.opus — Opus Audio Codec
A modern low-latency audio codec for speech, music, calls, and streaming.
About this format
Opus is a codec designed to handle both speech and music across a wide bitrate range. It is commonly stored in Ogg or WebM containers.
Use Opus when you need excellent quality at low bitrates, especially for voice, real-time audio, or modern web playback.
Real-world samples & file sizes
Four real .opus files, including one native Opus upload and three newly encoded Opus samples from fresh online audio sources. Each card uses a spectrogram generated from the exact file.
Rain Thunder Opus
A weather field recording converted into a compact Ogg Opus audio file.
Thunder Claps Opus
A stereo thunder recording converted into Opus for transient-heavy audio tests.
Tbilisi Pronunciation Opus
A native .opus pronunciation file kept in its original Opus container.
Wilhelm Scream Opus
A very short voice sample converted into Opus for tiny upload checks.
Pros
- +Excellent quality at low bitrates
- +Good for both speech and music
- +Low latency
Cons
- −Not as universally accepted as MP3/AAC
- −Some platforms require Ogg or WebM containers
- −Older devices may not support it
Opus vs other formats
| vs | Size | Quality | Note |
|---|---|---|---|
| MP3 | Opus is smaller at similar quality | Opus usually wins | MP3 still wins for legacy compatibility. |
| AAC/M4A | Often smaller | Strong at speech and low bitrate | AAC is safer in Apple-first workflows. |
Where it works
- Modern desktop players
- Android support
- iOS support depends on container/app
- Chrome
- Firefox
- Edge
- Safari modern versions
- Discord
- WebRTC apps
- VLC
- Audacity
- FFmpeg
Related tools
Frequently asked questions
- Is Opus better than MP3?
- For quality per bit, usually yes. MP3 remains more compatible with very old software.
- Why is my Opus file in .ogg?
- Opus is often stored in the Ogg container, so .ogg and .opus workflows overlap.
Sources
- RFC 6716 - Definition of the Opus Audio Codec - official IETF codec specification
- RFC 7845 - Ogg Encapsulation for Opus - official Opus-in-Ogg mapping