MP3 to OPUS converter
Turn MP3 files into OPUS in seconds, inside this tab. Nothing is uploaded.
- Runs on your device
- No upload
- No sign-up
- Free
Drop MP3 files here (any other format works too)
Stays on this device: nothing is uploaded. You can also drag a file here or paste it.
OPUS: voice notes, speech at tiny sizes, web audio.
How to convert MP3 to OPUS
- Choose your .mp3 files or drop them on the box above. You can add several.
- OPUS is already selected. Leave the bitrate at 192 kbps or change it.
- Conversion starts straight away. Press Download next to each finished file, or Download all.
MP3 vs OPUS
| MP3 | OPUS | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Opus in an Ogg container |
| Type | lossy | lossy |
| Codec | MP3 (LAME encoder) | Opus |
| Size | 0.96 MB at 128 kbps, 2.4 MB at 320 kbps | about 0.7 MB at 96 kbps |
| Plays on | Everywhere: every phone, browser, car and media player made in the last 25 years | Chrome, Firefox, Android, VLC, iOS 17+; older apps may refuse it |
MP3. MP3 throws away sound the ear is unlikely to notice, using a psychoacoustic model, so a song shrinks to roughly a tenth of its CD size.
OPUS. Opus is the codec behind WhatsApp voice notes, Discord and WebRTC calls. It is the most efficient lossy codec here, especially for speech.
What happens to quality
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible. What bitrate really means.
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Questions people ask
How do I convert MP3 to OPUS without uploading?
Choose or drop your .mp3 file above. AudioKit converts it to OPUS inside your browser with ffmpeg.wasm and gives you a download. The file is never sent to a server, and you can convert several at once.
Will I lose quality converting MP3 to OPUS?
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible.
What bitrate should I choose for OPUS?
192 kbps is a good default. Going above the source file’s bitrate doesn’t improve sound, it only makes the file larger. For voice recordings, 96–128 kbps is plenty.
Where does MP3 play and where does OPUS?
MP3: Everywhere: every phone, browser, car and media player made in the last 25 years. OPUS: Chrome, Firefox, Android, VLC, iOS 17+; older apps may refuse it.
Is this MP3 to OPUS converter safe?
It’s about as private as a converter can be: nothing is uploaded, there is no account and no installer. The page needs a modern browser with WebAssembly (any current Chrome, Edge, Firefox or Safari).