LUFS Metering
Integrated loudness per ITU-R BS.1770-4. With true peak and block statistics. Precise as a studio meter.
v1.2 · macOS
Loudness, finally in measure.
Audio Normalizer measures and normalizes audio and video files to ITU-R BS.1770-4 — matching the Apple Podcasts standard, or any target value you choose. With video, the picture track stays untouched. Editorial precision. Sandbox-safe. In 39 languages.
Everything audio needs.
A calm, focused app for a technically demanding task. Not a thousand options — only the ones that matter.
Auto Normalization
To the Apple Podcasts standard (−16 LUFS) or any target. With true-peak limiting — no overshoots, ever.
Batch Processing
Whole folders in one click. Queue persists across app restarts — no lost progress, no broken workflow.
39 Languages
Fully localized interface. Live switching without restart. Fallback system for incomplete translations.
Formats
WAV and AIFF stay lossless PCM, MP3 and FLAC are converted to M4A. With MP4, MOV and M4V only the audio is touched — the video track is copied byte for byte, without re-encoding.
System Notifications
Native macOS notifications when a batch completes. Processing runs quietly in the background.
Everywhere in the system.
Audio Normalizer doesn't only live as an app. It works in AppleScript workflows and right in the Finder context menu.
AppleScript
Integration with Script Editor, Automator, and third-party apps. Audio becomes part of your workflow.
tell application "Audio Normalizer" normalize file "audio.mp3" end tell
Finder Service
Right-click any audio file → Normalize. Directly in the macOS context menu and Quick Actions.
Finder → Right-click → Services → "Normalize Audio"
Siri Shortcuts
Voice control and automation. Say "Hey Siri, normalize this audio" — and it just happens.
Shortcuts.app → Audio Normalizer → Run
Substance, not showroom.
Standard
ITU-R BS.1770-4
Target loudness
−16 LUFS
Input formats
WAV · AIFF · MP3 · M4A · FLAC · MP4 · MOV · M4V
Output formats
WAV · M4A · video in its original format
Languages
39 localized
System
macOS 14+
Calm, clear, legible.
Three screens, one promise: no distraction. The Henry Bauer designsystem makes room for the task.
Main window
From references.
Reference audio defines the target automatically. LUFS averaged across all files.
Manual mode
Typical target values.
Four presets for Spotify, Apple Podcasts, ACX and EBU R128 — or your own LUFS target.
Settings
Language, folders, watcher.
Language picker at the bottom, watch-folder on top — three folders for input, reference, output.
Questions & Answers.
What does −16 LUFS mean for podcasts?
−16 LUFS (Loudness Units Full Scale) is the international standard for stereo audio on podcasts (recommended by Apple Podcasts, Amazon Music, and others). Normalizing your episodes to this target ensures they maintain a consistent volume level compared to other shows in the listener's player. This saves your listeners from constantly having to adjust their volume manually. Audio Normalizer measures integrated loudness according to ITU-R BS.1770-4 and adjusts gain transparently.
How do you normalize audio on macOS in a batch?
Most traditional audio editors require you to load and process each file manually one-by-one. With Audio Normalizer, you can simply drag-and-drop entire folders into the app, set your target loudness once, and start the batch. The native processing engine normalizes all WAV, MP3, or FLAC files in the background, utilizing Apple Silicon architecture for maximum speed, and notifies you when the queue is completed.
Available for Mac
One-time purchase in the Mac App Store · No subscriptions · No ads · Lifetime updates