Convert any audio file to M4A format online for free. Fast, secure, and easy-to-use audio to M4A converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your WebM Audio file, or click to browse for it.
Choose M4A as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
Download your converted file instantly. The download link expires in 1 hour for security.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
Works directly in your web browser. No software download or installation required.
How the two formats differ on the things that change your result.
| Specification | WebM Audio (source) | M4A (result) |
|---|---|---|
| Container | WebM (audio-only) | MPEG-4 Part 14 |
| Developed by | Apple / MPEG | |
| Introduced | 2010 | 2003 |
| Audio codecs | Opus, Vorbis | AAC-LC, HE-AAC, ALAC |
| Compression | Lossy | Depends on codec |
| Typical bitrate | 64–256 kbps | 96–256 kbps |
| Max sample rate | 48 kHz | 96 kHz |
| Max channels | 8 | 8 |
| Gapless playback | Partial | Yes |
| Metadata / tags | Matroska tags | MPEG-4 iTunes-style atoms |
| Approx. file size | 0.48–1.92 MB per minute | 0.72–1.92 MB per minute |
| Licensing | Royalty-free | Patent-licensed |
| Plays natively on | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs |
| Best for | web delivery, HTML5 video, open-source projects | the Apple ecosystem, music libraries, audiobooks |
Note that MPEG-4 Part 14 does not imply one specific codec. It can wrap AAC-LC, HE-AAC, ALAC, so the compression behaviour of the result depends on the codec chosen rather than on the extension alone.
This conversion buys reach. Unlike WebM Audio, M4A is natively supported on Windows, macOS, iOS, and smart TVs, which is usually the reason people convert in this direction.
This conversion moves the file toward a different purpose: WebM Audio suits web delivery, HTML5 video, open-source projects, whereas M4A is chosen for the Apple ecosystem, music libraries, audiobooks.
Tags do not transfer verbatim. WebM Audio stores them as Matroska tags while M4A uses MPEG-4 iTunes-style atoms, so titles and artwork are remapped and unusual custom fields may not survive.
Converting WebM Audio to M4A means moving audio out of the WebM (audio-only) container, introduced in 2010, and into MPEG-4 Part 14, which arrived in 2003. The two were designed with different priorities, and that is what determines whether this conversion costs you quality, storage, or compatibility.
Developed by Google in 2010, WebM Audio carries lossy-compressed audio (Opus or Vorbis). That sets the upper bound on what any conversion can preserve.
M4A was introduced by Apple / MPEG in 2003. It holds audio in whichever codec it was encoded with (AAC-LC, HE-AAC, or ALAC) and plays natively on web browsers, Windows, macOS, iOS, Android, and smart TVs.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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