Convert M4A to SPX
Fast, free M4A to SPX conversion — works in any browser
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m4a
M4A — MPEG-4 Audio File
| File extension | .m4a |
|---|---|
| File category | audio |
| Programs | Apple iTunes VLC media player Windows Media Player foobar2000 Winamp |
| Tech description | https://en.wikipedia.org/wiki/M4A |
| MIME type | audio/mp4 audio/x-m4a |
| Developer | Apple Inc. |
M4A is an audio-only file container based on the MPEG-4 standard, introduced by Apple in 2004. The .m4a extension distinguishes audio-only files from .mp4 files that contain video. M4A files are most commonly encoded with the AAC codec, offering better audio quality than MP3 at the same file size. Lossless encoding using Apple Lossless (ALAC) is also possible within the M4A container. M4A is the default format for music purchased from the iTunes Store and Apple Music. It is natively supported on all Apple devices, and plays on Android, Windows, macOS, VLC, foobar2000, and Windows Media Player.
spx
An audio file with recorded voice messages
| File extension | .spx |
|---|---|
| File category | audio |
| Programs | VLC media player Audacity foobar2000 MPlayer |
| Tech description | https://en.wikipedia.org/wiki/Speex |
| MIME type | audio/ogg; codecs=speex audio/x-speex |
| Developer | Jean-Marc Valin (Xiph.Org) |
This format extension is one of the Speex Audio formats. It is an open-source codec developed by Xiph.Org. Used for creating voice messages and transmitting voice over packet-based networks with a low level of security. It is an audio file with recorded voice messages that are packaged in an OGG file. Only certain media players can open it.
FAQ
How to convert SPX to M4A?
Upload your SPX file, select M4A as the output format, and click Convert. The converted file will be ready to download in seconds — no account or installation required.
How long does it take to convert SPX to M4A?
Most SPX files convert in seconds. Larger files may take up to a few minutes depending on size and internet speed. You can track the progress bar in real time during conversion.
Is it safe to convert SPX files online?
Yes. All uploaded SPX files and converted M4A results are automatically deleted from our servers within 1 hour after conversion. We do not store, share, or access your files.
Can I convert SPX on iPhone or Android?
Yes, our converter works on all devices and operating systems — iPhone, iPad, Android, Windows, and macOS. Open the site in your mobile browser, upload the SPX file and convert to M4A without installing any app.
