Opus to ALAC (M4A) - Online Audio Converter

Convert Opus to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.

Convert Opus to ALAC (M4A)

[+] Drop Opus audio here or click to select Opus

Output format

ALAC (M4A) (ALAC)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

About Opus to ALAC (M4A)

Convert Opus to ALAC (M4A). Opus adapts from 6 kbps speech to 510 kbps music with low latency. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..

Why convert Opus to ALAC (M4A)?

Larger files than lossy shares with ALAC (M4A) lossless quality.
Keep quality where supported.
Private, no upload - runs in your browser.

Opus vs ALAC (M4A)

Codec	Opus	ALAC
Compression	lossy	lossless
Sample behavior	Quality set by bitrate	Full quality kept
Typical use	Opus adapts from 6 kbps speech to 510 kbps music with low latency.	ALAC is Apple's lossless codec stored inside M4A files.

When not to convert Opus to ALAC (M4A)

Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending Opus files.
Keep a master copy: repeated exports stack small losses, so archive Opus before batch ALAC (M4A) shares.

Limits

Starting point: Opus - Opus adapts from 6 kbps speech to 510 kbps music with low latency. CD-era hardware may not decode it; use MP3 for legacy players. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) from Opus at 256k for music or 128k for speech, starting from the master.

How conversion works

Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.

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FAQ

How do I convert Opus to ALAC (M4A)?

Drop your Opus file onto this page, choose quality and codec settings, then click Convert. The result downloads as ALAC (M4A) instantly. All processing runs in your browser.

What codec is used for ALAC (M4A)?

The default codec for ALAC (M4A) is ALAC. You can change audio parameters in Advanced mode.

How do you store my files?

We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.