Latest Stable Release v1.2.5 (2026)

MP3Gain: The Lossless Volume Normalizer
Fixed for Windows 11

Stop adjusting your volume knob for every song. MP3Gain analyzes and normalizes your MP3 files directly—without decoding or re-encoding. This ensures zero quality loss. Our repacked version includes the essential MSCOMCTL.OCX libraries to prevent “Runtime Error 75” on modern systems.

  • ✓ Open Source (GPL)
  • ✓ No Spyware
  • ✓ Reversible Changes
Why do you need MP3Gain?

Stop Reaching for the Volume Knob

We have all been there: one song plays softly, forcing you to turn up the volume. The next track blasts through your speakers, nearly destroying your eardrums. This happens because MP3s from different sources are mastered at different levels. MP3Gain solves this permanently.

Windows 11 Ready (Fixed)

The original MP3Gain often fails on Windows 10/11 with “Component MSCOMCTL.OCX not correctly registered” errors. Our repackaged installer automatically includes and registers the necessary Visual Basic runtime libraries, ensuring a smooth, error-free launch on modern 64-bit systems.

Zero Quality Loss

Unlike other audio editors that decode, normalize, and then re-encode your files (causing digital degradation), MP3Gain adjusts the MP3 file’s Global Gain fields directly. The audio data remains completely untouched. You can even undo the changes perfectly.

Track & Album Analysis

Track Gain makes every song the same volume (great for mixed playlists). Album Gain preserves the intentional volume differences between tracks on an album (e.g., a quiet intro vs. a loud symphony) while adjusting the overall album loudness.

Beyond Peak Normalization

Standard normalization just looks at the highest peak, often making songs sound too quiet if they have one loud moment. MP3Gain uses Statistical Analysis to determine how loud the file actually sounds to the human ear (psychoacoustics), ensuring consistent perceived loudness.

How to Normalize MP3 Volume in 3 Steps

MP3Gain is designed for simplicity. You do not need to be a sound engineer to get consistent audio levels.

  1. 1

    Add Your Files

    Click “Add Files” or drag-and-drop your folder directly into the window. You can process single tracks or entire albums at once.

  2. 2

    Analyze Volume

    Set your “Target Normal Volume” (Default is 89.0 dB). Click “Track Analysis”. The software will calculate how much gain is needed for each song.

  3. 3

    Apply Gain

    Click “Track Gain”. MP3Gain will update the files instantly.
    *Red numbers mean clipping (distortion) might occur. Lower the target volume if needed.

Pro Tip: Unlike other tools, this process is completely reversible. If you don’t like the result, you can simply run “Undo Gain” to restore the original file state.

Ready to Normalize Your Music?

Download the latest stable version of MP3Gain (v1.2.5).
Patched for modern systems, safe, and completely free.

Windows 11/10
macOS (Legacy)
Source Code
Go to Download Page

Virus Tested GPL License

Is MP3Gain Enough for You?

MP3Gain is the best tool for volume normalization, but it is not a full audio editor. Check the comparison below to see if you need additional tools.

Feature MP3Gain (Free) Pro Audio Editor Partner
Volume Normalization ✓ Lossless (Best) ✓ Standard
Trim / Cut / Merge ✗ Not Supported ✓ Full Support
Noise Reduction (AI) ✗ Not Supported ✓ One-Click Clean
Supported Formats MP3 Only MP3, WAV, FLAC, M4A
Included in download Try Free Trial →
Recommended for Win 11
The Technology

How “Lossless” Normalization Actually Works

Most audio tools use Destructive Normalization. They decode the MP3 into a WAV file, mathematically multiply the amplitude (volume) of the wave, and then re-encode it back to MP3. This process introduces quantization errors and reduces high-frequency fidelity with every save.

The MP3Gain Method

MP3Gain works directly on the MP3 format structure. Inside every MP3 file, the audio data is stored in a series of “Frames”. Each frame has a specific field called “Global Gain” (an 8-bit integer).

