Turn an Opus audio file into a universally compatible MP3.
The Opus to MP3 converter turns Opus audio (Opus (RFC 6716), usually in an Ogg or WebM container) into MP3 (MPEG-1/2 Layer III) directly in your browser. Opus (from WhatsApp, Discord and WebRTC recordings) is not understood by older players and many editors.
Opus is the most efficient modern codec for speech and music, used by WhatsApp voice notes, Discord, YouTube and WebRTC; transparent quality from about 96 kbps. MP3 is the most universally supported lossy format; plays on virtually every phone, car stereo, browser and editor. Both Opus and MP3 are lossy, so this is a transcode: some extra quality is lost. Pick a bitrate at or above the original’s to limit the damage, and keep the original file.
Your file is decoded to 32-bit floating-point samples by the browser’s own audio decoder — and at the file’s own sample rate, not a resampled one. You can optionally resample or switch channels. It is then encoded to MP3 on your device; for a lossy target the result is decoded again for the preview, so you hear what you will get. Typical size: about 1 MB per minute at 128 kbps, 2.4 MB at 320 kbps.
Source format facts: Opus files are lossy; usual bandwidth: up to 20 kHz (fullband). Target facts: MP3 is lossy; usual bandwidth: typically low-passed at 16–20 kHz depending on bitrate.
Convert .opus messages to MP3 to share anywhere.
Convert recorded chats.
Save call recordings as MP3.
Universal playback.
| From | Opus — Opus (RFC 6716), usually in an Ogg or WebM container |
|---|---|
| To | MP3 — MPEG-1/2 Layer III |
| Direction | lossy → lossy |
| Typical size | about 1 MB per minute at 128 kbps, 2.4 MB at 320 kbps |
| Tags | Opus: Opus tags → MP3: ID3 |
At equal bitrate, yes.
Slightly; lossy to lossy.
Going to WAV is lossless. Going to MP3 uses a standard 192kbps encode by default (adjustable), which is transparent for most listening but is a lossy step if your source was uncompressed.
No — the file is decoded and re-encoded entirely in your browser using the Web Audio API and, for MP3, a small bundled encoder. Nothing is sent anywhere.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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