Convert AC3 to OPUS
AC3 is great for home theatre and surround sound, but OPUS is the better choice for voice messages, calls and streaming at low bitrates. Convert AC3 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 AC3 to OPUS
- 1
Tap Choose files and select one or more AC3 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.
AC3 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.
| AC3 | OPUS | |
|---|---|---|
| Full name | Dolby Digital (AC-3) | Opus Audio |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | Dolby Laboratories | IETF / Xiph.Org |
| Introduced | 1991 | 2012 |
| Plays on iPhone | ◐ Partly / with an app | ◐ Partly / with an app |
| Plays on Android | ◐ Partly / with an app | ✓ Yes |
| Plays on Windows | ✓ Yes | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About AC3 and OPUS
AC3: AC3 is Dolby Digital surround sound, used on DVDs, Blu-rays and TV broadcasts. It supports up to 5.1 channels.
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 AC3 to OPUS on my phone?
Will converting AC3 to OPUS reduce quality?
Is this AC3 to OPUS converter free?
Are my files uploaded to a server?
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