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AACGain normalizes the volume of digital music files using the Replay Gain algorithm. It works by modifying the global_gain fields in the mp4 samples. Free-form metadata tags are added to the file to save undo information, making the normalization process reversable. AACGain supports mp4/m4a files. Raw AAC files/HE-AAC/SBR are not supported. AACGain uses the same command-line user interface as mp3gain, and is compatible with the mp3gain Visual Basic GUI. It also integrates with iTunes using my iGain GUI.

Free software
OS: Windows
File size: 1.2MB
Portable version
Old versions
Version history
6 votes
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AACGain screenshot
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Latest version

1.9 (August 4, 2010)


Download AACGain 1.9  1.2MB  Portable

Download old versions

Download AACGain old versions

Software License

Free software / FOSS (Free download and also Free and Open Source Software)

Supported operating systems


Complete Version history / Release notes / Changelog

What's new in Version 1.9

* Fixed a bug in mp4v2 which caused iTunes music video files to fail with "not a valid mp4/m4a file" error.
* Gives a more meaningful error message when attempting to process Apple Lossless files.
* Built with updated mp4v2 from Google Code, which should build error-free on modern Windows, Mac and Linux systems.
* Built with updated faad2 code, which should build error-free on modern Windows, Mac and Linux systems.
* Built with latest mp3gain version 1.5.2 source checked into CVS, which includes id3v2 tag support.
* MSVC++ solution and project files have been converted to Visual C++ 2010 Express Edition.

Version 1.8 is now available

* Built with mpeg4ip/mp4v2 version 1.6.1. Aacgain 1.7.1 was built with version 1.5.20. Mp4v2 version 1.6.1 corrects problems that corrupted video files containing Quicktime chapter markers.
* Built with latest mp3gain version 1.4.7 sources checked into CVS. The mp3gain changes made since 1.7.1 support sample rates up to 96000. Previous versions had a maxmimum sample rate of 48000.
* Ignores faad2 "scalefactor out of range" errors. These errors resulted in "invalid file format" errors on apparently good files.

Version 1.7 is now available

It fixes the following issue:

* If the total length of the directory plus file name path exceeded 64 bytes, memory corruption would occur. This has been corrected.

Version 1.6 fixed the following issue:

* Files with a 'cprt' (copyright) tag are now processed correctly. Previous versions of aacgain corrupted the metadata of files with a copyright tag.
* AACGain now works on video or other files where the first audio track has a track number of other than 1. Previous versions required the audio track to have a number of 1. AACGain will still only process the first audio track found on a file. Thanks to Arthur Yarwood at Sony Computer Entertainment Europe for this fix.

Version 1.5 fixed the following issue:

* Running AACGain on Apple lossless or other unsupported file format resulted in a crash with an unhandled exception.

Version 1.4 fixed the following issues:

* Temporary files are created in the same directory as the input file. Formerly they were created in the same directory that the program was run in. This solves a problem only seen on Unix systems where the temporary file could not be renamed back to the original input filename, if the input file was located on a different filesystem from where the program was run. Windows users are unaffected by this problem and can continue to use 1.3.

Version 1.3 fixed the following issues:

* Always uses the /t (use temp file) option, even if it is not specified on the command line. This resolves issues where processed files would not play on the iPod Shuffle.
* Preserves original values of MP4 properties bufferSizeDB, maxBitrate and avgBitrate. Without this change, mpeg4ip/mp4vs was recalulating the actual values of these parameters. This caused bitrate as displayed by iTunes to change slightly, i.e. songs ripped at 320KB would display as 319KB.
* Incorporates recent changes to mp3gain which prevent crashes when working with 48KB files on Linux.
* Source code directory structure was reorganized to be compatible with mp3gain CVS on sourceforge. Thanks to Glen Sawyer, the AACGain source code is now hosted on sourceforge's CVS repository as part of the mp3gain project.

Version 1.2 fixed the following issues:

* Compatibility issue with MP3GainGUI version 1.2.5 or 1.3.4.
* All temporary files created are erased.

Version 1.1 fixed the following issues:

* Multi-channel and mono files now work.
* Fixes compatibility issues with MP3GainGUI: the /o option always outputs Album gain.
* The /f option is ignored for AAC files. If a file starts with a 'ftyp' atom, it is assumed to be AAC, even if /f was specified. This prevents the /f option from corrupting valid AAC files.
* Uses portable versions of all library functions, and has been successfully compiled under Linux. Thanks to Prakash Punoor for his help with this.
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Sections/Browse similar tools

Alternative to AACGain

Free Video Volume Booster

Volume Limiter

Volume Normalizer Master

Guides and How to's

Acronyms / Also Known As

iGain, iGain GUI

Download AACGain Portable download from the Download links under Download and Download other versions!

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6 reviews, Showing 1 to 5 reviews

Using this as recommended with the beta version of Mp3Gain 1.34 it works flawlessly. I extract my audio using Pazera 2.7 Audio Extractor- another superb freeware and run it through aacGain. AacGain will accept any mp4 extracted by Yamb(portable only as its installer wrecks your registry!) as raw or with extension mp4a. Heaac must be checked with other tools like the Sound normaliser 7 series. Great program!

Review by xtro on Apr 7, 2018 Version: 1.9 OS: WinXP Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 10/10

necrosoft or whatever your name is stop writing lies about having to install iTunes for this program to work when it is clearly not true. aacGain is an excellent program, if used correctly, just a shame its development was stopped.

Review by Tina on Oct 29, 2017 Version: 1.9 OS: WinXP Ease of use: 10/10 Functionality: 9/10 Value for money: 10/10 Overall: 10/10

What nonsense to write you must iTunes installed. Don't write such nonsense to mislead people! Everything works great!

Review by Tony Manero on Oct 28, 2017 Version: 1.9 OS: Vista Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 10/10

Why the low reviews? This is very useful software indeed. All I did was rename it as mp3gain.exe as instructed and place it in the folder of last version of mp3gain to replace the exe there and it works perfectly to analyse aac files like those with .mp4a extensions or those done with Handbrake using faac etc. It wont analyse He-aac as it throws errors out so use Sound Normalizer 7.99.7 for those audio types.

Also this aac gain tool is great to analyse audio extracted from a Handbrake encode which may have clipping after using its gain feature. I always extract my Handbrake h264 encoded video file audio using Yamb portable(the installer wrecks registry settings!) then run it through m3gain and remove the clipping. Remux it back into your video with Yamb or better still use mkv toolnix for perfect audio/video synch and place a SRT inside this wonderful mkv container.

Review by 7of9 on Oct 28, 2017 Version: 1.9 OS: WinXP Ease of use: 10/10 Functionality: 9/10 Value for money: 10/10 Overall: 10/10

Another GUI that works with the AACGain.exe is........MP3Gain.
(No iTunes install need)

"The MP3Gain 1.3.4 beta version of the GUI is designed to work with AACGain. Download AACGain, rename "AACGain.exe" to "mp3gain.exe", and put it in the MP3Gain folder."

Review by Island Buoy on Nov 9, 2008 Version: v1.8 OS: WinXP Ease of use: 7/10 Functionality: 7/10 Value for money: 9/10 Overall: 7/10

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