AC3
Dolby Digital Audio
The standard 5.1-channel surround format for DVDs and home theater systems.
Commonly used for
DVD audio, home theater
AC3 to OPUS Converter
Convert AC3 files to OPUS free in your browser — no signup, no install, and the file is never uploaded to a server.
Completely free
Files are never uploaded
No signup required
Drop files or click to select
AC3 → OPUS
What changes in this conversion
- OPUS is a newer format — check that the software or device you are sending it to supports it before switching.
- Both AC3 and OPUS are lossy, so re-encoding discards a little more audio detail on top of what was already lost. Converting once is fine; repeating it many times is not.
How to use
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Add your AC3 file
Drag the AC3 file onto the drop area above, or click it to pick a file from your device. You can add several files at once.
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Confirm OPUS as the output
OPUS is already selected as the output format on this page. You can pick the bitrate — higher keeps more of the sound, lower makes a smaller file.
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Run the conversion
Press the convert button. Audio decodes and re-encodes in your browser — a normal song finishes in a few seconds.
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Download the OPUS file
When it finishes, download the OPUS file. Converting multiple files gives you the option to download them together as a ZIP.
About these formats
OPUS
Opus Audio
A modern codec offering the best efficiency available today for both speech and music. Discord, WhatsApp, and other real-time voice services use it.
Commonly used for
Voice calls, podcasts, low-bandwidth audio
Frequently asked questions
Is converting AC3 to OPUS really free?
Yes. AC3 to OPUS conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.
Are my AC3 files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so the AC3 file never leaves your device. That is also why it works without an internet connection once the page has loaded.
Will the OPUS file open everywhere?
OPUS is a newer format. Current browsers and phones handle it, but older desktop software may not — keep the original AC3 if you have to send it to someone on an old machine.
Is there a file size limit for AC3 to OPUS conversion?
The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.
Convert AC3 files to other formats
Convert other formats to OPUS
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What each file format is, what it is used for, and which formats it can be converted to.
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