How to Add Reverb to Audio (Free, Online)

To add reverb to audio for free, open the Vocal Cut Audio Reverb tool, drop in an MP3, WAV, FLAC or M4A file, and pick a preset: Room, Vocal plate, Hall or Cathedral. Press play to hear it, adjust the reverb amount while it plays, then export. The export is automatically lengthened to hold the reverb tail, so the last note fades out naturally and doesn't get cut off.

Everything runs in your browser. Your audio never leaves your device, and you don't need an account.

This guide treats reverb as a clean online reverb effect, the kind that gives a dry vocal or a single instrument a sense of space. If you're after the slowed-down, washed-out sound from TikTok and YouTube, that's a different recipe: see Slowed + Reverb and How to Make Slowed and Reverb Songs.

What you'll need

• An audio file: MP3, WAV, FLAC or M4A. A dry recording works best, meaning a vocal, guitar or voiceover recorded without much room sound. If you need to record one, the Audio Recorder works in the same browser tab.
• Headphones or decent speakers. Reverb tails are quiet, and laptop speakers hide most of them.
• A current desktop or mobile browser. Opus export only appears where the browser can encode it.

How to add reverb to audio online, step by step

1. Open Audio Reverb and drop your file onto the upload box, or click to browse.
2. Pick a preset. Hall is selected by default. Room, Vocal plate and Cathedral are one click away (there's a table of what each does below).
3. Press Play. Preview is live, so any slider you move while it's playing is heard straight away. You don't have to stop and re-render.
4. Set the Reverb amount. This is the wet/dry balance, from 0% to 100%. At 100% you hear only the reverb with none of the original signal. The tool uses an equal-power crossfade, so the overall level stays about even as you move the slider.
5. Fine-tune Decay time, Pre-delay and Brightness if the preset isn't quite right (details in the settings section).
6. Choose an export format. WAV is the default and is lossless. MP3 is smaller. Opus shows up only in browsers that can encode it.
7. Click Export. The button names the format, for example "Export WAV". The file comes out a little longer than the original: the tool adds the decay time plus the pre-delay to the end so the tail rings out in full.
8. Use Reset File if you want to load a different track.

The reverb is algorithmic. Its impulse response is generated in code from decaying noise, so there's no model or impulse-response file to fetch and no AI involved. Rendering is quick, though a long file with a long decay still takes a moment.

Choosing a reverb type: room, plate, hall or cathedral

Each preset sets three values at once. Here are the exact starting points:

Preset	Decay time	Pre-delay	Reverb amount	Good for
Room	0.6 s	5 ms	20%	Making a bone-dry recording sound like it happened somewhere real; podcasts, acoustic guitar
Vocal plate	1.4 s	25 ms	25%	Lead vocals in pop, R&B and rock; a smooth tail that doesn't swamp the words
Hall (default)	2.8 s	40 ms	30%	Ballads, piano, strings, slow pads
Cathedral	5.5 s	70 ms	40%	Ambient textures, choirs, dramatic intros, sound design

If you're not sure which to use, start with Vocal plate for a singer and Room for speech. Hall and Cathedral sound lovely on their own but get crowded quickly in a busy arrangement.

Wet/dry balance and the other settings

The Reverb amount slider matters most. As a rough guide:

• Lead vocal: about 15–25%. You should notice the space more when it's gone than while it's playing.
• Single instrument: 20–35%, depending on how far back you want it to sit.
• A full, finished song: very little. A mastered track already has its own reverb and dynamics baked in, and more on top washes everything together. If the mix already sounds cloudy, Why Your Mix Sounds Muddy explains why.

Decay time (0.3–8 s) controls how long the tail lasts. A longer decay sounds like a bigger space, and on a fast song it piles up between notes.

Pre-delay (0–150 ms) is the gap before the reverb starts. It's the setting that keeps a vocal intelligible: 20–40 ms lets the consonants land dry and the reverb bloom just after them, so the words stay at the front.

Brightness (1.5–16 kHz) filters the tail. Turning it down darkens the reverb, which helps tame hissing "s" sounds that get smeared across the tail. If sibilance is a problem even before reverb, deal with it first using the tips in How to EQ a Vocal.

