M4A to OPUS Converter
Convert M4A files to OPUS 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 M4A 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 M4A to OPUS
- Click "Choose files" or drag your M4A files onto the page.
- Make sure "OPUS" is selected as the output format (128 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your OPUS files.
Why convert M4A to OPUS?
OPUS may be better supported by your device or app. To keep quality, choose a bitrate equal to or higher than the original M4A.
OPUS is best for voice notes, WhatsApp/Discord audio, podcasts and streaming at small sizes. All modern browsers, Android, iOS 17+, WhatsApp, Discord, Telegram and VLC.
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.
M4A vs OPUS
| M4A | OPUS | |
|---|---|---|
| Full name | MPEG-4 Audio (AAC) | Opus Interactive Audio Codec |
| Type | lossy | lossy |
| Best for | iPhone, iTunes/Apple Music, YouTube uploads and efficient music storage | voice notes, WhatsApp/Discord audio, podcasts and streaming at small sizes |
| Typical size | ~1.4 MB at 192 kbps per minute | ~0.9 MB at 128 kbps per minute |
| Compatibility | Excellent on Apple devices, Android, Windows, browsers and most modern players. | All modern browsers, Android, iOS 17+, WhatsApp, Discord, Telegram and VLC. |
| Developed by | MPEG / Apple (2001) | IETF / Xiph.Org (2012) |
M4A to OPUS: questions
How do I convert M4A to OPUS?
Open this page, add your M4A file, make sure OPUS is selected as the output format and click Convert. Your OPUS file is ready to download in seconds.
Will converting M4A to OPUS 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 M4A to OPUS 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 M4A files to OPUS 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 M4A and OPUS?
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. 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.
Does it work on Mac, Windows, iPhone and Android?
Yes. The M4A to OPUS converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.