AT3 File

What are AT3 files and how to open them

Are you having problems opening an AT3 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your AT3 files.

What is an AT3 file?

An .AT3 file is a Sony ATRAC3 Audio file.

Sony developed ATRAC3 as a proprietary lossy audio compression format to store sound - such as music, game audio, or background media - on devices like the PlayStation Portable (PSP), MiniDisc hardware, Sony MP3/CD players, and certain Sony mobile phones. An AT3 file contains audio encoded using the ATRAC3 codec, designed to make files much smaller than uncompressed audio while preserving reasonable listening quality.

Audio creators usually output AT3 files via Sony's encoding tools, sound editing software or as part of game asset packages when using the ATRAC3 codec. Once encoded, these files are played back by devices or software that include the ATRAC3 decoder. ATRAC3 was often used when storage or bandwidth were limited - so music and effects for portable players or PSP games were converted into AT3. Related formats like AA3, OMA, or OMG also use ATRAC3 or include it (sometimes with digital rights management added).

ATRAC3 supports bitrates of 66 kilobits per second, 105 kbps, and 132 kbps for standard ATRAC3 files, all using a 44.1 kHz sampling frequency. The latest version of ATRAC3 for this base layer does not support lower or higher sample rates in standard mode. In streaming or RTP payload usage, a typical ATRAC3 frame represents 1024 audio samples, corresponding to approximately 23.22 milliseconds per frame.

How to open AT3 files

We have identified one AT3 opener that is compatible with this specific type of AT3 file.

Programs that open Sony ATRAC3 Audio files

Last updated: August 5, 2026

Various apps that use files with this extension

These apps are known to open certain types of AT3 files. Remember, different programs may use AT3 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about AT3 file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.