Files with spx file extension may be found as audio files in the special Speex free open source audio codec used mainly to encode speech.

There are 3 other file types using
the SPX file extension!

spx icon.spx - Microsoft FoxPro compiled form source file

spx icon.spx - Apple System Profiler computer information data

empty icon.spx - ArcGIS geodatabase SPX data

Detailed description

Software that works with spx file extension

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SPX file extension - Speex encoded audio

What is spx file? How to open spx files?

File type specification:

Audio and sound file type icon Audio and sound file type

spx file icon: spx filetype icon

Files extension spx is mainly used for Speex encoded audio format, based on open source/free software patent-free project.

Speex is based on CELP and is designed to compress voice at bitrates ranging from 2 to 44 kbps. Some of Speex's features include:

  • Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream
  • Intensity stereo encoding
  • Packet loss concealment
  • Variable bitrate operation (VBR)
  • Voice Activity Detection (VAD)
  • Discontinuous Transmission (DTX)
  • Fixed-point port
  • Acoustic echo canceller
  • Noise suppression

The default software associated to spx file type:

Xiph.Org Foundation logoSpeex  Microsoft Windows software

Company or developer:
Xiph.Org Foundation

Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. 

Help how to open SPX files:

Use VLC media player or any other media player with support of SPX format.

How to convert file with extension SPX:

Possibly may be converted to other audio formats.

File identification strings:

HEX code: 4F 67 67 53 00 02 00 00 00 00 00 00 00 00
ASCII code: OggS

Related links:

Speex official web site - downloads

List of software applications associated to the .spx file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux etc.) and possible program actions
that can be done with the file
: like open spx file, edit spx file, convert spx file, view spx file, play spx file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is ableto perform the specified software action, such as opening, editing or converting spx files.

  • Open spx file
  • Play spx file
  • Record spx file
  • Export spx file

Software that open spx file - Speex encoded audio

Click on the link to get more information about VLC media player for open spx file action.

Microsoft Windows:

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