Free online WV to SPX converter

Source format: WV

WV is the file extension for WavPack audio files, a lossless compression format designed to preserve the original audio data exactly. It is used by audiophiles, archivists, and anyone who wants smaller audio files without sacrificing quality. WV files are common in music libraries, backup workflows, and audio mastering projects where exact preservation matters.

Target format: SPX

SPX is an audio file format associated with Speex, a codec originally designed for speech compression. It is optimized for voice recordings, voice chat, and low-bitrate spoken audio rather than high-fidelity music. The main advantages of SPX are efficient compression for speech and relatively small file sizes, but it is not intended for transparent music reproduction.

How to perform the conversion

Converting WV to SPX is usually a transcoding process: the audio must be decoded from WavPack and then re-encoded with the Speex codec. Because these formats serve very different purposes, the result is typically only suitable if the source audio is speech or spoken-word content.

The easiest way is to use a desktop audio tool that supports both formats. One practical option is FFmpeg, which can decode WV and encode Speex in one step. If your file is named input.wv, a typical command is:

ffmpeg -i input.wv -c:a libspeex output.spx

If your FFmpeg build does not include Speex encoding support, you may need a version compiled with libspeex. In some cases, you can first convert WV to a WAV file and then encode that WAV to SPX with another tool that supports Speex.

In a graphical editor or converter that supports both formats, the workflow is usually:

File → Open the .wv file, then choose File → Export or Save as, and select SPX/Speex as the output format.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality and compatibility

WV to SPX is a lossy conversion because SPX uses speech-oriented compression, while WV is lossless. That means the output will not preserve the original audio quality, and repeated conversions will further reduce quality. For music, this conversion is usually a poor choice; for voice recordings, it may be acceptable if small file size is the priority.

Compatibility is another important limitation. SPX support is less common than support for WAV, MP3, or Opus, so make sure the destination device or application can actually play Speex files. If your goal is general playback compatibility, a different target format may be better. If your goal is archival preservation, keep the original WV file because it remains the best-quality copy.