Convert an Audio File Without Software on Mac and Windows

Updated on 01/10/2026

Downloadable audio converters are often bloated, stuffed with unwanted toolbars or paid beyond 3 files. Typical online converters, on the other hand, upload your files to their servers. There is a third way: conversion in the browser, thanks to FFmpeg compiled to WebAssembly. That is what m4atomp3.fr does.

Comparison of methods

Method	Free	Private files	Installation	Batch
m4atomp3.fr (browser)	Yes, unlimited	Yes, nothing is uploaded	None	Yes + zip
Typical online converters	Limited (size, files/day)	No, uploaded to a server	None	Often paid
iTunes / Music (Mac)	Yes	Yes	Preinstalled on Mac	Yes but tedious
VLC	Yes	Yes	Must install	One at a time
Audacity	Yes	Yes	Must install + plugin	Yes (macros)
FFmpeg (command line)	Yes	Yes	Must install	Yes (scripts)

With the browser (all platforms)

Go to m4atomp3.fr, drop your files, choose the output format (MP3, M4A, WAV, FLAC, OGG, OPUS, AAC, AIFF) and convert. Works in recent versions of Chrome, Edge, Firefox and Safari, on Windows, Mac, Linux, iPhone and Android.

With FFmpeg, for advanced users

# M4A → MP3 192 k
ffmpeg -i input.m4a -c:a libmp3lame -b:a 192k output.mp3
# A whole folder (bash)
for f in *.m4a; do ffmpeg -i "$f" -c:a libmp3lame -b:a 192k "${f%.m4a}.mp3"; done

That is exactly the engine running in your browser on this site, with nothing to install.

🎵 Ready to convert? Drop your files on the home page: free, no sign-up, and nothing is sent over the internet.

Convert an Audio File Without Software on Mac and Windows

Comparison of methods

With the browser (all platforms)

With FFmpeg, for advanced users

Other guides