Convert M4A to OPUS online in seconds — free, with no sign-up. OPUS is lossy and ideal for voice, streaming and real-time audio. Your files are encrypted and deleted automatically after 24 hours.
How to convert M4A to OPUS
- 1Upload your M4A file
Click “Choose a file” or drag and drop your M4A file onto the page — no sign-up or email needed.
- 2Convert to OPUS
OPUS is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your OPUS file
Your OPUS file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
M4A vs OPUS
| M4A | OPUS | |
|---|---|---|
| Full name | MPEG-4 Audio | Opus |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Best for | Apple devices; converted to MP3 for universal playback | voice, streaming and real-time audio |
Frequently asked questions
Does converting M4A to OPUS lose quality?
Both M4A and OPUS use compression, so re-encoding discards a little more data. For a single conversion the change is imperceptible to the ear; just avoid repeatedly re-converting the same file.
What's the difference between M4A and OPUS?
MPEG-4 Audio (M4A) is lossy and best for Apple devices; converted to MP3 for universal playback. Opus (OPUS) is lossy and best for voice, streaming and real-time audio. Convert M4A to OPUS when you need a audio for voice.
Is the M4A to OPUS converter free?
Yes — converting M4A to OPUS is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my M4A files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert M4A to OPUS on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert M4A to OPUS?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert M4A files to?
Besides OPUS, you can convert M4A to AAC, AIFF, FLAC, MP3, OGG, WAV and more — see the full list of M4A conversions below.
Other conversions
Last updated July 2026