AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I add reverb or echo to audio online without uploading it?

Open AnyTool's Audio Reverb Effect, drop in your file, and pick a space — studio room, concert hall, plate, cathedral, spring or chamber — then dial wet/dry, decay, pre-delay, damping and stereo width while the convolution reverb changes in real time. Add a multi-tap or ping-pong echo, A/B dry vs wet in one click, and export WAV, MP3, M4A, OGG or FLAC with an anti-clip pass. Everything runs in your browser with the Web Audio API and a self-hosted ffmpeg engine — no upload, no watermark, no size cap, no CDN.

  • Room/hall/plate/cathedral reverb plus multi-tap and ping-pong echo
  • Live wet/dry, decay, pre-delay, damping and stereo-width controls
  • Instant dry-vs-wet A/B and a custom impulse-response (.wav) upload
  • 100% in your browser — no upload, no watermark, no size cap, no CDN

What is

Reverb

Reverb simulates the reflections of a physical space — a room, hall or plate — added to a dry recording. Convolution reverb applies a measured or synthesized impulse response (IR) for an authentic space character, while echo repeats the signal at set delay times. A client-side reverb tool processes and previews this in the browser with the Web Audio ConvolverNode, without uploading the file.

Audio Tools

Related terms

convolutionimpulse responsepre-delaywet/dryecho

How to Add Reverb to Audio

Add reverb and echo to an audio file in your browser.

30 secWeb browser
  1. 1

    Add audio

    Drop in any audio file — it stays on your device.

  2. 2

    Choose a space

    Pick a reverb space and adjust wet/dry, decay and pre-delay live while it plays.

  3. 3

    Export

    A/B dry vs wet, then download as WAV, MP3, M4A, OGG or FLAC — nothing is uploaded.

Result: An audio file with reverb

Frequently Asked Questions

No — reverb is added entirely in your browser.

The file never leaves your device and there is no 50 MB cap or watermark, unlike server-side or capped rivals such as AudioAlter (50 MB), freebeat (watermark + credits) or desktop editing apps (account).

Yes — every control updates the sound in real time.

A persistent Web Audio graph lets you scrub wet/dry, decay, pre-delay, damping and stereo width while it plays, with an instant dry-vs-wet A/B toggle — most rivals make you process then listen.

WAV, MP3, M4A, OGG or FLAC.

The render is encoded by a self-hosted ffmpeg engine with an anti-clip master pass, whereas SoundTools and Notevibes export MP3 only.

Detailed Explanation

Methodology

How the Audio Reverb Effect Works

AnyTool adds reverb entirely in the browser with the Web Audio API. A persistent graph splits the signal into a dry path and a wet path — pre-delay (DelayNode) into a ConvolverNode loaded with the chosen impulse response, then damping and tone biquads, wet gain and an optional echo (feedback or ping-pong delay) — summed through a stereo-width stage. Impulse responses are a small bundled pack of measured-style spaces (studio/hall/plate/cathedral/spring/chamber) plus a synthesized Moorer-style fallback, and you can drop in a custom .wav IR. Every control ramps live with setTargetAtTime, and a one-click dry-vs-wet A/B is gapless. Export rebuilds the graph in an OfflineAudioContext sized for the reverb tail, writes WAV, and a self-hosted single-threaded ffmpeg.wasm engine (bundled core, no CDN) encodes MP3/M4A/OGG/FLAC with an anti-clip alimiter/loudnorm pass.

  • Runs client-side — the audio is never uploaded
  • Web Audio ConvolverNode reverb with a bundled IR pack
  • Live wet/dry, decay, pre-delay, damping and stereo width
  • Multi-tap / ping-pong echo and custom-IR (.wav) upload
  • Self-hosted ffmpeg core (bundled) — no CDN
  • Export WAV/MP3/M4A/OGG/FLAC with an anti-clip pass
Privacy & Security

Privacy vs Cloud Reverb Tools

AudioAlter caps free files at 50 MB, freebeat adds a watermark and credits, desktop editing apps requires an account, and online video editors watermarks free exports. AnyTool adds reverb locally, so the file never leaves the browser, with no size cap, watermark or sign-up. SoundTools and Notevibes export MP3 only with a single amount slider, whereas AnyTool offers separate decay/pre-delay/damping/stereo controls, a real echo section, custom-IR upload and lossless plus four lossy export formats.

Reverb + echo: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Data handlingIn your browserOften uploaded
Live parametersYes (real-time)Often process-then-listen
Echo + reverbYes (both)Often reverb only
Custom IR uploadYesRare
Output formatsMP3/M4A/OGG/FLAC/WAVOften MP3 only

AnyTool is a privacy-first client-side reverb tool — processing runs locally and nothing is uploaded.