01
ADD YOUR M4A
Drop the M4A file into the box above or choose it from your device.
M4A → OPUS / online converter
M4A to OPUS Converter
Convert M4A to Opus for much smaller voice or music files.
01 / how to
How to convert M4A to OPUS
02
CONVERT TO OPUS
OPUS is already selected. Press Convert and wait a few seconds.
03
DOWNLOAD
Save the finished OPUS file. The original is deleted from our server.
02 / what you get
What happens to your data
Kept
- Both AAC and Apple Lossless (ALAC) M4A files are supported
- iPhone voice memos and iTunes / Apple Music files work
- Saved as Opus at 128 kbps, which usually sounds as good as a much larger MP3
- Title, artist and album tags are carried over
Good to know
- Copy-protected (DRM) files cannot be converted.
- Opus always runs at 48 kHz, so other sample rates are converted.
- Older players and some Apple apps cannot open .opus. Use MP3 or M4A there.
- Embedded cover art is not carried over. Only the sound is converted.
- Lossy compression permanently removes some detail. Keep your original if you want to archive the recording.
03 / formats
M4A vs OPUS
M4A
An M4A file is a compressed audio format (usually AAC inside an MP4 container) used by Apple's ecosystem — iTunes, Apple Music, and voice memos on iPhone all default to it. Slightly better quality than MP3 at the same file size.
Used in: Apple Music & iTunes · iPhone voice memos · Audiobooks
OPUS
An OPUS file uses one of the most efficient audio codecs available today — smaller files than MP3 at equal quality, especially good for voice. It's what WhatsApp voice messages and Discord calls use under the hood.
Used in: Voice messages (WhatsApp) · Discord & voice calls · Modern streaming
04 / more
More conversions
Have a different file? Open the main converter — it detects the format for you.