Loudness Normalizer
Drag & drop your files
or
Accepted: MP3, WAV, M4A, FLAC, OGG, AAC, OPUS, AIFF, AMR, APE, MP4, MOV, MKV, AVI, WEBM, FLV, M4V
How to use Loudness Normalizer
- 1
Upload your audio or video
Drop an MP3, WAV, M4A, MP4, MOV, or any common media file.
- 2
Pick a target loudness
Choose the platform your file is destined for.
- 3
Download the normalised file
Ready for delivery.
Frequently Asked Questions
- What is LUFS?
- Loudness Units Full Scale — the broadcast industry standard for measuring perceived loudness. Every major streaming platform normalises to a specific LUFS target.
- Why does my track get quieter on Spotify?
- Spotify normalises everything to -14 LUFS. If your file is louder than that, it gets turned down. If it is quieter, Spotify turns it up — but you lose headroom. Aim for -14.
- What about true peak?
- True peak prevents inter-sample distortion during playback. Most platforms recommend -1 dBTP or lower.
- Does it work on video files?
- Yes. Video is copied untouched; only the audio is normalised.
- Is two-pass mode available?
- Not yet. Single-pass is accurate enough for streaming delivery. Two-pass (measure then apply) is planned.
Why Loudness Normalisation Matters
Every streaming platform normalises playback. If your podcast or track is louder than the platform's target, they turn it down — you lose dynamic range for nothing. If it is quieter, they turn it up, and you lose headroom to noise. Loudness normalisation fixes this once, correctly, using the EBU R128 standard.
Targets by Platform
- -14 LUFS — Spotify, YouTube, Amazon Music, Tidal
- -16 LUFS — Apple Podcasts, Apple Music
- -18 LUFS — General web streaming, personal sites
- -23 LUFS — Broadcast television and radio (EBU R128)
True Peak and LRA
True peak (dBTP) is a more accurate measurement than dBFS for digital audio — it catches inter-sample peaks that cause distortion on some playback systems. Most mastering engineers keep true peak at -1 dBTP.
Loudness range (LRA) controls how much dynamic variation the normaliser allows. Low LRA values (6–8) suit pop and spoken word. High LRA values (11–15) suit classical and jazz.
How the Filter Works
Our tool runs FFmpeg's loudnorm filter, the same algorithm used by professional mastering suites. It measures the integrated loudness of your file and applies dynamic adjustment to hit the target.
Why Dayront?
- No uploads — your unreleased masters never leave your device.
- Runs locally in your browser via WebAssembly FFmpeg.
- Free, unlimited use, no account.