FormatDrop
How-To Guide

How to Convert AIFF to MP3

AIFF files are huge — a 4-minute song at CD quality is about 40 MB as AIFF, versus 5 MB as MP3 at 192 kbps. Converting AIFF to MP3 makes your audio files portable and practical without noticeable quality loss at good bitrates.

Open AIFF to MP3 Converter

Step-by-step instructions

  1. 1

    Convert with iTunes/Music on Mac

    Preferences → Files → Import Settings → MP3 Encoder → 256 kbps → OK. Drag AIFF into library → right-click → Create MP3 Version → Show in Finder.

    Go to converter
  2. 2

    Use FFmpeg (all platforms, best control)

    ffmpeg -i input.aiff -c:a libmp3lame -b:a 320k output.mp3. For variable bitrate (VBR): ffmpeg -i input.aiff -c:a libmp3lame -q:a 0 output.mp3 (q:a 0 = highest VBR quality).

  3. 3

    Convert with Audacity

    Open Audacity → File → Import → Audio → select AIFF → File → Export → Export as MP3 → choose bitrate → Save. Audacity lets you edit the audio before exporting.

  4. 4

    Batch convert AIFF files

    Mac/Linux: for f in *.aiff; do ffmpeg -i "$f" -c:a libmp3lame -b:a 320k "${f%.aiff}.mp3"; done.

Why convert AIFF to MP3?

AIFF is a lossless uncompressed format used in professional audio on Mac. It produces massive files impractical for sharing and mobile playback. MP3 at 320 kbps is perceptually transparent and 8× smaller.

Your files never leave your device

FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.

Frequently asked questions

Will I hear a difference between AIFF and 320 kbps MP3?
In controlled double-blind tests, most listeners cannot reliably distinguish 320 kbps MP3 from AIFF at CD quality. The psychoacoustic model discards frequencies the ear masks anyway. For production, keep AIFF; for listening, 320 kbps MP3 is transparent.
Should I convert AIFF to FLAC instead of MP3?
If you want lossless quality with smaller files (FLAC is 30–50% smaller than AIFF), then yes. FLAC is lossless; MP3 is lossy. Use FLAC for archiving, MP3 for mobile and sharing.
Convert AIFF to MP3 Now — Free

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