You can drag and drop it too — we’re flexible!
We’ll take care of the rest — it only takes a few seconds.
Just download it and enjoy. Easy, right?
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.
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.
Convert your .m4a files to .spx 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 M4A files into SPX in just a couple of clicks. No registration, no limits — and it’s 100% free.