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

How do I make audio louder or normalize loudness without uploading it?

Open AnyTool's Audio Volume Booster, drop in your file, and drag the gain slider to hear the boost or cut instantly with a live clipping meter — zero encoding while you tune. For consistent loudness, run a true two-pass EBU R128 normalize to -14, -16, -19 or -23 LUFS with a true-peak limiter. It keeps your source format on export. Everything runs in your browser — no upload, no size cap, no CDN.

  • Instant Web Audio gain preview with a live clipping warning
  • True 2-pass EBU R128 loudnorm to -14/-16/-19/-23 LUFS + true-peak limiter
  • dB and % readouts; keeps your source format on export
  • 100% in your browser — no upload, no size cap, no CDN

What is

Audio volume normalization

Volume adjustment changes a track's gain (boost or cut), while loudness normalization targets a perceptual level such as -14 LUFS using EBU R128 two-pass analysis, often with a true-peak limiter to prevent clipping. A browser-based tool previews gain with a Web Audio GainNode and renders the final file locally with ffmpeg, without uploading.

Audio Tools

Related terms

LUFSEBU R128true peakgainffmpeg

How to Boost or Normalize Audio Volume

Adjust gain or normalize loudness in your browser.

15 secWeb browser
  1. 1

    Add audio

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

  2. 2

    Adjust or normalize

    Drag the gain slider (watch the clipping meter) or pick a LUFS normalize target.

  3. 3

    Export

    Download in your source format or a chosen one — nothing is uploaded.

Result: A volume-adjusted audio file

Frequently Asked Questions

No — it runs entirely in your browser with a self-hosted engine.

The file never leaves your device and there is no size cap, unlike MP3Louder/AudioAlter/123apps (server upload) or WUTools/Verbatik (50–100 MB caps).

Yes — a Web Audio preview applies the gain instantly as you drag.

The boost or cut is audible the moment you move the slider, with a live clipping badge if the level exceeds 0 dBFS; encoding only happens on download.

Yes — a true 2-pass EBU R128 normalize to -14/-16/-19/-23 LUFS.

It measures the file, then applies a linear loudnorm to your chosen LUFS target with a true-peak limiter, more accurate than peak-only or single-pass competitors.

Detailed Explanation

Methodology

How the Audio Volume Booster Works

AnyTool adjusts loudness in two stages, all in the browser. Tuning is instant and encode-free: the file is decoded with the Web Audio API and played through a GainNode whose value tracks the slider (gain = 10^(dB/20)), with an AnalyserNode driving a live clipping meter when the post-gain peak exceeds 0 dBFS. Export uses a self-hosted single-threaded ffmpeg.wasm engine (bundled core, no CDN): a manual boost applies -af volume=<N>dB (optionally with an alimiter true-peak guard), and normalize runs a true two-pass EBU R128 loudnorm — pass one measures integrated loudness, true peak and LRA, pass two applies a linear loudnorm to a selectable target (-14, -16, -19 or -23 LUFS). Output preserves the source format or can be MP3/WAV/OGG/M4A.

  • Runs client-side — the audio is never uploaded
  • Self-hosted ffmpeg core (bundled) — no CDN
  • Instant GainNode preview with live clipping meter
  • True 2-pass EBU R128 loudnorm (-14/-16/-19/-23 LUFS)
  • True-peak limiter to prevent clipping
  • Preserves source format or MP3/WAV/OGG/M4A
Privacy & Security

Privacy vs Cloud Volume Tools

MP3Louder, AudioAlter (50 MB) and 123apps upload your file to a server, and WUTools/SoundTools (50 MB; 20–40s per change) make you wait for a full re-encode with no live preview. AnyTool tunes in real time on the device and renders locally with a bundled engine, so there is no size cap, watermark or sign-up, and it works offline after the first load. Its correct 2-pass linear loudnorm is more accurate than peak-only or single-pass competitors.

Volume + loudness: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Data handlingIn your browserOften uploaded
Live previewInstant (GainNode)Re-encode per change
Loudness normalize2-pass EBU R128Peak/single-pass
Clipping protectionTrue-peak limiterRare
Watermark / capNoneCommon

AnyTool is a privacy-first client-side volume booster/normalizer — processing runs locally and nothing is uploaded.