Convert Opus voice notes and audio to MP3
This Opus to MP3 converter turns .opus files — and Opus audio inside .ogg, .oga, .webm and .weba files — into MP3. Opus is the codec behind most internet voice: messaging-app voice notes, video calls and many web downloads. It is superbly efficient, but plenty of software still can’t open it, from older phones and car stereos to video editors, transcription services and upload forms. MP3 works everywhere.
The page decodes Opus with your browser’s built-in decoder and encodes MP3 with LAME, all on your device, so private voice messages are never uploaded. Mono output and speech-friendly bitrates keep converted voice notes small.
How to use the Opus to MP3 Converter
- Save the voice note or audio as a file, then drop it on the upload area. .opus, .ogg, .oga, .webm and .weba are all fine.
- For speech, set Channels to Mono and the Bitrate (constant) to 64 or 96 kbps; for music keep stereo at 192 kbps or more.
- Leave Sample rate on Keep original (Opus decodes at 48 kHz) or choose 44.1 kHz if a device or form asks for it.
- Press Convert to MP3.
- Play the MP3 to check it, then download it or save several as a ZIP.
Opus to MP3 Converter features
Every Opus container
Ogg Opus (.opus, .ogg, .oga) and WebM or Matroska Opus (.webm, .weba, .mka) are decoded natively by the browser.
Speech settings
Mono and 64–96 kbps give clear, compact MP3s from voice messages and calls.
48 kHz kept
Opus always decodes at 48 kHz, which MP3 supports directly, so no resampling happens unless you choose 44.1 kHz.
Tags carried over
Title, artist, album and cover art in the Opus file’s comment header are written to the MP3’s ID3 tag.
Batch and ZIP
Convert a whole chat export of voice notes in one pass.
About Opus
Opus was standardised by the IETF in 2012 as RFC 6716, combining Skype’s SILK speech codec with Xiph.Org’s CELT music codec. It switches between them on the fly, runs from 6 to 510 kbps and adds very little delay, which is why it is mandatory in WebRTC and used by most voice and video calling apps. Internally it always works at 48 kHz.
Those strengths make Opus files tiny: a minute of voice message at 24 kbps is about 180 KB. The same minute as a 64 kbps mono MP3 is around 470 KB — still small, and playable everywhere.
Recommended MP3 settings
MP3 is less efficient than Opus, so it needs more bits for the same clarity; the ranges above allow for that.
| Opus source | MP3 bitrate | Channels |
|---|---|---|
| Voice note or call recording | 64–96 kbps | Mono |
| Podcast or lecture | 96–128 kbps | Mono or stereo |
| Music from WebM or .opus | 192–256 kbps | Stereo |
| High-bitrate music (160 kbps+ Opus) | 256–320 kbps | Stereo |
Getting voice notes out of your phone
- In most messaging apps you can export a voice note with Share or Save to Files; in desktop apps, right-click it and save it.
- Some apps name these files .ogg or .oga instead of .opus; the content is the same and converts the same way.
- To transcribe the MP3 or trim it afterwards, see Audio to Text and the Audio Cutter; to make Opus files yourself, use MP3 to Opus.
Opus to MP3 Converter FAQ
How do I convert Opus to MP3?
Drop the .opus file on this page and press Convert to MP3. For voice messages choose Mono and 64–96 kbps first.
Can I convert WhatsApp voice messages to MP3?
Yes. Export the voice message as a file — it is Opus audio, usually named .opus or .ogg — and drop it here.
Why can’t my player open .opus files?
Opus is much newer than MP3, and some devices, older phones, car stereos and editing programs don’t include a decoder for it. MP3 is supported everywhere.
Does Opus to MP3 lose quality?
Slightly, because MP3 re-encodes audio that Opus already compressed. With the bitrates suggested above the difference is hard to hear, especially for speech.
Why is the MP3 at 48 kHz?
Opus always decodes at 48 kHz, and MP3 supports that rate, so the converter keeps it. Choose 44.1 kHz under Sample rate if you need CD-style files.
Can I convert a whole folder of voice notes at once?
Yes. Drop them all together; they are converted one after another, keep their original names with an .mp3 extension, and Download all (ZIP) saves them in one go.
Is it private?
Yes. Decoding and encoding happen in your browser; voice notes never leave your device.