Convert OPUS to M4A
Convert OPUS files to M4A 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 OPUS to M4A
- Drop your .opus files above, or click Upload Files. You can add many files at once.
- M4A 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 .m4a files as soon as each one finishes.
What to know about OPUS to M4A conversion
- Converting a lossy OPUS to M4A cannot restore detail that was already discarded, but it avoids any further loss in later edits.
- You can choose the bitrate, sample rate and channels (mono, stereo or a 3D spatial effect).
OPUS vs M4A
| Feature | OPUS (Opus Audio Codec) | M4A (MPEG-4 Audio) |
|---|---|---|
| Compression | lossy | lossy or lossless |
| Best for | voice, podcasts and streaming at very low bitrates | iTunes, iPhone ringtones and podcasts |
| Opens in | browsers, VLC, Android and WhatsApp-style messaging apps | Apple devices, browsers and most media players |
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.
M4A (MPEG-4 Audio): An audio-only file extension for MPEG-4 files, commonly encoded with AAC or ALAC codecs for high quality.
Conversion options
- Bitrate from 96 to 320 kbps
- Apple Lossless (ALAC) mode
- Sample rate: 22.05, 44.1 or 48 kHz
- Mono, stereo or 3D spatial audio
- Playback speed (0.5× to 2×)
Frequently asked questions
Is it safe to convert OPUS to M4A 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 OPUS 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 M4A to OPUS.
Convert OPUS to other formats
Convert other formats to M4A
- MP4 to M4A
- MP3 to M4A
- WAV to M4A
- MOV to M4A
- FLAC to M4A
- WEBM to M4A
- MKV to M4A
- AAC to M4A
- OGG to M4A
- AVI to M4A
- WMA to M4A
- AIFF to M4A
See every OPUS converter and M4A converter, or browse the full converter directory.