How to convert a .SPX file online
Three steps, all tab.
Open your file
Drop your .SPX file and every video, audio and subtitle track inside is listed with its codec, resolution, frame rate and language.
Preview
See frames from across your .SPX file before you convert, even when your browser can't play the codec inside.
Convert
Pick MP4, WEBM or MP3, or repack to MKV without re-encoding. Play the result right here, then download it.
What is a .SPX file?
Everything worth knowing about Ogg Speex Audio File.
An SPX file is a voice or speech audio recording encoded with the Speex codec inside an Ogg container. Open it with VLC (free, all platforms); drag the file onto VLC and it plays. Speex was superseded by Opus in 2012, but SPX files still appear in archived VoIP recordings and older podcasts.
Programs that open .SPX files
- Windows
- Foobar2000, VLC media player, Audacity
- macOS
- VLC media player
- Linux
- VLC media player, xine
- Android
- VLC for Android
| Full name | Ogg Speex Audio File |
|---|---|
| Developer | Xiph.Org Foundation (Jean-Marc Valin, principal author) |
| First released | 2002 (Speex 1.0 beta 1) |
| Category | Audio & Video |
| MIME type | audio/x-speex |
| Signature | 4F 67 67 53 00 02 (OggS - Ogg page capture pattern) |
Related viewers
Other free tools to open and preview your files.
Is my .SPX file uploaded to a server?
No. Your .SPX file is converted for you. The converted file is created in memory,.
Why is conversion slower than desktop software?
Browsers give web pages a single CPU core for this kind of work and no hardware video encoder. Short clips convert in seconds; for long 4K films a desktop app like HandBrake is faster. Use Start and Length to convert just the part you need.
Which output format should I pick?
MP4 plays on every phone, TV and browser. WEBM is an open format that's great for the web. MP3 keeps only the sound. MKV (no re-encode) is instant and lossless, but only changes the container.
Can I keep all audio tracks and subtitles?
The MKV (no re-encode) option copies every track as-is. MP4 and WEBM keep the first video and audio track, which is what most players use.
Why can't some files be converted?
Files protected with DRM (for example purchased iTunes .m4p songs or some .wmv rentals) are encrypted. We can show what's inside, but nobody can convert them without the key.
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