.G721 File Extension

G.721 ADPCM Audio

Developer International Telegraph Union
3.0  |  1 Vote

What is a G721 file?

A G721 file is an audio file saved using the G.721 codec, which was created by the International Telegraph Union (ITU). It contains 8kHz ADPCM audio transmitted at 32 kbit/s. Typically, G721 files contain spoken audio.

More Information

The ITU is a division of the United Nations responsible for coordinating the world's response to communication technology issues. Among other things, the ITU creates standards for saving and transmitting audio. The G.721 codec, which was released in 1984, is one such standard.

G.721 has since been superseded by the G.726 standard. As a result, you are unlikely to encounter G721 files.

How to open a G721 file

You can use FFmpeg (multiplatform) or libsndfile (multiplatform) to play the audio a G721 file contains.

How to convert a G721 file

You can use FFmpeg (multiplatform) or libsndfile (multiplatform) to convert the audio a G721 file contains to other formats. For example, FFmpeg can convert the audio a G721 file contains to many common audio formats, including .MP3, .WAV, .FLAC, and .AAC.

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Programs that open G721 files


Verified by FileInfo.com

The FileInfo.com team has independently researched the G.721 ADPCM Audio file format and Mac, Windows, and Linux apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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