Convert M4A to OPUS
M4A is great for high-quality music and voice recordings for Apple and Android devices, but OPUS is the better choice for voice messages, calls and streaming at low bitrates. Convert M4A to OPUS in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert M4A to OPUS
- 1
Tap Choose files and select one or more M4A files (or drag them in).
- 2
Check that OPUS is selected. Use Advanced options for bitrate, channels or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your OPUS downloads automatically. Converting several files? Grab them all as a ZIP.
M4A vs OPUS
Both formats are lossy, so the audio is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| M4A | OPUS | |
|---|---|---|
| Full name | MPEG-4 Audio (AAC) | Opus Audio |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | Apple / MPEG | IETF / Xiph.Org |
| Introduced | 2001 | 2012 |
| Plays on iPhone | ✓ Yes | ◐ Partly / with an app |
| Plays on Android | ✓ Yes | ✓ Yes |
| Plays on Windows | ✓ Yes | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About M4A and OPUS
M4A: M4A is an MPEG-4 container holding AAC audio. It sounds better than MP3 at the same size and is the default format for iPhone voice memos, Apple Music downloads and many Android recorders.
OPUS: Opus is a modern, highly efficient codec used by WhatsApp voice notes, Discord, Zoom and WebRTC calls. It sounds excellent even at very low bitrates.
Frequently asked questions
How do I convert M4A to OPUS on my phone?
Will converting M4A to OPUS reduce quality?
Is this M4A to OPUS converter free?
Are my files uploaded to a server?
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