How to Normalize Audio: LUFS & dBFS Explained
You know the problem: you're listening to a podcast and constantly adjusting the volume because the speaker alternates between too loud and too quiet. Or your music production sounds great in the car but flat on a smartphone. Audio normalization solves exactly this problem — and it's simpler than you think.
What Is Audio Normalization?
Normalization means adjusting the volume of an audio file to a defined target level — without changing the sound quality. There are two fundamentally different approaches:
- Peak normalization: Amplifies the file until the loudest moment reaches a specific dBFS value (e.g. -0.1 dBFS). Simple, but unreliable for perceived loudness.
- LUFS normalization (recommended): Measures average loudness based on the human hearing model (EBU R128 / ITU-R BS.1770). This is the standard used by all major streaming platforms.
Key LUFS Standards by Platform
| Platform / Use | Target (LUFS) | Note |
|---|---|---|
| Spotify | -14 LUFS | Automatic adjustment |
| YouTube | -14 LUFS | Louder = gets reduced |
| TikTok | -14 LUFS | Short clips |
| Apple Podcasts | -16 LUFS | Podcast standard |
| Broadcasting (EBU R128) | -23 LUFS | EU legal standard |
| Audible / Audiobooks | -18 to -20 LUFS | ACX requirements |
Practical tip: If your file is louder than the platform standard, it will be automatically turned down — without quality loss. If it's too quiet, it will sound weak compared to other content. The goal is hitting the right average level.
Step-by-Step: Normalize Audio with KodiniTools
- Open the Audio Normalizer
- Upload your audio file
MP3, WAV, OGG or M4A — your file is processed securely on our servers.
- Set the target level (LUFS)
Podcast: -16 LUFS · Music / YouTube / TikTok: -14 LUFS · Broadcasting: -23 LUFS
- Start normalization
The server analyzes the loudness of your file and adjusts it precisely to the target level.
- Download
The normalized audio file is immediately ready for download — in the same format as the input.
Common Normalization Mistakes
Mistake 1: Using only peak normalization
Peak shows how loud the loudest moment is — not how loud the file is perceived. Two files with identical peak values can sound completely different in loudness. Always use LUFS for consistent results.
Mistake 2: Normalizing multiple times
Each normalization of MP3 files can cost quality because MP3 recompresses on saving. Better approach: keep the source material as WAV, normalize it, then export to the target format.
Mistake 3: Ignoring compression
Normalization changes loudness uniformly. For consistent dynamics — e.g. in podcasts with varying speaking volumes — you additionally need a compressor. Compress first, then normalize.
Preparing Audio Files for Podcasts Professionally
For Apple Podcasts, Spotify Podcasts, and all other platforms, we recommend this workflow:
- Remove noise (noise reduction)
- Smooth dynamics (compressor, e.g. -3 dB threshold)
- Normalize to -16 LUFS
- Export as MP3 at 128–192 kbps or WAV
Normalize audio loudness professionally — free and GDPR compliant.
Open Audio Normalizer →