AC3 to OPUS converter
A free AC3 to OPUS converter for Dolby Digital files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your AC3 files here
or browse your device · paste with Ctrl+V
Accepts .ac3 files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your AC3 files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
OPUS is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your OPUS
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
AC3
Dolby DigitalThe 5.1 surround standard for DVD, Blu-ray and broadcast television. Convert it to stereo AAC or MP3 when you need it to play on headphones and phones.
- Developed by
- Dolby Laboratories
- Released
- 1991
- Extension
- .ac3
- MIME type
- audio/ac3
- Compression
- Lossy
OPUS
Opus Interactive Audio CodecThe best-performing lossy codec available, and an IETF standard. It handles speech at 24 kbps and full music at 128 kbps equally well, which is why WhatsApp, Discord and every WebRTC call use it.
- Developed by
- IETF / Xiph.Org
- Released
- 2012
- Extension
- .opus
- MIME type
- audio/opus
- Compression
- Lossy
- Specification
- Open
- Both AC3 and OPUS are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
Questions about converting AC3 to OPUS
Is this AC3 to OPUS converter free?
Yes. Converting AC3 to OPUS here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my AC3 file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for AC3 to OPUS?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Does converting AC3 to OPUS lose quality?
OPUS is a lossy format, so some detail is discarded when it is encoded. At the default quality setting the change is often not visually obvious; keep your original AC3 file if you might need it again.
Can I convert several AC3 files to OPUS at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does AC3 to OPUS work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to OPUS
41 formats can become OPUS here.
Convert AC3 to other formats
A AC3 file can become any of these.
OPUS to AC3
The reverse conversion
MP4 to OPUS
MP3 to OPUS
WAV to OPUS
Extract Audio from Video
Pull the soundtrack out of a video as an MP3.…
Compress Audio
Lower the bitrate of audio files to save space.…
Trim Audio
Cut a section out of an audio file.…
Normalise Audio
Even out loudness across files so nothing is jarring…