FormatDrop
Audio Format

Opus

Opus Audio Codec

Opus is a modern open-source audio codec developed by Xiph.org and Mozilla. It powers voice and audio in Discord, Zoom, Google Meet, and every WebRTC application. It delivers remarkable audio quality at very low bitrates — outperforming MP3 at every bitrate — but almost no consumer software plays .opus files outside a browser.

What is Opus?

Opus is an audio codec standardised by the IETF (Internet Engineering Task Force) in 2012 (RFC 6716). It was developed jointly by Xiph.org (the creators of Vorbis, FLAC, and OGG) and Mozilla. Technically, Opus combines two encoding approaches: the SILK codec (developed by Skype for voice) for low-bitrate voice content, and the CELT codec (from Xiph) for music and higher-quality audio. The switch between these modes is seamless and dynamic. Opus is royalty-free, open-source, and patent-clear — a major advantage over MP3 (expired patents) and AAC (licensed). It achieves better audio quality than MP3 at every bitrate: at 64 kbps, Opus sounds better than MP3 at 128 kbps. At 32 kbps, it still produces intelligible, good-quality speech. This is why it became the standard for real-time communications: Discord uses Opus for voice channels, Zoom uses it for audio, and all WebRTC implementations (including Chrome and Firefox) use it for calls. Opus files are typically stored in .ogg or .opus containers (WebM containers for WebM video). Despite its technical superiority, .opus files simply don't play in most consumer applications.

Opus pros and cons

Advantages

  • Better quality than MP3 at every bitrate
  • Excellent for voice at very low bitrates (16–32 kbps)
  • Royalty-free and open-source
  • Low latency — designed for real-time communication
  • Handles both voice and music in the same codec
  • Native support in all modern browsers

Limitations

  • Most media players and music apps cannot play .opus files
  • iTunes and Apple Music do not support Opus
  • Windows Media Player does not support Opus
  • Car stereos and Bluetooth speakers generally don't support Opus
  • Podcast hosting platforms typically require MP3
  • Not supported by most streaming services for upload

When should you convert Opus files?

Convert Opus to MP3 when you need to play audio in any application outside a browser, share audio files with others, upload to podcast platforms, or play audio in a car stereo. MP3 is universally supported everywhere. If you received an .opus file from a Discord download, screen recording, or WebRTC export, converting to MP3 will make it playable everywhere without any special software.

Convert Opus files

OPUS→MP3

All FormatDrop conversions run entirely in your browser — no file upload, no server processing. Your files stay on your device.

Opus FAQ

What programs can play Opus files?
VLC media player plays Opus files on all platforms. In browsers, Firefox, Chrome, and Edge all support Opus natively in audio elements. foobar2000 (Windows) and mpv (cross-platform) also support Opus. Unfortunately, Windows Media Player, iTunes, Apple Music, and most consumer media players do not support Opus without additional codec packs. If you need to play an Opus file without VLC, converting to MP3 is the most practical solution.
Is Opus better than MP3?
Technically yes — Opus achieves better audio quality than MP3 at every bitrate, and the difference is most pronounced at low bitrates. At 64 kbps, Opus sounds comparable to MP3 at 128 kbps. At 128 kbps, Opus is nearly indistinguishable from lossless for most listeners. However, MP3 has unmatched compatibility: every device, app, and platform on earth plays MP3. For use cases where you control the player (a website, an app), Opus is the superior choice. For anything you need to share broadly, MP3's compatibility wins.
Why is my audio file in Opus format?
Opus audio most commonly comes from: (1) Discord voice message downloads or recordings — Discord uses Opus for all voice, (2) Screen recordings made in Chrome or Firefox — the browser's MediaRecorder API defaults to Opus in a WebM container, (3) Exported recordings from Zoom, Google Meet, or other WebRTC apps, or (4) Downloads from web audio players that serve Opus for efficiency. In all these cases, converting to MP3 will make the file playable everywhere.

More formats

HEICWebPAVIFEPUBWebM