OPUS to M4A converter
Turn OPUS files into M4A for free. The conversion runs entirely in your browser, so your audios are never uploaded anywhere.
How to convert OPUS to M4A
- Add your OPUS files. Drop one or more .opus files on the box above, or tap it to pick them from your device.
- Let it convert. The first audio you convert loads the converter once (about 31 MB, then cached). After that it runs on your device; a progress bar shows how far along it is.
- Download the M4A. Press Download next to each file. Nothing was sent to a server, so close the tab and it's gone.
What is a OPUS file?
Opus is the audio codec used by WhatsApp voice notes, Discord and video calls. It sounds great at very low bitrates.
What is M4A?
M4A is AAC audio in an MP4 container. iPhones save voice memos and iTunes music as M4A.
Why convert OPUS to M4A?
OPUS is great for voice notes and calls, but many players, editors and upload forms don't accept .opus files. M4A is the better choice for Apple devices, with good quality at small sizes; keep in mind some Windows apps, older players and upload forms only take MP3.
Will I lose quality?
M4A uses lossy compression tuned so the difference is invisible to the ear at normal use. We use high-quality settings by default.
Private by design
Most online converters upload your file to their servers. This one doesn't: the converter itself is loaded into your browser and works offline from there, so your audios never leave your phone or computer.
Questions
Is this OPUS to M4A converter free?
Yes, completely free, with no sign-up, no watermark and no daily limit.
Are my OPUS files uploaded?
No. The conversion happens inside your browser on your own device. Nothing is sent to us or anyone else.
Can I convert OPUS to M4A on iPhone or Android?
Yes, in a modern browser. Phones are slower than computers for video, and very long videos can run out of memory on older phones.
Can I convert several files at once?
Yes. Drop as many as you like; they are converted one after another and each gets its own download button.
Is there a file size limit?
No fixed limit, but your browser has to hold the whole file in memory, so files over about 2 GB may fail.