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Free · In-browser · No upload

Online Reverb Maker & Designer.

Design a deterministic synthetic impulse response, inspect the decay envelope, audition dry versus reverb, and export audio, IR WAV or a settings receipt — entirely in your browser.

Before-and-after illustration of Add Reverb: Dry recording becomes Reverberant render through Build reflections.
Before → process → afterSee the signal story, then hear it in the workspace.

TIME + SPACE MAP

Room Decay View

Trace the dry event into motion, repeats or ambience. The visual separates the direct sound from what arrives later, making timing, density, feedback and stereo movement easier to reason about.

Before-and-after illustration of Add Reverb: Dry recording becomes Reverberant render through Build reflections.
Dry recordingBuild reflectionsReverberant render
A time-domain field: one clear source event expands into controlled repeats, modulation or ambience before returning to the mix.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Dry recording

    Start with the right material

    Designing space around dry vocals, instruments, sound effects or ambient edits while keeping the exact signal choices visible.

  2. Build reflections

    Understand the transformation

    A seeded synthetic impulse is shaped by preset, pre-delay, decay, brightness and real early-reflection density, then convolved with the source for a source + IR - 1 wet render.

  3. Reverberant render

    Verify the usable result

    A dry or wet audio render, a stereo 48 kHz 16-bit impulse-response WAV, and a versioned JSON settings receipt.

Decay envelope

Where this workflow stops

The spaces are algorithmically generated approximations, not measured or sampled physical rooms. Sources are capped at 20 minutes and conservative render memory at 192 MiB on mobile or 384 MiB on desktop.

THREE-PASS CHECK

Make the final decision by ear

  • Judge timing against the rhythm rather than in solo.
  • Check whether the tail masks the next word, note or transient.
  • Audition mono and headphones when the effect uses stereo motion.

How to make reverb online

  1. Start with a room-style, hall-style, plate-style, cathedral-style or spring-style synthetic character.
  2. Set wet/dry mix, decay support, high-frequency damping, vocal-friendly pre-delay and early-reflection density.
  3. Read the deterministic impulse/envelope view and exact frame semantics before rendering.
  4. Optionally load a vocal, instrument or mix, render it, then switch between Dry A and Reverb mix B.
  5. Download the processed WAV or MP3, the stereo 48 kHz IR WAV, or a JSON settings receipt.

This online reverb maker uses Web Audio convolution with a deterministic, generated impulse response. The preset names describe design characters only: the IR is not sampled from, measured in or identified with a physical room. The same settings produce the same synthetic IR, including the actual early-reflection tap pattern and damping applied to the diffuse tail.

For vocal reverb, pre-delay can preserve word definition before reflections arrive, while damping can keep sibilants from building up. Decay support controls the exact generated IR duration; the displayed synthetic RT60 target describes the design envelope and is not a measured estimate or an acoustic measurement. For the slowed-down aesthetic version, the Slowed + Reverb tool combines both moves.

Add Reverb: quick answer and technical limits

Quick answer: A deterministic synthetic Reverb Designer with inspectable impulse evidence, dry/wet A/B and accountable render, IR WAV and settings exports.

Best for
Designing space around dry vocals, instruments, sound effects or ambient edits while keeping the exact signal choices visible.
How it works
A seeded synthetic impulse is shaped by preset, pre-delay, decay, brightness and real early-reflection density, then convolved with the source for a source + IR - 1 wet render.
What you get
A dry or wet audio render, a stereo 48 kHz 16-bit impulse-response WAV, and a versioned JSON settings receipt.

Know before you use it: The spaces are algorithmically generated approximations, not measured or sampled physical rooms. Sources are capped at 20 minutes and conservative render memory at 192 MiB on mobile or 384 MiB on desktop.

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

What does this online Reverb Designer create?
It creates a deterministic synthetic impulse response and can convolve it with audio in your browser. Room-style, hall-style, plate-style, cathedral-style and spring-style are designed characters, not recordings or measurements of named physical spaces.
What reverb settings work well for vocals?
A plate-style or short hall-style design is a practical starting point. Try 15-35 ms of pre-delay to separate the vocal from the reflections, then set decay by tempo and use damping if consonants become sharp. These are starting points, not rules.
What do pre-delay, decay, damping and reflection density change?
Pre-delay sets the silent gap before the first IR sample. Decay sets the exact supported tail length from 0.3 to 8 seconds. Damping low-passes late reflections, while early-reflection density changes the number and spacing of deterministic early taps in the impulse response.
How long is the rendered reverb tail?
For a wet mix, the output contains source frames plus impulse-response frames minus one sample. The IR contains the selected pre-delay followed by the selected decay support. At 0% wet, the output is exactly the source length and no silent tail is appended.
Can I export the impulse response and settings?
Yes. The designer exports a deterministic stereo 48 kHz, 16-bit PCM IR WAV and a JSON settings receipt with the local schema ID audiowrench.reverb-designer.receipt.v1. A loaded source can also be rendered to WAV or 320 kbps MP3.
Is this reverb maker free, and is audio uploaded?
Yes. It is free with no account or watermark. Selected audio and generated impulse responses stay in your browser; they are not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice.