Convert AAC to OPUS
AAC is great for efficient music files and broadcast audio, but OPUS is the better choice for voice messages, calls and streaming at low bitrates. Convert AAC 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 AAC to OPUS
- 1
Tap Choose files and select one or more AAC 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.
AAC 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.
| AAC | OPUS | |
|---|---|---|
| Full name | Advanced Audio Coding (raw ADTS) | Opus Audio |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | MPEG | IETF / Xiph.Org |
| Introduced | 1997 | 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 AAC and OPUS
AAC: AAC is the successor to MP3 and the audio codec behind YouTube, iTunes and most streaming services. A .aac file stores the raw AAC stream without an MP4 wrapper.
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 AAC to OPUS on my phone?
Will converting AAC to OPUS reduce quality?
Is this AAC to OPUS converter free?
Are my files uploaded to a server?
Rate this tool
Be the first to rate it.
Thanks for rating! ❤️