Convert AIFF to FLAC 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.

Sizes are comparable: AIFF and FLAC both sit near 10–5 MB per stereo minute, so this conversion is about compatibility, not storage. 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. Nothing is discarded. AIFF and FLAC both preserve the audio exactly; you're changing the container, not the content.

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.

Where does a AIFF file even come from? Usually Logic Pro and GarageBand bounces, old iTunes rips, and Mac sample libraries. The catch is that AIFF is uncompressed like WAV, so a four-minute song is 40 MB+ and won't attach to an email. FLAC is the destination when you need uncompressed, edit-ready audio that every DAW and editor accepts. Sizes are comparable: AIFF and FLAC both sit near 10–5 MB per stereo minute, so this conversion is about compatibility, not storage. Both AIFF and FLAC are lossless, so this specific conversion is bit-perfect: every sample survives and you can go back to AIFF later without any loss.