OPUS M4A

OPUS to M4A Audio Converter

Drop your OPUS files — the M4A audio is generated in your browser in seconds. Multiple files at once, no upload on the fast path.

4.8/5

9,214+ audio files converted

From
To

This tool turns your audio into M4A entirely in the browser. MPEG-4 audio container, usually holding AAC (lossy) or ALAC (lossless). The format iTunes and Apple Music download in. You can convert several files at once, and because the fast path is local there is no upload step and nothing to clean up afterwards.

For developers

Looking to programmatically convert OPUS to M4A?

Same engine, available as a JSON API. Drop a file or URL via REST and get the converted audio back — no browser, no UI, no rate limits on paid tiers.

  • Fast response on common audio pairs

  • Webhook delivery for batch jobs

  • Dozens of audio format pairs supported

Side-by-side

OPUS vs M4A: how they compare

The numbers and capabilities at a glance, so you know what you're trading.

Opus

Year released
2012
Compression
Lossy
Lossless
No
Channels
Multichannel
Player support
Wide
Best for
Voice & low-bitrate streaming

M4A

Year released
2001
Compression
Lossy (AAC) or Lossless (ALAC)
Lossless
No
Channels
Multichannel
Player support
Apple ecosystem
Best for
Apple Music & iTunes downloads
Heads up

Heads up before converting to M4A

What this specific conversion changes about your audio.

Re-encoding Opus to M4A stacks compression

Both Opus and M4A are lossy, so converting between them compresses already-compressed audio and can add artifacts. When possible, convert from the original lossless master instead of from another lossy file.

Best practice

Best practices for M4A

Small choices that keep your output sounding right.

  • Play the first converted file before batch-converting the rest, so you catch a wrong setting early.
  • For M4A, choose a bitrate that fits the use: 192–256 kbps keeps most music transparent, 320 kbps for archival-grade lossy.
  • Check that title, artist, album and cover art survived the conversion; some players cache old tags.
Deep dive

The importance of a good audio conversion

Why getting OPUS → M4A right matters more than you think.

FAQ

Frequently asked

The basics everyone asks before dropping a track.