Auto Volume Normalizer

Automatically raises quiet audio, compresses loud passages, limits peaks and tunes tone with a 7-band equalizer on web pages.

You know the pain: a quiet movie dialogue forces you to crank the volume, then an explosion or loud ad blasts your ears. YouTube, X (Twitter) Audio Space, Twitch, news sites, podcasts — they all have wildly inconsistent audio levels. Auto Volume Normalizer fixes this automatically. It runs locally in your browser, uses the Web Audio API to measure loudness in real-time, and smoothly adjusts gain so everything sits at a comfortable level. No cloud, no tracking, no subscriptions — just a tiny extension that works. Auto Volume Normalizer automatically balances audio levels on any web page. No more reaching for the volume knob when quiet dialogue is followed by loud explosions. FEATURES • Smart gain control — raises quiet passages to a target level without blowing out loud sections • Dynamics compressor — optional smoothing of sudden loud transients (claps, gunshots, ads) • 6 built-in presets — Balanced, TV/Movies, Music, Speech, Night Mode, Maximum Leveling • Real-time debug panel — Ctrl+Shift+V shows live RMS, gain, element count • Adjustable attack/release — fine-tune how fast the volume adapts • Max boost limit — prevents amplifying background noise • Works everywhere — YouTube, Twitch, Netflix*, news sites, podcasts, embedded players • Zero config required — sensible defaults work out of the box • Privacy-first — no data collection, all processing local *Netflix and DRM-protected players limited by browser security. HOW IT WORKS The extension uses the Web Audio API to build a real-time processing graph for each <audio> and <video> element: 1. Measures RMS loudness via AnalyserNode 2. Applies automatic gain compensation via GainNode 3. Optionally compresses peaks via DynamicsCompressorNode SETTINGS • Target volume (-30 to -6 dB) — desired output level • Max boost (0 to +30 dB) — safety ceiling for quiet audio • Attack (20–250 ms) — response to quiet sections • Release (150–1500 ms) — recovery from loud sections • Compressor — toggle peak smoothing PRESETS Balanced (-18 dB, +15 dB, 60/500 ms) — General use TV / Movies (-14 dB, +24 dB, 30/400 ms) — Streaming (EBU R128) Music (-16 dB, +12 dB, 50/600 ms) — Preserves dynamics Speech (-10 dB, +20 dB, 20/300 ms) — Podcasts, dialogue Night Mode (-24 dB, +18 dB, 80/800 ms) — Quiet viewing Maximum (-6 dB, +30 dB, 20/300 ms) — Aggressive leveling GRAPHIC EQUALIZER - 7-band graphic equalizer - Peaking bands at 60/150/400/1k/2.4k/6k/15k Hz - Presets (Flat / Bass Boost / Vocal / Treble)