Free online tool

Slowed Reverb Maker

Make a slowed + reverb version of any song in your browser. Speed, reverb mix and decay, bass, tone and width, then export MP3 or a ZIP. Free, nothing is uploaded.

Open the free editor: upload MP3, WAV, AAC, OGG or FLAC, adjust speed, reverb, bass, tone, width and space, then export MP3 or a ZIP of many tracks. Everything runs in your browser.

A slowed reverb maker does two things to a song: it plays it back slower, which also drops the pitch, and it adds a reverb tail so the sound feels like it is coming from a large, distant room. That is the entire recipe behind the "slowed + reverb" style you hear on YouTube and TikTok. This page is the tool, plus everything you need to know to use it well.

The editor above runs completely in your browser. Your file is decoded locally with the Web Audio API, processed locally, and encoded to MP3 locally. Nothing is sent to a server, there is no account, and there is no queue.

How to make a slowed reverb edit

1. Add your audio. Drop an MP3, WAV, AAC, OGG or FLAC file onto the editor, or click to pick one. You can add several files at once if you want to process a batch.
2. Pick a starting preset. Haze Chamber is the classic deep slowed sound (0.85x, 54% reverb, heavy bass, dark tone, wide stereo). Wave Drift is lighter and cleaner (0.90x, 50% reverb). Dry resets everything so you can build from scratch.
3. Set the speed. The Speed slider goes from 0.50x to 1.50x. Most slowed edits land between 0.78x and 0.90x. Below 0.75x vocals start to smear unless the source is very clean.
4. Dial in the reverb. Reverb is the wet mix, 0 to 100%. Space is the decay time, 1.2 to 6.0 seconds. A long Space with a low Reverb gives a distant, airy sound. A short Space with a high Reverb sounds like a small, wet room.
5. Shape the tone. Bass (-6 to +12 dB) adds weight. Tone (-10 to +10 dB) darkens or brightens the top end. Most slowed edits sit around +4 to +8 dB bass and -3 to -6 dB tone.
6. Widen if you want. Width from 0 (mono) to 1.5 (wider than the original). Around 1.1 to 1.3 feels big on headphones without collapsing on phone speakers.
7. Preview, then export. Press play. With Preserve pitch off, the preview is the same signal chain as the export, so what you hear is what you get; with it on, the export will be pitch-shifted. Click download for one MP3, or select several tracks and download a ZIP.

Recommended settings

These are starting points that work on most pop, rap and R&B sources. Adjust by ear.

If the lyrics turn to mud, lower Reverb before you touch anything else. If the track feels thin after slowing, add Bass in 2 dB steps. If cymbals and S sounds get harsh, pull Tone down.

Preserve pitch: on or off?

Off is the traditional slowed + reverb sound. Slowing the track lowers the key, and that lower, heavier voice is a big part of why the style works. Leave it off for a classic edit.

Turn it on when you want the song slower but in its original key. That is useful for practice tracks, for dance edits where the tempo matters more than the mood, or when a singer's voice gets too deep to feel natural. Pitch-preserved playback uses the browser's time-stretch, which can add a slight warble at extreme speeds, so stay above 0.70x with it on. Preserve pitch changes the live preview only; exported files keep the speed-linked pitch, so for an in-key file use Audacity's Change Tempo or a DAW.

Why the slowed + reverb style works

Slowing a recording stretches every transient and lowers every frequency. Drums hit softer, vocals sit lower in the chest, and the mix has more room between notes. Reverb fills that room with reflections, which the ear reads as distance and size. Together they turn a bright, present pop record into something that sounds remembered rather than heard. That is the nostalgia effect people describe.

The style grew out of Houston's chopped and screwed scene in the 1990s, where DJ Screw slowed records on a turntable. It came back in the late 2010s as "slowed + reverb" uploads on YouTube, then spread to TikTok where slowed versions of songs often outperform the originals as background audio. Today labels release official slowed versions as singles because the demand is measurable.

What this tool does and does not do

It does: speed and pitch change, convolution reverb with adjustable decay, bass and tone shelving, stereo width, per-track settings, batch processing with shared settings, custom presets saved in your browser, MP3 export, ZIP export for multiple files.

It does not: upload your audio anywhere, require an account, add a watermark, limit how many files you process, or export WAV. Export is MP3 at 96 kbps, 32 kHz, which is tuned for fast in-browser encoding and is fine for YouTube, TikTok and Shorts, where the platform re-encodes your audio anyway. If you need a lossless master for distribution, process a WAV source and bounce the final from a DAW.

Bulk processing

Add several tracks, click Select All Tracks, and any change you make applies to every selected track. You can also select a subset and give those their own settings, then select another group. Download All renders each track in sequence and gives you one ZIP. People running slowed channels use this to turn an album into a full upload batch in one sitting. See the bulk slowed reverb converter page for the full workflow.

Custom presets

Once you find a sound you like, click Create preset, give it a name, and it appears next to the built-in presets. Presets are stored in your browser's local storage, so they persist between visits on the same device without an account. Clearing site data removes them.

Tips from heavy users

• Start from a lossless or 320 kbps source. Slowing a low-bitrate MP3 exposes its artifacts because every flaw gets stretched.
• Match your Speed across an album so the batch sounds like one project. 0.82x to 0.85x is the common sweet spot.
• Check on phone speakers. Heavy Bass and wide Width that sound great on headphones can collapse on a phone. A quick listen catches it.
• Keep a "clean" preset at 0.88x and 30% reverb for songs with dense vocals, and a "deep" preset for instrumentals and sparse arrangements.
• Export once, then trim and cut your Shorts from the exported file rather than re-exporting each clip.