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

spx icon.spx - Apple System Profiler computer information data

empty icon.spx - ArcGIS geodatabase SPX data

Detailed description

Software that open spx file

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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

The spx files extension is mainly used for Speex encoded audio format, based on open source/free software patent-free project, developed by Xiph.Org Foundation.

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 open spx file:

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. 

VLC media player icon

VideoLAN Project Team logoVLC media player  Microsoft Windows software

Company or developer:
VideoLAN Project Team

Very popular multimedia player developed for Windows, Apple Mac, Linux, Unix and various other operating systems and platforms.

VLC can playback many of the video formats (AVI, MKV, OGV, WMV, ASF, MOV...) and audio formats (MP3, AAC, M4A, OGG, FLAC...) as well as support of subtitles for video. It can also be used as a streaming server and multimedia transcoder.

Help how to open:

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

How to convert:

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, iOS, Android 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 able to perform the specified software action, such as opening, editing or converting spx files.

Software that open spx file - Speex encoded audio

Programs supporting the exension spx on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about VLC media player for open spx file action.

Microsoft Windows:

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