Free LUFS Normalizer — YouTube & Spotify Loudness

LUFS (Loudness Units relative to Full Scale) measures perceived audio loudness as humans hear it — not just peak volume. YouTube's algorithm automatically reduces the volume of any video that exceeds -14 LUFS integrated loudness. This means an overly loud video sounds quieter than competitors after YouTube processing. By normalizing to exactly -14 LUFS before upload, your audio plays at the intended loudness without automatic volume reduction.

Yes — completely free with no sign-up, no account, no watermarks, no credit system, no file size limits, and no monthly usage caps. The tool processes audio locally in your browser.

EBU R128 is an international broadcasting standard (ITU-R BS.1770-4) for audio loudness. It uses K-weighting — a frequency filter that matches human hearing sensitivity — combined with gating (ignoring near-silent parts) to measure the 'integrated' perceived loudness of an entire file. This is more accurate than peak or RMS normalization for streaming delivery.

No. The algorithm applies a single linear gain to the whole programme — every sample is raised or lowered by the same factor to reach the target you picked (-14 LUFS for YouTube). A transparent true-peak limiter then holds the ceiling that platform asks for: -1 dBTP for YouTube and Spotify, -2 dBTP for Amazon Music and US broadcast, -3 dBTP for ACX audiobooks. Dynamics, EQ and character are preserved; only the overall level changes.

Yes. Drag multiple files or an entire folder into the upload zone. Files are processed one after another in a background worker — each file gets its own integrated LUFS measured separately and normalized individually to the target of the platform you selected.

Yes. After LUFS normalization finishes, an AI Silence Remover section automatically unlocks directly below your results. You can trim dead air and pauses with 1-click using the already-normalized audio — no re-upload required.

-14 LUFS is the standard target for YouTube and Spotify. -16 LUFS is used by Apple Podcasts. A -16 LUFS file is about 2 LU quieter than -14 LUFS. For YouTube content, target -14 LUFS. For Apple Podcast distribution, -16 LUFS is the delivery specification.

Auphonic is a cloud service that charges per audio hour after a limited free tier. Audio Forge Pro is completely free, 100% browser-based with zero uploads, and has no usage limits. Both normalize to streaming loudness standards, but Audio Forge Pro includes built-in AI silence removal — a feature Auphonic charges extra for.

No. The loudness normalization applies gain identically to all channels simultaneously, preserving stereo balance, panning, and channel relationships exactly as they were in the original recording.