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AT3 File - What is an .at3 file and how do I open it?
Learn about .AT3 files and view a list of programs that open them.
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Overview
What is an AT3 file? An AT3 file is an audio file saved in Sony’s Adaptive Transform Acoustic Coding 3 (ATRAC3) compression format. It stores music or game audio used on devices such as the PlayStation Portable (PSP), Sony CD and MP3 players, and Sony Ericsson mobile phones. AT3 files were also embedded in game directories, particularly on the PSP, to store background music and sound effects in Sony-developed games.
More Information Sony developed the ATRAC3 format to reduce audio file size while maintaining acceptable sound quality, making it suitable for portable devices. Additionally, Sony commonly used ATRAC3 in the early 2000s for storing music on MiniDiscs, MP3 players, and other portable media devices. Users often managed and transferred AT3 files between a computer and portable Sony devices with SonicStage software (developed by Sony). Today, AT3 files are less common, and support for the ATRAC3 format has largely been discontinued in favor of more widely supported audio formats, such as .MP3 and .AAC . NOTE: Users may also encounter similar formats, such as .AA3 and .OMG files, which are related to ATRAC3 and sometimes include Digital Rights Management ( DRM ) to control playback.
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DeveloperSony
Popularity3.8 | 12 Votes
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.AT3 File Extension
ATRAC3 Audio File
| Developer | Sony |
| Popularity |
3.8 | 12 Votes |
NEW: Open your .AT3 file online with File Helper . View Online
What is an AT3 file?
An AT3 file is an audio file saved in Sony’s Adaptive Transform Acoustic Coding 3 (ATRAC3) compression format. It stores music or game audio used on devices such as the PlayStation Portable (PSP), Sony CD and MP3 players, and Sony Ericsson mobile phones. AT3 files were also embedded in game directories, particularly on the PSP, to store background music and sound effects in Sony-developed games.
More Information
Sony developed the ATRAC3 format to reduce audio file size while maintaining acceptable sound quality, making it suitable for portable devices. Additionally, Sony commonly used ATRAC3 in the early 2000s for storing music on MiniDiscs, MP3 players, and other portable media devices.
Users often managed and transferred AT3 files between a computer and portable Sony devices with SonicStage software (developed by Sony). Today, AT3 files are less common, and support for the ATRAC3 format has largely been discontinued in favor of more widely supported audio formats, such as .MP3 and .AAC .
NOTE: Users may also encounter similar formats, such as .AA3 and .OMG files, which are related to ATRAC3 and sometimes include Digital Rights Management ( DRM ) to control playback.
How to open an AT3 file
You can open AT3 files with various programs, including VideoLAN VLC media player and MAGIX Sound Forge Pro . For example, to open an AT3 file with VLC media player, select Media/File → Open File .
Sony SonicStage can also manage and transfer AT3 files. However, Sony discontinued the software.
How to convert an AT3 file
Several media players and video editors, including VideoLAN VLC media player and MAGIX Sound Forge Pro, can convert AT3 files to other formats.
For example, VLC media player can convert AT3 files to the following formats:
Programs that open AT3 files
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Program Name
Platform
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Windows
VideoLAN VLC media player
Free
MAGIX Sound Forge Pro 17
Free Trial
MAGIX ACID Pro 11
Free Trial
MAGIX Vegas with ATRAC plugin
Free Trial
Sony SonicStage
—
Discontinued
Free
Mac
VideoLAN VLC media player
Free
Linux
VideoLAN VLC media player
Free
Web
FileHelper.com
Free
Category: Audio Files
Updated: June 18, 2025