Free online tool

Slowed Reverb App

No slowed reverb app to install. The free web editor runs in any phone or desktop browser with speed, reverb, bass, presets and MP3 export, and no account.

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.

There is no slowed reverb app to download here, and that is on purpose. The editor at the top of this page is the app. It runs in the browser you already have, on a phone, a tablet or a laptop, and it does what people search an app store for: slow a song down, drop the pitch, add reverb, shape the bass, and save the result as an MP3.

If you came from an app store search, the honest comparison is below. Most slowed reverb apps charge a subscription, add a watermark to free exports, cap the file length, or upload your song to a server to process it. This online editor does none of those things. The trade is that it lives in a browser tab instead of on your home screen, and that processing on a phone is slower than on a laptop. Both are covered on this page, including how to pin it to your home screen so it opens like a native app.

Platform specifics live on the Android page and the iPhone page. The phone workflow guide walks through a full edit on a phone screen.

What people expect from an app, and what the web editor gives

The one row where a native app can win is export format. If an app offers WAV export and you need WAV, that is a real difference. For YouTube, TikTok and Shorts uploads it is not, because those platforms re-encode everything to their own compressed formats. The export bitrate guide explains what actually reaches the listener.

How to use it like an app

1. Open slowandreverb.com in your phone or desktop browser.
2. Tap the editor to pick a file. On a phone this opens your Files app or file manager, where you choose an MP3, WAV, AAC, OGG or FLAC.
3. Tap a preset. Haze Chamber is deep and dark, Wave Drift is lighter, Dry is a blank slate.
4. Adjust Speed, Reverb, Space, Bass, Tone and Width with the sliders. Play to hear the change live.
5. Tap download. Your browser saves yourfile-remix.mp3 to its downloads location.

That is the whole flow. There is no sign-in step, no export screen with locked options, and no waiting for a server queue.

Add it to your home screen

Pinning the site gives you an icon that opens straight into the editor with no browser address bar. It is the same website, but it feels like an installed app.

Android, Chrome. Open the site, tap the three-dot menu in the top right, then tap Add to Home screen (on some versions it reads Install app or Add to Home Screen). Confirm the name and tap Add. The icon appears on your home screen or in your app drawer.

iPhone and iPad, Safari. Open the site in Safari, tap the Share button at the bottom of the screen (the square with an arrow), scroll down and tap Add to Home Screen, then tap Add in the top right. The icon appears on your home screen.

Desktop Chrome and Edge. Look for an install icon at the right end of the address bar, or open the browser menu and choose Install or Save and share, then Install page as app. It opens in its own window afterwards.

Custom presets you create are stored in the browser's local storage on that device, so they survive between visits whether you open the site from a tab or from the home screen icon. They do not sync between devices, because there is no account to sync through.

Processing time on a phone

Here is the honest part. A phone CPU is slower than a laptop CPU, and mobile browsers throttle tabs that go into the background or when the screen locks. On a laptop, a song renders and encodes faster than its own play time without you noticing. On a phone, the same song takes longer, long enough that you will see the progress. A full album batch on a phone is possible but it is a sit-and-wait job, and you should keep the screen on with the tab in front until the download appears.

None of this changes the result. The processing chain is the same code on every device, so a phone export and a laptop export of the same file with the same settings are identical. The only difference is how long you wait.

If you have both devices, use the phone for quick one-off edits and the laptop for batches. If you only have a phone, process a few tracks at a time and clear finished ones from the list to keep memory free. The bulk converter page has the detail on batch sizes.

What the web editor cannot do

Say it plainly so nobody is surprised. It does not export WAV or FLAC, only MP3 at 96 kbps, 32 kHz. It does not shift pitch independently of speed; pitch follows speed unless you turn Preserve pitch on, which holds the key still in the live preview only; exported files keep the speed-linked pitch. It does not chop, stutter, trim or add video. It cannot pull audio from a streaming service or a YouTube link; you need a file you already have. For live slowing of YouTube in a desktop browser there is a separate Chrome extension, which does not run on phones.

Settings that work on a phone screen

Sliders on a small screen are fiddly, so start from a preset and make small moves. These three starting points cover most songs.

Save your adjusted version with Create preset so the next song is one tap.