  • MP3Gain calculates the difference between the current volume and your target (e.g., 89dB).
  • It simply changes the integer value in the Global Gain field.
  • Result: The player decodes the music louder or softer, but the actual audio data stream remains bit-for-bit identical to the original.
MP3 FILE STRUCTURE
MP3 Header
Global Gain Field
(MP3Gain modifies ONLY this)
←
Compressed Audio Data
(Untouched / Safe)
APEv2 Tag (Undo Info)

Visual representation of non-destructive editing

Safety Net: The APEv2 Tag

MP3Gain writes “Undo” information to an APEv2 tag at the end of the file. This means if you accidentally set the volume too low or too high, you can always use the “Undo Gain Changes” feature to restore the file to its exact original state, bit-for-bit.

Troubleshooting

Common Errors & Fixes

Encountering bugs on Windows 10 or 11? Here is how to resolve the most common runtime issues.

Component MSCOMCTL.OCX Missing

The Symptom

When launching MP3Gain, you see a popup: “Component ‘MSCOMCTL.OCX’ or one of its dependencies not correctly registered.” or “Runtime Error 339”.

The Fix

Option 1: The Hard Way (Manual)
> Download mscomctl.ocx
> Move to C:\Windows\SysWOW64
> CMD: regsvr32 mscomctl.ocx
Runtime Error 75

The Symptom

The program crashes immediately upon opening or when you try to save settings, showing “Runtime Error 75: Path/File access error”.

The Fix

This happens because modern Windows protects the “Program Files” folder from being written to by old applications.

  • 1
    Right-click the MP3Gain desktop shortcut.
  • 2
    Select Properties > Compatibility tab.
  • 3
    Check the box: “Run this program as an administrator”.

Still having issues? Visit our Full Installation Guide for step-by-step screenshots.

100% Clean & Safe

We take security seriously. Our repacked installer is scanned daily and contains zero adware, zero spyware, and zero bundled toolbars. It is simply the original code with updated system libraries.

Credits & License

MP3Gain was originally developed by Glen Sawyer. This website is an unofficial community hub dedicated to keeping the software compatible with Windows 11.

Licensed under GNU LGPL. Source code available on our download page.

Why This Site Exists?

We love MP3Gain, but the official installer hasn’t been updated since 2005, causing errors on modern PCs. We built this repacked version to ensure this legendary tool survives the Windows 11 era.

Support Center

Frequently Asked Questions

Common questions about installation, errors, and audio normalization.

Does MP3Gain work on Windows 11? +

Yes, but you need the right version. The original 2005 installer often fails with “Runtime Error 75” or “Component MSCOMCTL.OCX missing”.

The version available on our website is a repacked edition specifically patched for Windows 10 and 11 (64-bit). It automatically installs the required Visual Basic runtime files so the software launches immediately without errors.

Does it reduce audio quality? (Lossless vs Re-encoding) +

No quality is lost. This is the main advantage of MP3Gain over other audio editors.

Most editors decode the MP3 to WAV, change the volume, and re-encode it back to MP3, which causes “generation loss” (digital degradation). MP3Gain works differently: it adjusts the Global Gain metadata fields inside the MP3 frames. The actual audio data is never touched, meaning the process is 100% lossless and reversible.

Track Gain vs. Album Gain: Which should I use? +
  • Track Gain: Calculates volume for each song independently. Use this for mixed playlists (e.g., a folder with Rock, Jazz, and Pop songs) so they all sound equally loud.
  • Album Gain: Calculates the volume of the entire album as a whole. It preserves the intentional quietness of some tracks relative to others. Use this if you are normalizing a complete album (e.g., Pink Floyd’s Dark Side of the Moon).
How do I fix “Component MSCOMCTL.OCX not correctly registered”? +

This is the most common error on Windows 10/11. You have two options:

  1. Easier: Download our Fixed Installer which handles this automatically.
  2. Manual: Download the file mscomctl.ocx, place it in C:\Windows\SysWOW64, open Command Prompt as Administrator, and type regsvr32 mscomctl.ocx.
Does it support FLAC, M4A, or MP4? +

MP3Gain strictly supports MP3 files.
If you need to normalize FLAC, AAC (M4A), or video files, MP3Gain will not work. For these formats, we recommend using a modern audio editor like AVS Audio Editor or Audacity.

Stop Listening to
Uneven Volume Levels

Get the industry standard for lossless MP3 normalization.
Completely free, open-source, and fixed for Windows 11.

Download MP3Gain v1.2.5

Works on Windows 11, 10, 8, 7 & macOS