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MP3Gain
Every track, the same loudness — on your Mac, iPhone, and iPad.
One app, every Apple device
Normalize your library on the Mac — then take the same presets with you on iPhone and iPad
macOS — rebuilt for 7.0
Drag files or a whole folder onto the window, send results to an output folder that's remembered between launches, or replace the originals in place. Batches run in parallel across your Mac's cores.
iPhone — 2.0
Pick files from the Files app or import from your Music library, then share the results to any app. Play the original and the processed version back to back before you commit.
iPad — 2.0
The same loudness engine and one-tap presets on a bigger canvas — handy for normalizing an entire album or a folder of podcast episodes in one sitting.
Private on every platform
Everything is processed on your own devices — no accounts, no uploads, no analytics. Your audio never leaves the Mac, iPhone, or iPad you're holding.
How It Works
Normalize your audio in three simple steps — the Mac adds drag-and-drop and folder output, iOS keeps it one-tap
Import Files
Add files with ⌘O, drag them onto the Mac window (drop a folder to add every track inside), pick them in the Files app, or import from your Music library.
Choose Method
Select EBU R128, RMS, or Peak Limiting — then pick a preset like Music, Podcast, or Streaming Video, or dial in your own values.
Process & Keep
Start the batch and follow per-file progress. On the Mac, reveal the results in Finder or replace the originals; on iOS, share them straight to another app.
Features
Everything you need for consistent audio volume
EBU R128 Loudness Normalization
Industry-standard loudness measurement that matches how human ears perceive volume. Control integrated loudness, loudness range, and true peak.
RMS Volume Adjustment
Traditional average-signal-level adjustment for quick, straightforward volume changes to a specific dB target.
Peak Limiting
Prevent clipping and harsh distortion. Set a maximum level ceiling to protect your audio.
Batch Processing
Normalize a whole album in one pass. The Mac spreads the work across your cores (up to four files at a time); iPhone and iPad work through the list with per-file progress. One bad file never stops the batch, and you can stop or cancel at any point.
One-Tap Presets
Default (−23 LUFS), Music (−20 dB RMS), Podcast (−16 LUFS), Voice (−18 LUFS), and Streaming Video (−14 LUFS) are ready to use — and you can save your own settings as custom presets.
Import Your Way
Use ⌘O or drag files onto the Mac window, import from your Music library, pick files in the Files app, or open an audio file in MP3Gain from any other app.
Listen Before You Commit
Play the original and the normalized version in the app and hear the difference before you export. No guessing from numbers alone.
Artwork & Metadata Kept
Embedded cover art and tags are preserved. Lossy files keep their original bitrate, and lossless files are processed without additional lossy compression.
Output Your Way
On the Mac, choose an output folder that's remembered between launches, or replace the original files in place. When a batch finishes, reveal the results in Finder with one click.
Multi-Format Support
Works with MP3, FLAC, M4A, WAV, AIFF, and OGG — every format is available on the free plan as well as Pro.
Screenshots
MP3Gain 7 for macOS — drag in a batch, pick a preset, and keep the results wherever you like
On iPhone & iPad
MP3Gain 2 for iOS — the same presets and loudness engine, in your pocket
iPhone
iPad
Free vs MP3Gain Pro
Process up to 3 files a day for free — upgrade when you need unlimited
| Feature | Free | Pro |
|---|---|---|
| EBU R128 | 3 files/day | ✓ Unlimited |
| RMS Volume | 3 files/day | ✓ Unlimited |
| Peak Limiting | 3 files/day | ✓ Unlimited |
| Batch Processing | 3 files/day | ✓ Unlimited |
| Presets | ✓ Built-in | ✓ Built-in |
| Custom Presets | ✓ | ✓ |
| Format Support | ✓ All formats | ✓ All formats |
| Support | Community | ✓ Priority |
MP3Gain Pro: $9.99/year or $19.99 once (lifetime) — the same on macOS, iPhone, and iPad. Already own MP3Gain for Mac? Your previous purchase unlocks Pro automatically.
Specifications
-
Version
7.0.0 (macOS) · 2.0.0 (iOS) -
Devices
Mac, iPhone, and iPad -
OS
macOS 13.0 or later · iOS 16.6 or later -
Architecture
Apple Silicon & Intel Macs -
Modes
Peak, RMS, EBU R128 -
Format Support
MP3, FLAC, M4A, WAV, AIFF, OGG
FAQ
Which devices can I run MP3Gain on?
MP3Gain 7 runs on any Mac with macOS 13 or later — Apple Silicon or Intel — and MP3Gain 2 runs on iPhone and iPad with iOS 16.6 or later. The Mac version adds drag-and-drop imports, folder output, and parallel batch processing, while the iOS version focuses on quick one-tap jobs with share-sheet export.
What makes MP3Gain different from other volume normalizers?
MP3Gain uses EBU R128 — the broadcast industry standard for loudness measurement — which matches how human ears actually perceive volume. Unlike simple peak normalization, it analyzes perceived loudness so every track sounds equally loud, not just equally tall on a waveform. Plus, everything runs locally on your own device with no uploads or cloud processing.
What audio formats does MP3Gain support?
MP3Gain supports MP3, FLAC, M4A, WAV, AIFF, and OGG. Every supported format is available on the free plan as well as with MP3Gain Pro.
Will MP3Gain modify my original files?
On the Mac, processed files are written to the output folder you choose, so your originals stay untouched — unless you turn on Replace original file, which overwrites each source file in place once it succeeds. On iPhone and iPad your originals are never modified; the normalized files are exported through the share sheet. Either way, cover art and metadata are preserved: lossy files keep their original bitrate, and lossless files are never given extra lossy compression.
How much can I do with the free version?
The free version processes up to 3 files per day with all normalization methods — EBU R128, RMS, and Peak Limiting — plus every built-in preset, custom presets, and all supported formats. MP3Gain Pro removes the daily limit for $9.99/year or $19.99 once (lifetime).
Does MP3Gain run natively on Apple Silicon?
Yes. The Mac app is Universal, with native support for both Apple Silicon (M1, M2, M3, M4) and Intel-based Macs, and it uses every core available when processing a batch. The iOS app is a Universal iPhone and iPad app.
Is my audio uploaded to the cloud or shared with anyone?
Never. MP3Gain processes everything locally on your Mac, iPhone, or iPad. Your audio files never leave your device. There are no accounts, no uploads, no cloud servers, and no analytics tracking. What happens on your device stays on your device.
Every track, the same loudness. Start now.
Professional loudness normalization on macOS, iPhone, and iPad — free for up to 3 files a day.