Convert MP4 to SPX
Fast, free MP4 to SPX conversion — works in any browser
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mp4
The format within the MPEG-4 Part 14 standard
| File extension | .mp4 .m4v |
|---|---|
| File category | video |
| Programs | VLC media player Windows Media Player Apple QuickTime Player MPV Kodi |
| Tech description | https://en.wikipedia.org/wiki/MPEG-4_Part_14 |
| MIME type | video/mp4 |
| Developer | MPEG group (ISO/IEC) |
Created in 1988, it was intended for video files. A file of this format contains video and audio information, images and subtitles. When compressed, the files do not lose quality. The format includes various types of multimedia content: videos, animations, audio, 2D and 3D graphics. Files of this format can be used and viewed on the Internet. In this case, a metadata transfer takes place. The full name of the format is MPEG-4 Part 14.
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 MP4?
Upload your SPX file, select MP4 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 MP4?
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 MP4 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 MP4 without installing any app.
