Discord uses the Opus audio codec for voice communication.
Opus was designed for real-time interactive audio, making it well suited to Discord’s voice channels and calls. It combines technology from the speech-focused SILK codec and the low-latency CELT codec, allowing it to handle both conversation and broader audio efficiently. The format was standardized by the Internet Engineering Task Force in RFC 6716.
Opus is often confused with Vorbis because both are associated with open audio technologies, and with AAC or MP3 because those are familiar general-purpose formats. Discord’s voice system is specifically built around Opus, normally sending stereo audio at a 48 kHz sample rate. Its low delay helps conversations feel immediate, which is essential for gaming and live group calls.