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Sony OpenMG music format
File type: Audio and sound file
Files with oma file extension are commonly found as audio files in special Sony OpenMG audio format that was introduced in 2002.
File type category:
Audio and sound file
Date updated: July 13, 2025
Record marked as obsolete and not updated for a long time.
The oma file extension is used for Sony OpenMG audio format.
These oma files are in ATRAC3 (Adaptive TRansform Acoustic Coding3) An audio compression technology from Sony that provides multiple compression ratios depending on desired sound quality.
At 132 Kbps, the music can be compressed to approximately 10% of the space used by a CD. Introduced on the MiniDisc in 1993, the original ATRAC format provided near CD quality sound, but ATRAC3, introduced in 1999, rivals the CD. ATRAC compression is 5:1; ATRAC3 is 10:1.
ATRAC3plus In 2002, Sony introduced ATRAC3plus, which provides a 20:1 compression ratio, bringing the data down to 5% of the original CD. It can achieve very high quality sound at 48 and 64 Kbps or be practically indistinguishable from the original at 256 Kbps. The CD data rate is 1,411 Kbps.
Use Sony SonicStage to open *.oma music files.
It is possible to convert Sony OMA audio to other audio formats, like MP3 which in turn allows for conversion to any other audio format.
Apps designed for playing oma files:
Microsoft Windows
Apple macOS / Mac OS X
Linux/Unix
Google Android
Software apps that import oma files:
Microsoft Windows
Software apps that export oma files:
Microsoft Windows
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