Before exporting, check the result on phone speakers or in mono. Reverb that sounds subtle on headphones can disappear on a phone, and reverb that sounds huge on headphones is often too much everywhere else.

Reverb vs echo, and how to add both

People use the two words loosely, but they're different effects. Reverb is a continuous, smeared tail: thousands of reflections blurred into one wash of space. Echo is a set of distinct repeats you can count, like "hey… hey… hey". For repeats, use the Echo Effect tool.

If you want an echo reverb effect, adding both reverb and echo to the same audio is just a chain:

1. Run the file through one tool and export it as WAV.
2. Load that WAV into the other tool and export again.

Exporting WAV between the two steps avoids compressing the audio twice. Order changes the sound. Echo first, then reverb, puts every repeat in the same space and usually sounds more natural. Reverb first, then echo, repeats the whole wash and sounds more like an obvious effect.

When your source is a full song

You can add reverb to an MP3 of a finished song, and sometimes that's exactly what you want. But it's much less controllable than working on a single part, because the reverb hits the drums, the bass and the vocal equally. Low end with a long tail sounds muddy fast.

For more control, separate the vocal first with the Vocal Remover (the walkthrough is in How to Isolate Vocals from a Song), add reverb to just the vocal, then combine it with the instrumental again. That's also the usual way to give a home cover recording some polish. See How to Record a Cover Song.

Troubleshooting

• The ending sounds chopped off. This shouldn't happen with Audio Reverb, since the export adds the tail automatically. If you trim the file afterwards in another editor, leave a few seconds of silence at the end.
• The vocal sounds distant or the words are blurred. Lower the Reverb amount, raise Pre-delay to 25–40 ms, or switch from Hall to Vocal plate.
• The tail is hissy or harsh. Bring Brightness down a few kHz.
• Everything sounds muddy. The decay is too long for the tempo, or there's too much bass going into the reverb. Shorten Decay time, or treat a stem rather than the full mix.
• The recording already has too much room in it. Adding reverb can't fix that, and this tool can't remove reverb that's already in a recording. Re-record somewhere drier if you can.
• No Opus option. Your browser can't encode Opus. Use WAV or MP3.

Related task: Want the dreamy, slowed-down version instead? What Is Slowed and Reverb? explains the style, and Slowed + Reverb does the speed change and reverb in one tool. To bring a reverbed track up to release loudness afterwards, use Audio Mastering.

Frequently asked questions

Can I add reverb to audio online for free without uploading it? Yes. Vocal Cut's Audio Reverb processes the file inside your browser, so your audio never leaves your device. There's no account, no signup and no watermark. You drop in an MP3, WAV, FLAC or M4A file, choose a preset such as Vocal plate or Hall, preview it live, and export the result as WAV, MP3 or, in supporting browsers, Opus.

How much reverb should I put on vocals? For a lead vocal, a reverb amount of roughly 15 to 25 percent is a sensible starting point, with a pre-delay of 20 to 40 milliseconds so the words stay clear. The Vocal plate preset (1.4 second decay, 25 ms pre-delay, 25 percent mix) is built for exactly this. Turn it down until you barely notice it, then check that you miss it when it is switched off.

What is the difference between reverb and echo? Reverb is a continuous wash of blended reflections that makes a sound feel like it is in a room, hall or church. Echo is a series of separate, countable repeats of the sound. They can be combined: export from one tool as WAV, load that file into the other, and export again. Echo first, then reverb, usually sounds the most natural.

Why does my reverb get cut off at the end of the track? Many editors keep the output the same length as the input, so the reverb tail that continues after the last note is chopped off. Audio Reverb avoids this by automatically extending the export by the decay time plus the pre-delay. If you later trim the file in another program, leave a few seconds of silence after the final sound.

Can I remove reverb from a recording? Not with this tool. Audio Reverb only adds reverb. Reverb that was captured in the original recording is mixed into the sound itself and is difficult to take out cleanly. The best fix is to record in a drier space, for example closer to the microphone in a room with soft furnishings, and add controlled reverb afterwards.