What are Reverb & Delay?
Reverb (reverberation) is the collection of reflections that occur when sound bounces off surfaces in a space. When you clap in a large cathedral, the sound lingers and decays slowly — that's reverb. It adds depth, warmth, and a sense of space to audio. This tool generates reverb algorithmically by simulating the acoustic properties of different environments.
Delay is an echo effect that repeats the audio signal after a set time interval. Unlike reverb's blended reflections, delay produces distinct, separated repetitions. The feedback control determines how many times the echo repeats, while the mix control sets how loud the echoes are relative to the original sound.
How to Add Reverb & Delay
1. Upload Your Audio
Drag and drop or click to upload an MP3, WAV, FLAC, M4A, or AAC file (up to 250 MB). The file stays on your device — nothing is uploaded to a server.
2. Adjust Effects
Enable reverb and adjust the decay time, pre-delay, damping, and mix to shape your sound. Enable delay and set the time, feedback, and mix. Use the sliders to dial in the perfect effect blend.
3. Preview & Download
Click Play to preview your audio with effects applied in real-time. When you're happy with the sound, click Apply & Download to save it as a WAV file with the effects permanently baked in.
Reverb Controls Explained
Decay
Controls how long the reverb tail lasts (0.1s to 8s). Short values (under 1s) sound like a small room. Longer values (3s+) create expansive hall or cathedral-like spaces. Start around 1.5s for a balanced, natural reverb.
Pre-Delay
The gap between the original sound and when the reverb starts (0 to 100ms). Higher pre-delay separates the dry signal from the reverb, adding clarity. Low values blend the reverb smoothly with the source.
Damping
Controls the brightness of the reverb tail (1000 to 10000 Hz). Lower values produce a darker, warmer reverb — like a carpeted room. Higher values create a brighter, more metallic reverb — like a tiled bathroom or plate reverb.
Mix
Blends the wet (reverb) signal with the dry (original) signal. At 0% you hear only the original. At 100% you hear only reverb. For most uses, 20-40% adds space without drowning the source.
Common Use Cases
Music Production
Add space and depth to dry recordings. Use reverb to place instruments in a virtual room, and delay for rhythmic echo effects on vocals or guitars.
Podcasts
A touch of small room reverb can make podcast vocals sound warmer and more professional, removing the "closet recording" feel.
Sound Design
Create atmospheric soundscapes and cinematic textures. Long cathedral reverbs and rhythmic delays are staples of film and game audio design.
Practice & Rehearsal
Add reverb to backing tracks to simulate performing in a live venue. Delay can create harmonically interesting practice loops.
Reverb & Delay FAQ
What audio formats can I add reverb and delay to?
You can upload MP3, WAV, FLAC, M4A, and AAC files up to 250 MB. The processed output is downloaded as a high-quality WAV file with effects baked in.
Is my audio uploaded to a server?
No. Everything runs 100% in your browser using the Web Audio API. Your audio files never leave your device — no uploads, no server processing, complete privacy.
What's the difference between reverb and delay?
Reverb simulates the sound of a physical space — like a room, hall, or cathedral — by creating many blended reflections. Delay creates distinct echo repeats at a set time interval. Reverb sounds natural and ambient; delay sounds rhythmic and defined.
Can I use both effects at the same time?
Yes. You can enable both reverb and delay simultaneously. The audio passes through the delay first, then the reverb, creating a rich layered effect. Each has its own independent mix control.
Is this reverb and delay tool free?
Yes, completely free. No account required, no downloads, no watermarks. Just open the page, drop in your audio file, adjust the effects, and download.
What is an impulse response?
An impulse response (IR) is a recording of how a space responds to sound. This tool generates synthetic impulse responses using algorithms — simulating the acoustic properties of different rooms and environments without needing actual recordings.
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