Convert FLAC to M4A Online

"Online converter" normally means uploading your file to someone's server, waiting in a queue, and downloading the result. This page inverts that: it loads FFmpeg compiled to WebAssembly into your browser and does the work on your own machine. You keep the convenience of online — nothing to install, works on any OS — without the upload.

Expect roughly 4× smaller: FLAC runs about 5 MB per minute, M4A about 1.2. That matters here, because transfer is where server-based converters spend most of their time. With no upload and no download of the result, what's left is just the conversion itself: usually a second or two.

FLAC files typically come from CD rips, hi-res download stores, and archival libraries — and FLAC is lossless but poorly supported outside audiophile software — Apple's Music app won't touch it. Because FLAC is lossless, this is the ideal encode: the encoder sees the complete original signal, so the M4A is the cleanest that audio can produce.

Because it's a web page rather than software, the same converter runs on Windows, macOS, Linux, ChromeOS, iPhone, and Android — with nothing to keep updated and none of the bundled adware that comes with downloadable free converters.

FLAC files come from CD rips, hi-res download stores, and archival libraries. FLAC is lossless but poorly supported outside audiophile software — Apple's Music app won't touch it — which is the whole reason this conversion exists. M4A is the destination because it plays essentially everywhere — iPhone Voice Memos and every ordinary phone, browser, and player. Expect roughly 4× smaller: FLAC runs about 5 MB per minute, M4A about 1.2. Because FLAC is lossless, encoding to M4A here is the clean, single-generation case — the encoder sees the whole original signal, so this M4A is as good as the format gets.