The M4A file format forms part of the MP4 specification, specifically the audio stream of the Mp4 format. .m4a files are essentially audio only bit streams encoded using the audio codecs from the MPEG-4 Part 14 specification. Audio encoding can be accomplished using algorithms from the lossy family or lossless family of codecs. One of the design goals of the M4A audio format was to achieve a high level compression ratio without sacrificing audio quality. In this regard, it was intended that the format would succeed the MP3 file format. Although it has done this from a technical standpoint, the MP3 format continues to be widely used.
Opus is a versatile audio codec optimized for both speech and music. It offers excellent quality at low bitrates.
FreeFileConvert uses tuned encoding for M4A to OPUS conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload M4A files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized OPUS results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent OPUS audio with dependable progress tracking.
Typically an m4a audio stream is encoded using the lossy Advanced Audio Coding format or AAC compression format which has a minimal tradeoff of audio quality in favor for storage size. In situations where maximum quality is required, the Apple Lossless Audio Codec or ALAC can be used.
Opus uses a hybrid approach combining SILK and CELT codecs. It supports bitrates from 6 kbps to 510 kbps.
Upload your audio file in the M4A format from your device, Dropbox, or Google Drive.
Select OPUS as the output format and click Convert. Adjust optional settings if needed.
Download the converted audio file. Each file stays available for up to 5 downloads.