Audio Volume & Normalizer – Adjust dB or EBU R128 Online (Free)
Free online audio volume and normalizer. Apply manual gain (−30 to +30 dB) or auto-normalize to the EBU R128 broadcast loudness target (−16 LUFS). Runs locally via FFmpeg WASM.
Example Output
Audio brought up to professional broadcast loudness without clipping. Listeners no longer need to crank their volume.
quiet-recording-normalized.wav (target −16 LUFS, broadcast-ready)
What is Audio Volume / Normalizer?
Adjust audio loudness with either a precise dB slider or a one-click EBU R128 normalization to the broadcast standard. Manual mode is great for small tweaks; normalize mode automates the calculation — calculate the integrated loudness, scale to −16 LUFS, and apply True Peak limiting so nothing clips. Same algorithm pros use in podcast post-production.
Why use this tool?
- Open-and-go: bookmark the page once and never look for an alternative
- Instant results — no waiting on a server or upload progress bar
- Touch-friendly UI, fine on phones for on-the-go edits
How to use
- Upload an audio file
- Pick Manual gain (slide −30 to +30 dB) or Auto-normalize EBU R128
- Choose output format
- Click Apply Gain / Normalize and download
Examples
Voice memo too quiet
A phone voice memo recorded at low input level is brought up by +12 dB so it's comfortably audible without headphones.
Podcast normalization
A 10-episode podcast batch gets normalized to −16 LUFS so each episode plays at the same loudness in listener apps.
Music mastering finish
A self-produced track is normalized to −14 LUFS (Spotify's target) for distribution-ready loudness.
Common use cases
- Bringing quiet voice memos up to listenable level
- Podcast and broadcast loudness compliance
- Matching loudness across multi-source content
- Self-released music loudness targeting
- Audiobook chapter consistency
Troubleshooting
- Audio sounds distorted after applying big gain
- You're clipping. Use auto-normalize instead — it applies True Peak limiting. Or reduce the gain value until distortion goes away.
- Normalize made it quieter, not louder
- Source was already louder than −16 LUFS. The algorithm brings loud audio DOWN as well as quiet audio UP — that's by design.
- Files still sound different after normalize
- EBU R128 measures integrated loudness across the whole file. If one file has quiet stretches and loud peaks vs another with steady volume, perceived loudness can still differ. Use dynamic-range compression first for highly variable content.
Frequently Asked Questions
Use manual gain (+6 dB ≈ 2× louder) when you know exactly how much louder you want it. Use EBU R128 normalize when you have multiple files and want them all to sound similarly loud — same standard Spotify, Apple Podcasts and YouTube target.
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