Guide · macOS

How to convert an AIFF file to MP3 on Mac

AIFF is Apple's uncompressed audio format: beautiful for editing, but huge for everyday use. Here's the fastest way to turn AIFF into MP3 on a Mac, without opening Apple Music, installing Audacity, or touching Terminal.

The quick way (no install)

1. Open filewhirl.com/aiff-to-mp3 in Safari, Chrome, or Firefox on your Mac.
2. Drag your .aiff or .aif file from Finder into the upload area.
3. FileWhirl runs ffmpeg locally and converts it to MP3, no paid API in the loop.
4. Click download. The MP3 lands in ~/Downloads, ready for QuickTime, the Music app, your phone, or anywhere else.

That's it. A typical AIFF shrinks to roughly a tenth of its original size as a high-bitrate MP3, with audio quality that's hard to tell apart.

Why not just use the Music app?

You can convert AIFF to MP3 in Apple Music (File → Convert → Create MP3 Version), but it requires adding the file to your library, changing import settings, and clutters the app with files you didn't want there. FileWhirl skips that. Drop the file, get the MP3.

Batch converting a folder of AIFFs

Select all the AIFFs in Finder and drag them in together. FileWhirl converts them in one session and bundles the MP3s for download, with no signup: free covers 10 a day, up to 100 MB a file.

Privacy on a Mac

Uploads go to a private bucket and auto-delete after 1 hour. Files never touch a third-party converter, and nothing is installed on your Mac.

FAQ

Does this work on older macOS versions?

Yes. Anything that runs a modern Safari, Chrome, or Firefox will work.

What bitrate does the MP3 use?

A high-bitrate setting that preserves perceived quality while keeping the file compact.

Can I convert AIFF to MP3 for free?

Yes. FileWhirl's AIFF to MP3 tool is free with no signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.