Slowed and Reverb Maker

What slowed and reverb means

Slowed and reverb is an edit style where a song is played back at a lower speed and then soaked in reverb. Because the whole recording runs slower, the tempo falls and the pitch falls with it, much like a record spinning down on a turntable. Voices turn deeper and rounder, drums land with more weight, and the added reverb stretches every note into a soft tail. The result sounds dreamier, heavier and a little more distant than the original, which is why the style became a staple of late-night playlists, study mixes and short videos.

People search for the style under several names, such as slowed reverb, slowed plus reverb or simply slowed songs. They all point at the same recipe: lower the speed by roughly 10 to 20 percent, add a long reverb, and sometimes lift the bass slightly so the slower low end still feels full. This page does that in one step. You choose a file you already have, the tool processes it on your device, and you listen to the outcome before saving anything.

The tool does not download songs from streaming services and has no link box. It works only with audio files that are already on your phone or computer, so use tracks you made yourself or have permission to edit.

The four knobs and what each one changes

Speed runs from 50 to 100 percent and starts at 85. This is the control that creates the slowed character: at 85 percent a three-minute song grows to about three and a half minutes and drops roughly three semitones, which is close to the interval between A and F sharp. Moving to 75 percent gives a much darker, almost underwater feel, while 95 percent is a gentle nudge that many listeners barely identify as slowed.

Reverb sets how much of the reverberant sound is mixed in, from 0 to 100 percent, and begins at 45. Below 25 percent the effect reads as a little polish. Around 40 to 60 percent the dry vocal still sits clearly in front while a halo trails behind it. Past 80 percent the words start to blur into the tail, which suits ambient instrumentals more than sung lyrics.

Room size is the length of that tail, from 0.6 to 6 seconds, with 3 seconds as the starting point. A short room of about one second adds depth without smearing the rhythm. A long one of five or six seconds behaves like a cathedral: beautiful on sparse piano, messy on a busy drum pattern, because the previous beat has not faded before the next one arrives.

Bass adds between 0 and 12 decibels to the low end and starts at plus 2. Slowing a song shifts energy downward, so most tracks need little extra. Raise it only when the kick feels thin, and watch for distortion on laptop speakers. A limiter runs at the end of the chain so the loudest peaks do not clip when you stack reverb and bass together.

The four presets as starting points

Classic is the all-round setting: moderate slowdown, medium reverb, a long-ish room and a small bass lift. If you are unsure, begin there and turn one knob at a time. Dreamy leans further into the tail with a bigger room and more reverb, which flatters soft pop, lo-fi beats and anything with sustained synth pads.

Subtle keeps the edit close to the original. It suits a song whose vocal you want to stay intelligible, or a clip where the slowdown only needs to feel relaxed rather than dramatic. Heavy goes the other way, with a deeper slowdown and generous bass, and works for slow rap, trap and tracks built around a big low end.

Presets only move the knobs to new positions, so after tapping one you can keep adjusting. When you land on something good, use Copy settings link. The current values are stored in the page address, which means you can bookmark the recipe or send it to a friend, and they get the same starting point with their own file.

Why a slower song also sounds lower

Pitch is how many times per second a sound wave repeats. When playback slows, each wave takes longer to complete, so the number of repeats per second drops and the note sounds lower. The relationship is exact: halving the speed lowers everything by one octave, and every 6 percent change in speed is close to one semitone. The table in the Numbers tab lists the shift and the new length and tempo for each common speed, using a three-minute song at 120 beats per minute as the example.

That tie between speed and pitch is what gives the style its classic sound, so this tool keeps them linked on purpose. If you want the tempo to change while the voice stays at its original pitch, that is a different technique, explained on the audio speed changer page. If you want to move the key by a precise number of semitones without touching tempo, the pitch changer does that.

