Convert MP4 to MP3 offline by JavaScript

Convert MP4 to MP3 offline

Convert local MP4 files to MP3 files offline by JavaScript in your web browser without any software downloads or file uploads!

Files:

Target:

Audio bitrate:

Sample rate:

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OUTPUT FILES:

#	File Name	File Size	Actions

How to convert MP4 to MP3 offline

Choose local MP4 files, choose "MP3" 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. Use online converter instead if this offline converter doesn't work in your web browser.

Name	MP4	MP3
Full name	MPEG-4 Part 14	MPEG-1 or MPEG-2 Audio Layer III
File extension	.mp4, .m4a, .m4p, .m4b, .m4r, .m4v	.mp3
MIME	video/mp4	audio/mpeg, audio/MPA, audio/mpa-robust
Developed by	International Organization for Standardization	Fraunhofer Institute
Type of format	Media container	Digital audio
Introduction	MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.	MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is an audio coding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio streaming or storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players.