What is Opus (in an Ogg container)?
Opus is the most efficient modern audio codec, used by WhatsApp voice messages, Discord, WebRTC and YouTube.
WhatsApp voice messages are Opus files. To play them in any media player or send them by email, convert Opus to MP3 or M4A.
File extensions: .opusMIME types: audio/opus, audio/ogg
Advantages
- Excellent quality at very low bitrates
- Great for speech and music alike
- Open and royalty free
Disadvantages
- Not supported by many car radios and older players
- Older Apple software cannot open .opus files
- Always resamples to 48 kHz
Typical uses
- Voice messages (WhatsApp, Telegram)
- Video calls and voice chat
- Podcasts at small sizes
Compatibility
Plays in all current browsers, on Android and in VLC; iPhones play it only in newer iOS versions and some apps.
Convert Opus to another format
Convert to Opus from another format
Frequently asked questions
Are my files uploaded to a server?
No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.
Is there a file size limit?
There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.
Will the quality suffer?
That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.