A useful rule: aim for a drop of two to four semitones. Less than two sounds like a mild tempo change. More than five starts to push singing voices into a range where they sound like a different person, and consonants lose their clarity once reverb is layered on top.

Choosing a source track that survives the treatment

Not every recording takes the style equally well. Songs with a clear vocal, a steady mid-tempo groove and some open space between phrases usually come out best, because the reverb tail has room to bloom before the next line begins. Dense, fast arrangements with constant cymbals or distorted guitars can turn into a wall of sound once the tail is added. Under the drop zone a short note repeats the rule: it works with audio files you have, and links from streaming sites cannot be opened.

Start from the best-quality copy you have. A lossless WAV or FLAC file gives the cleanest result, while a low-bitrate MP3 may reveal swirly compression artifacts when it is slowed down, since the slower playback stretches those flaws in time. If the only copy you own is small and rough, keep the reverb moderate so the flaws do not become the main event.

Your own productions are a natural fit. A bedroom beat, a demo vocal or a field recording often gains character from a slow, wet treatment, and there are no rights questions to worry about. For anything made by other people, only edit it if you have the right to do so.

Settings for common situations

For a mellow pop song you want to hear in the evening, try 85 percent, reverb near 50 and a 3-second room. The vocal stays readable and the tail fills the gaps between phrases. For a study mix, move to 80 percent, push the reverb toward 60 and lengthen the room to 4 seconds; the slower pulse and longer decay both soften the feel.

For hip-hop or R&B with a prominent kick, use 82 to 88 percent, keep reverb under 40 so the drums stay tight, and add 3 to 4 decibels of bass. For acoustic guitar or solo piano, a long room works well because there is space for the tail: try 90 percent speed with a 4 or 5 second room.

For a short video clip, think about the length too. Slowing a 30-second section to 80 percent makes it 37.5 seconds, so check the platform limit before you commit. Trim the section first with the audio trimmer if you only need the hook.

Mistakes that make the result muddy

The most common problem is stacking everything at once: strong slowdown, large reverb, long room and boosted bass. Each setting is fine alone, but together they fill the low mids with sustained energy and bury the vocal. Turn one knob, listen, then move to the next.

A second mistake is judging on tiny speakers. Phone speakers cannot play deep bass, so you may add too much and only notice on headphones. Use the Result and Original buttons to compare at the same moment of the track, and test on the device where listeners will actually hear it.

A third is starting with a source that is already heavily reverbed or low quality. Reverb on top of reverb turns to fog. A dry or lightly processed recording gives the cleanest outcome. Finally, keep playback volume moderate while auditioning; long reverb tails invite turning the level up, and loud headphone listening for hours is hard on your ears.

Saving, formats and file size

The tool reads MP3, WAV, M4A and AAC, OGG and Opus, FLAC and other formats your browser can decode, with files up to 250 MB. Saving offers MP3 at 128, 192, 256 or 320 kbps and WAV at 16-bit or 24-bit. Choose 320 kbps MP3 for sharing with a good balance of quality and size, or WAV when you plan to keep editing in another program. If the song you want lives inside a video you filmed, drop that MP4, MOV or WebM file in and the page uses its sound; what you save is still an MP3 or WAV.

The estimated size appears before you save. Because the slowed version is longer, the file is a little larger than the source at the same bitrate. The saved name is your original name with the tool name appended, so the original is never overwritten.

To keep working, use the Continue with the result links under the tool. The processed audio is passed to the next tool through the browser's own storage, so you can send it to the reverb tool for more echo, to the 8D tool for a circling effect, or to the speed changer to fine-tune the slowdown. If you want to stack more steps in one pass, the studio on the home page has a Slowed + reverb recipe you can extend.

Decoding, slowing, reverb and encoding all run on your own device, so the track never travels to a server. Closing the tab ends the session. The last file you opened stays in this browser's storage on your device to offer a shortcut in other tools; clearing site data removes it. Long files take longer on older phones, since the work is done by your own processor.