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on 1/17/19A: Hi, thanks for your question. We can convert. M4a files to any of the following formats through our site:. Aac,. Ac3,. Flac,. M4r,. Mp3,. Mp4,. Ogg,. Wav, and. Wma. If you need any help with converting your files, just drop us an email at support@zamzar.com. Thanks, the Zamzar team.