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SPX is an audio file encoded with the Speex codec, which is designed for compressing speech rather than music. It offers low bitrates and good voice clarity, making it suitable for VoIP, podcasts, and internet telephony. SPX is now largely replaced by Opus.
M4A is an audio file format based on the MPEG-4 standard. It typically uses AAC or ALAC codecs for high-quality sound. M4A is widely supported by Apple devices and offers better compression and quality than MP3 at similar bitrates.
Convert your .spx files to .m4a right in your browser — no downloads, no installs. Everything happens securely in the cloud.
We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.
Turn your SPX files into M4A in just a couple of clicks. No registration, no limits — and it’s 100% free.