Developed in Europe, this format was designed for mobile users. GSM is used for audio files that contain a large amount of audio information. Suitable for voice recordings, including recordings of phone calls. You can compress and archive a GSM file to achieve a different file size. The format is mostly used to create and store voice information. There are 4 types of this format that can be opened using different applications.

flac

Free Lossless Audio Codec: a popular free codec

This format stands for an audio file that does not lose sound quality when compressed. The Free Lossless Audio Codec is popular among music lovers who use high-end equipment to listen to music. The advantage of this format is that it does not delete any data from the audio stream. FLAC is supported by most audio players, audio applications, and audio systems. It is a free open-source format. When converting an audio file to the FLAC format, you can save a significant amount of storage space without losing the sound quality.