Convert M4A to Opus
Turn MPEG-4 audio files (.m4a) into Opus audio (.opus) in seconds. Drop one file or a whole batch: the conversion happens right in your browser, with no sign-up, no watermark and no upload.
Opus to M4A insteadHow to convert M4A to Opus
- 1Drop your M4A files into the box above, or click to choose them.
- 2Opus is already selected. Adjust the options if you like.
- 3Click Convert and download your Opus files.
Good to know
- Opus is compressed, so you can pick a bitrate: higher sounds better, lower makes smaller files.
- Large videos are processed as a stream, so even long files work as long as your device has enough memory.
Frequently asked questions
Is converting M4A to Opus free?
Yes. There is no sign-up, no watermark and no limit on the number of files.
Are my files uploaded?
No. Everything runs in your browser, so your files are never uploaded to a server. That also makes it fast, because nothing has to travel over the network.
Will I lose quality converting M4A to Opus?
No noticeable loss: the conversion keeps the content of your M4A file intact.
Can I convert several files at once?
Yes. Drop as many M4A files as you like. They are converted one after another and you can download them individually or as a ZIP.
Is there a file size limit?
There is no fixed limit. Very large files depend on your device's memory, since the conversion runs locally.
What is M4A?
M4A is AAC audio in an MPEG-4 container, the standard on Apple devices and good quality at small sizes.
What is Opus?
Opus is a modern, efficient audio codec that sounds great even at low bitrates.