fi sound — right in your browser, free
Frequently Asked Questions
Everything you need to know about making slowed + reverb songs.
Slowed and reverb (also written "slowed + reverb") is a remix style that slows a song down and adds reverb so it sounds spacious, dreamy and nostalgic. Born from the chopped-and-screwed and lo-fi scenes, it became a viral trend on TikTok and YouTube. KeyPitch lets you create the effect on any track in your browser — no software to install.
Upload your MP3, WAV, M4A or MP4 file to KeyPitch, then tap the "Slow + Reverb" pad for the classic sound — it sets the speed to ×0.80, reverb to 51% and the key to −3 semitones. Prefer to dial it in yourself? Drag the Slowed, Reverb and Key sliders. Preview the result, then click Download to open it in the KeyPitch Audio Studio and export.
"Slowed" means the song's tempo is reduced, usually to around 70–90% of the original speed, so it feels heavier and more emotional. "Reverb" adds a sense of space and echo, as if the track is playing in a large room. Together they create the soft, hazy, nostalgic atmosphere that defines the genre.
Slowing a song down and adding reverb makes it feel intimate and nostalgic, which pairs perfectly with moody, aesthetic and "core" video edits. The dreamy, lo-fi vibe triggers a powerful sense of memory and emotion, so creators use slowed + reverb versions to give familiar songs a fresh, melancholic feel that keeps viewers watching.
Most slowed + reverb edits sit between ×0.75 and ×0.90 of the original speed. Around ×0.80 — the KeyPitch "Slow + Reverb" preset — is the classic sweet spot: slow enough to feel dreamy but still musical. Go down toward ×0.75 for a heavier, more dramatic vibe, or stay near ×0.90 for a subtle, barely-slowed feel.
A reverb level of about 45–55% gives the signature spacious, washed-out sound without burying the vocals — the "Slow + Reverb" preset uses 51%. Add more for a deeper, more ambient feel, or less if you want the lyrics to stay crisp. Preview as you adjust — the right amount depends on how busy and bright the original track is.
They are closely related but not identical. Lo-fi is a broad aesthetic built on warm, imperfect, relaxed sound. Slowed + reverb is a specific technique — taking an existing song, slowing it down and adding reverb — that lives inside the same chilled, nostalgic family. Many people use slowed + reverb to give pop or rap tracks a lo-fi feel.
Yes. Upload an MP4 video and KeyPitch applies the slowed + reverb effect to its audio while keeping the picture in sync, so you can export a ready-to-post clip for TikTok, Instagram Reels or YouTube Shorts. You can also upload just the audio (MP3, WAV or M4A) if you only need the sound.
Traditionally, yes — and it is a big part of the sound. Slowing a tape or vinyl record down also drops the key lower, giving that deep, warm slowed character. Historically the two were tied together because older tools couldn't separate key from speed: change one and the other moved with it. KeyPitch decouples them, so you have full control. By default you can slow a song without changing its key, keeping vocals clean — or deliberately lower the key for the classic deep sound. That is why the "Slow + Reverb" preset lowers the key by 3 semitones, and you can fine-tune it any time with the Key slider.
They are opposites. Slowed + reverb makes a song slower and dreamier, while nightcore speeds it up and raises the key for an energetic, high-tempo sound. A slowed-down version is sometimes called "daycore". With KeyPitch you can make either — slow a track down here, or open the Audio Studio to speed it up instead.
Yes. You can upload a song, apply slowed + reverb and preview it for free, with no signup. The full Audio Studio adds extra controls — fine speed and reverb tuning, key, bass boost, 8D audio and more — for the perfect export.
KeyPitch accepts MP3, WAV, M4A and MP4 files up to 50 MB and 10 minutes long. Once your slowed + reverb track is in the Audio Studio, you can export it as MP3 or WAV — or as an MP4 if you uploaded a video.
Yes. KeyPitch runs entirely in your mobile browser, so you can make a slowed + reverb edit on an iPhone or Android phone with no app download. Upload from your device, tap the effect, preview and download — perfect for creating TikTok and Reels audio on the go.
No. KeyPitch uses high-quality time-stretching and convolution reverb, so slowing a song down stays smooth and clean rather than choppy. For the best result, start from a WAV or high-bitrate MP3 source and keep the reverb at a moderate level so the mix stays clear.
Editing a song for your own private listening is generally fine. Publishing or monetising a slowed + reverb version of copyrighted music may require permission from the rights holder, and platforms like YouTube and TikTok have their own content rules. When in doubt, use tracks you own or that are licensed for remixing.
Once you are happy with the preview, click "Download your slowed + reverb track". The file opens in the KeyPitch Audio Studio with your speed, reverb and key settings already applied, where you choose the format and export the finished song to your device.