Convert AC3 to MP3
Dolby Digital off the disc, into the format everything plays — downmixed and converted entirely on your own device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
AC-3 is Dolby Digital — the soundtrack format of the DVD and Blu-ray era, and the file you end up holding after demuxing a disc rip, exporting from a home-theater workflow, or pulling audio off a capture card. Receivers love it; almost nothing else does. Your phone, your car, and most music apps will refuse the file outright, which is why the practical move is a one-time convert to MP3, the format every player on earth understands.
Browsers do not decode AC-3 natively, so ConvertUno loads its full decoding engine on first use — a one-time fetch of about 31 MB, cached afterward and working offline from then on. It decodes the Dolby stream, downmixes 5.1 surround to stereo, and writes a 320 kbps MP3. Be clear-eyed about the trade: MP3 has no surround, so the stereo mix is right for headphones and car audio — but keep the AC-3 master if home-theater playback still matters.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Does the MP3 keep the 5.1 surround channels?
No — MP3 has no surround, so the 5.1 mix is downmixed to stereo during conversion. For headphones, laptops, and car stereos that is exactly what you want; nothing there plays 5.1 anyway. If the audio is ever going back through a home-theater receiver, keep the original AC-3 file as your surround master and treat the MP3 as the portable copy.
What quality does the output MP3 use?
320 kbps, the highest bitrate MP3 allows. For a movie soundtrack or concert rip that is transparent for normal listening — the audible difference comes from the downmix to stereo, not the encode. As with any lossy-to-lossy conversion, convert once and keep the result rather than re-converting repeatedly.
Why does the first conversion download something?
No browser decodes AC-3 natively, so the site fetches its own decoding engine on first use — a one-time download of about 31 MB. It is cached after that, so later conversions start instantly and even work offline. Your files still never leave the device; only the engine is downloaded, never anything uploaded.
Is it legal and private to convert my DVD rips?
The conversion itself happens entirely in your browser — no upload, no server, no copies of your files anywhere. Whether ripping a disc is permitted depends on your country's rules on personal backups, which is a question about the rip, not the conversion; this tool simply re-encodes audio you already have on your device.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.