MP3 is a lossy audio file format, which was first released by the Moving Picture Experts Group in 1993 with the extension .bit until it was changed to .mp3 in 1995. It allows for the storage of large quantities of audio data in a limited amount of space.
Speex Audio Compression Format
Is an open source patent-free audio format designed primarily for speech.
How to use this MP3 to SPX converter
Drop your MP3 file into the box, or click to select a file from your computer.
Review file and click remove if you would like to choose another.
Click convert. Your file will upload and the conversion process will begin. Larger files will take longer to convert.
Your new SPX file will appear below. Click download to save to your computer.