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.spx Speex

SPX Converter

Speex is an open speech codec that was used for VoIP and voice notes before Opus replaced it.

  • No upload — 100% private
  • Fast, lossless when possible
  • Free & unlimited
  • Works on iPhone & Android

    Quality
    Advanced options
    Trim (optional)
    Use minutes:seconds, e.g. 1:05.5

    SPX at a glance

    Full nameSpeex
    TypeAudio
    CompressionLossy (compressed)
    Developed byXiph.Org
    Introduced2003
    File extension.spx
    Plays on iPhone✕ No
    Plays on Android◐ Partly / with an app
    Plays on Windows◐ Partly / with an app
    Plays on Mac✕ No

    SPX is best for legacy voice recordings.

    Frequently asked questions

    What is a .spx file?
    Speex is an open speech codec that was used for VoIP and voice notes before Opus replaced it.
    How do I open a SPX file?
    On a computer, VLC Media Player opens almost any .spx file. On phones, the quickest fix is to convert it to MP3 or M4A above. Those formats play in every music app.
    Can I convert SPX for free?
    Yes. The converter on this page is free and unlimited, and it works without uploading anything.