Convert MP3 to OPUS
Convert MP3 files to OPUS locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert MP3 to OPUS
- Drop your .mp3 files above, or click Upload Files. You can add many files at once.
- OPUS is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .opus files as soon as each one finishes.
What to know about MP3 to OPUS conversion
- Opus always runs at 48 kHz, so the sample rate is converted automatically.
- You can choose the bitrate, sample rate and channels (mono, stereo or a 3D spatial effect).
MP3 vs OPUS
| Feature | MP3 (MPEG-1 Audio Layer III) | OPUS (Opus Audio Codec) |
|---|---|---|
| Compression | lossy | lossy |
| Best for | music libraries and playback on any device | voice, podcasts and streaming at very low bitrates |
| Opens in | every phone, car stereo, browser and media player | browsers, VLC, Android and WhatsApp-style messaging apps |
MP3 (MPEG-1 Audio Layer III): The most popular lossy audio compression format, which revolutionized digital music sharing.
OPUS (Opus Audio Codec): A highly versatile, open-source lossy audio format developed by the Xiph.Org Foundation, optimized for speech and high-fidelity streaming.
Conversion options
- Bitrate from 96 to 320 kbps
- Mono, stereo or 3D spatial audio
- Playback speed (0.5× to 2×)
Frequently asked questions
Is it safe to convert MP3 to OPUS here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several MP3 files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert OPUS to MP3.
Convert MP3 to other formats
Convert other formats to OPUS
- MP4 to OPUS
- WAV to OPUS
- MOV to OPUS
- M4A to OPUS
- FLAC to OPUS
- WEBM to OPUS
- MKV to OPUS
- AAC to OPUS
- OGG to OPUS
- AVI to OPUS
- WMA to OPUS
- AIFF to OPUS
See every MP3 converter and OPUS converter, or browse the full converter directory.