How to use it
- Add your files. Drop MP3 files on the page or use Choose files. Folders and ZIPs work too.
- Check that AC3 is selected. AC3 is already chosen on this page.
- Adjust options if you need to. Quality, size and other settings appear when the format has them.
- Convert and download. Press Convert; with several files, “Download all” gives you one ZIP.
What happens to your file
The audio is decoded and encoded as AC3 at the bit rate you choose.
AC3 is lossy, so pick a bit rate at least as high as the original’s to avoid audible loss.
About MP3 and AC3
MP3: MP3 is the universal audio format: every phone, car stereo and app plays it.
AC3: AC3 (Dolby Digital) is the surround-sound audio of DVDs and TV broadcasts.
Questions
Is my MP3 file uploaded?
No. The conversion runs inside this browser tab, and the AC3 is created on your device. Nothing is sent to a server.
Is there a file size limit?
No fixed limit: files are processed by your device, so very large videos depend on its memory. Computers handle several GB; phones are best with smaller files.
Can I convert several MP3 files at once?
Yes. Drop as many as you like, a folder or a ZIP; “Download all” saves every AC3 in one ZIP.