Convert GSM to SPX
Fast, free GSM to SPX conversion — works in any browser
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gsm
GSM digital audio format
| File extension | .gsm |
|---|---|
| File category | audio |
| Programs | VLC media player Audacity Sox MPlayer |
| Tech description | https://en.wikipedia.org/wiki/Full_Rate |
| MIME type | audio/x-gsm |
| Developer | European Telecommunications Standards Institute (ETSI) |
Developed in Europe, this format was designed for mobile users. GSM is used for audio files that contain a large amount of audio information. Suitable for voice recordings, including recordings of phone calls. You can compress and archive a GSM file to achieve a different file size. The format is mostly used to create and store voice information. There are 4 types of this format that can be opened using different applications.
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 GSM?
Upload your SPX file, select GSM 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 GSM?
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 GSM 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 GSM without installing any app.
