Convert M4A to OPUS offline by JavaScript

Convert M4A to OPUS offline

Convert local M4A files to OPUS files offline by JavaScript in your web browser without any software downloads or file uploads!

Files:

Target:

Audio bitrate:

Sample rate:

Show conversion logs

OUTPUT FILES:

#	File Name	File Size	Actions

How to convert M4A to OPUS offline

Choose local M4A files, choose "OPUS" as target audio format, then click the "CONVERT OFFLINE" button to start offline conversions in bulk. File size can be up to 2GB. Please note this offline audio converter only works in web browsers that support new technologies such as WebAssembly, Shared Array Buffer and Site Isolation.

Name	M4A	OPUS
Full name	Audio-only MPEG-4	Opus Audio Format
File extension	.m4a	.opus
MIME	video/mp4	audio/opus
Developed by	International Organization for Standardization	IETF codec working group
Type of format	Media container	Audio file format
Introduction	MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files.	Opus is a lossy audio coding format developed by Xiph and standardized by the IETF, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low end ARM3 processors.