Convert AIFF 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.

Storage-wise you're looking at about 8× less: 10 MB per minute becomes roughly 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.

AIFF files typically come from Logic Pro and GarageBand bounces, old iTunes rips, and Mac sample libraries — and AIFF is uncompressed like WAV, so a four-minute song is 40 MB+ and won't attach to an email. Single clean encode from a full-quality source — the best-case scenario for a lossy format, with no inherited artifacts.

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.

AIFF is the format of Logic Pro and GarageBand bounces. It plays where it was made, but AIFF is uncompressed like WAV, so a four-minute song is 40 MB+ and won't attach to an email. M4A is the destination because it plays essentially everywhere — iPhone Voice Memos and every ordinary phone, browser, and player. Storage-wise you're looking at about 8× less: 10 MB per minute becomes roughly 1.2. Because AIFF is uncompressed, 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.