01
Load a track
Drop MP3, WAV, FLAC, AAC, M4A or OGG, or choose a file from Your Library. Decoding runs locally.
Slowed + Reverb
Slow a track down and add a dreamy reverb tail — the classic social edit. Preview live, then download.
Drop an audio file here
or click to choose from your computer
MP3 · WAV · FLAC · AAC · M4A · OGG
0.8×
One-click vibes
55%
Original: — New duration: —
0:000:00
Working…
Local processing in your browser · Files are not uploaded to our servers
What is the Slowed + Reverb?
Slowed + Reverb is a popular edit style: reduce the playback speed of a song and wrap it in a soft reverb tail so the track feels dreamier, heavier, and more atmospheric. You hear it constantly on TikTok, YouTube, and SoundCloud — often under late-night, study, or “aesthetic” videos. Sound Booster recreates that sound in the browser: change speed (and pitch with it), set reverb amount, preview, then download a WAV with the effect baked in.
Technically this tool uses resampling for speed. Slowing to ~0.8× lowers pitch slightly and stretches duration; speeding up does the opposite. That classic “tape” behaviour is what most social slowed edits use. Reverb is a delay-based ambience mixed under the dry signal so tails bloom without burying the vocal completely — you can still push it higher for a washed-out look.
One-click vibes cover the common targets: Slowed + Reverb (~0.8× + reverb), Nightcore (~1.3×, brighter and faster), Slowed without much space, Sped Up, and Original to reset. Everything stays on your device — nothing is uploaded to our servers.
How it works
02
Pick a vibe or fine-tune
Hit Slowed + Reverb, Nightcore, or set Speed and Reverb sliders yourself. Watch original vs new duration update.
03
Preview and export
Play the effect, A/B with Original, then Download a WAV with speed and reverb rendered in.
Reverb is mixed under the dry path so the core performance stays readable. If you only need speed without space, set Reverb to 0% or use the Speed Changer tool. For pitch changes without tempo shift, open Pitch Shifter with preserve tempo enabled.
Common use cases
Social edits
Build the classic slowed + reverb clip for short-form video in one pass.
Nightcore variants
One click raises speed (~1.3×) for a brighter, faster nightcore-style take.
Practice & study
Slow to 0.5×–0.75× to learn lyrics, lines, or language audio more easily.
Sound design
Half-speed loops with reverb make useful pads and textures for sketches.
Frequently asked questions
How do I make slowed + reverb?
Load a file, click the Slowed + Reverb vibe (or set about 0.8× speed and raise Reverb), preview, then Download. The default settings give the familiar dreamy sound, and you can adjust the speed and reverb sliders while you listen. Use the Original button to compare the edit with the source before you export.
Does pitch change with speed?
Yes. Resampling links pitch and tempo — the familiar tape-style effect used in most social edits. At about 0.8× the track drops by nearly four semitones and gets longer, which gives it a heavier mood. If you want to restore the original key, run the exported file through the Pitch Shifter with Preserve tempo.
How do I make nightcore?
Click the Nightcore vibe (about 1.3×). Tweak speed if you want it faster or slower, then export. The result is faster and higher-pitched with a lighter reverb. For presets and more detail about that style, the dedicated Nightcore Maker offers Soft, Classic and Hyper settings.
Is my file uploaded?
No. Processing and download run entirely in your browser. The speed change, reverb and WAV render are done on your device, so your song is not sent to Sound Booster servers. Saving the result to Your Library is optional and separate from the edit.
What is the output format?
WAV by default (lossless), which keeps the reverb tail clean but makes a larger file. The output menu also offers MP3 options if you prefer a smaller download. You can also convert further with the Audio Converter if you need another format.
What settings give the classic slowed + reverb sound?
A good starting point is about 0.8× speed with the reverb around the middle of its range, which is what the Slowed + Reverb vibe sets. From there, move the speed between roughly 0.75× and 0.85× and adjust reverb by ear. Heavier vocals usually need a little less reverb, while sparse instrumental tracks can handle more.
Why does my reverb sound too washed out?
Too much reverb on a busy or vocal-heavy track smears words and pushes the performance into the background. Lower the Reverb slider, or set it to 0% if you only want the slowdown. Start low and increase it until the tail blooms after phrases without covering the next one.
How slow is too slow?
Speed goes well below the usual range, but below about 0.7× most songs start to drag and vocals become hard to follow, with a very deep pitch. For social edits, 0.75× to 0.85× is common. Use the duration readout to see how long the track becomes and listen to a chorus at your chosen speed.
Can I post my slowed + reverb edit on social media?
The tool does the audio processing, but rights to the music are separate. Using a copyrighted song may lead to muted audio or takedowns on some platforms, depending on their rules and the licence. Use tracks you own, have permission for or that are licensed for edits, and check the platform’s music policy.
How can I keep the original pitch while slowing a track?
This tool changes speed by resampling, so pitch follows speed. To bring the key back up afterwards, export the file and open it in the Pitch Shifter with Preserve tempo on, then raise it by about four semitones for 0.8× speed. The result is slower, but closer to the original key.
Related tools
Keep editing with other browser-based tools on Sound Booster.