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Officially known as the MPEG-4 Audio format, the M4A was developed by many companies, like Bell Labs, Dolby Laboratories, Microsoft, the Fraunhofer Society, and others. It was released in 1997, and its filename extension is .m4a.
Designed to be the successor to MP3, M4A is an audio format whose data is encoded with the Advanced Audio Coding (AAC). It's also part of the MPEG-2 and MPEG-4 standards.
Since this format uses the AAC codec, it's also known by that name.
It is mainly used by Apple. So it is the default music format in iTunes, Apple Music, and it is compatible with iOS devices.
M4A is a standard format for digital audio, valid for the digital distribution of music. But, as with everything, it has its benefits and drawbacks. You can see them in detail below.
No, Windows 10 does not support the M4A format. In fact, no Windows device does it. Unfortunately, that means you can't open M4A files with Windows Media Player, at least no natively.
Even so, it is possible to open M4A files with a Windows computer installing the proper codec in your device. For example, by downloading and installing the K-Lite Codec Pack on your computer, Windows Media Player should be able to open M4A files.
Another way to open M4A files in Windows would be to download a media player that supports the M4A format, such as the VLC Media Player.
No, M4A files are not usually lossless. In most cases, M4A files use the AAC codec, which is a lossy compression technology. It discards unnoticeable audio data from the original file to reduce its size. And such a thing affects the audio quality and fidelity.
But .m4a is also the filename extension of ALAC (Apple Lossless Audio Codec) files, which is a lossless format. So in those cases, M4A is lossless, of course.
But the common thing is that the M4A format refers to AAC, and for this reason, M4A is lossy most of the time.
Yes, M4A is better than MP3 in almost every way.
M4A uses more advanced compression technology than MP3. For that reason, the former reaches smaller file sizes than the latter. M4A also has a higher quality than MP3. So in terms of technology and audio quality, M4A is better.
MP3 is better than M4A in terms of accessibility since it is a universal audio format, and M4A isn't.
No, you can't use Windows Media Player to convert M4A files to other formats. Windows Media Player cannot convert any file to different formats because it's just player software. Its only purpose is to play multimedia (video/audio) content and nothing more.
M4A is not an open format. But, despite that, you can legally use it for free to distribute and stream content online.
However, if you intend to develop an M4A codec, you must pay for a patent license.
M4A format guide
M4A is an MP4-family audio container, most commonly holding AAC or Apple Lossless audio.
Published audio routes run through the deployed FFmpeg toolchain. The converter probes the source stream before conversion, and files without a decodable audio stream cannot produce an audio result.
Convert M4A to MP3 for older playback, WAV for editing, or FLAC for lossless storage when the source is lossless.
The public upload limit is 1 GB. Convertr does not reduce dimensions, duration, resolution, or output quality merely to manage worker load.
WAV, AIFF, and FLAC are appropriate when decoded sample fidelity matters. MP3, AAC, Opus, WMA, and Vorbis are lossy; choose bitrate for the destination and do not expect a higher number to restore source detail.
The .m4a extension does not identify the codec; transcoding AAC cannot become truly lossless.
These links come from the active conversion catalog, not from a generic list of possible formats.
Choose one of these implemented routes; a listed extension is not a promise that every codec variant will decode.
Check that the file opens in its original application, is not encrypted or DRM-protected, and really matches its extension. A damaged header, unsupported internal codec, missing linked asset, or mislabeled file can fail even when M4A is generally supported. Try a different published target only when it fits your goal; changing the extension by hand does not convert the file.