OPUS to M4A Converter
Convert OPUS files to M4A in seconds, right in your browser. Drop in one file or a whole folder, pick your quality settings and download - nothing is uploaded to a server.
Drop OPUS files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert OPUS to M4A
- Click "Choose files" or drag your OPUS files onto the page.
- Make sure "M4A" is selected as the output format (192 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your M4A files.
Why convert OPUS to M4A?
M4A may be better supported by your device or app. To keep quality, choose a bitrate equal to or higher than the original OPUS.
M4A is best for iPhone, iTunes/Apple Music, YouTube uploads and efficient music storage. Excellent on Apple devices, Android, Windows, browsers and most modern players.
Will I lose quality?
Converting between two lossy formats re-encodes the audio, which can add a small amount of loss. Use a bitrate at least as high as the original (192 kbps or more) to keep it transparent.
OPUS vs M4A
| OPUS | M4A | |
|---|---|---|
| Full name | Opus Interactive Audio Codec | MPEG-4 Audio (AAC) |
| Type | lossy | lossy |
| Best for | voice notes, WhatsApp/Discord audio, podcasts and streaming at small sizes | iPhone, iTunes/Apple Music, YouTube uploads and efficient music storage |
| Typical size | ~0.9 MB at 128 kbps per minute | ~1.4 MB at 192 kbps per minute |
| Compatibility | All modern browsers, Android, iOS 17+, WhatsApp, Discord, Telegram and VLC. | Excellent on Apple devices, Android, Windows, browsers and most modern players. |
| Developed by | IETF / Xiph.Org (2012) | MPEG / Apple (2001) |
OPUS to M4A: questions
How do I convert OPUS to M4A?
Open this page, add your OPUS file, make sure M4A is selected as the output format and click Convert. Your M4A file is ready to download in seconds.
Will converting OPUS to M4A lose quality?
Converting between two lossy formats re-encodes the audio, which can add a small amount of loss. Use a bitrate at least as high as the original (192 kbps or more) to keep it transparent.
Is this OPUS to M4A converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many OPUS files to M4A at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between OPUS and M4A?
OPUS (Opus Interactive Audio Codec) is a compressed (lossy) format, the most efficient modern lossy codec. Opus delivers excellent quality at very low bitrates for both speech and music. M4A (MPEG-4 Audio (AAC)) is a compressed (lossy) format: aAC audio in an MPEG-4 container. Better quality than MP3 at the same bitrate and the native format of Apple Music and iTunes.
Does it work on Mac, Windows, iPhone and Android?
Yes. The OPUS to M4A converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.