Convert AIFF to MP3
You convert AIFF to MP3 by dragging the .aiff file into the dropzone here and pressing the button, which encodes the MP3 locally. ffmpeg compiled to WebAssembly does the work inside your browser, meaning even a big studio export is converted on your machine and is never uploaded.
Runs in your browser. Your file never leaves your device.Drop your AIFF hereChoose a AIFF to convert
It becomes a MP3 right in your browser, up to 200 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 200 MB |
Why convert AIFF to MP3?
AIFF is Apple's uncompressed PCM format, the Mac counterpart to WAV, and it pours out of GarageBand, Logic and CD-authoring workflows at full studio fidelity. That fidelity comes at a price of roughly 10MB per stereo minute, so a handful of bounced tracks can fill a folder and refuse to fit through email or a chat upload. Encoding to MP3 is the first and only lossy step, and it collapses the size by around 90% while keeping quality that holds up well for sharing demos, references and rough mixes. Master and archive in AIFF; hand out MP3.
What is AIFF?
AIFF is Apple's uncompressed audio format, the Mac counterpart to WAV: studio-quality, lossless, and large, common in GarageBand and Logic exports. The full fidelity is overkill for sharing, where an MP3 is a fraction of the size. Converting keeps the sound and drops the bulk.
What is MP3?
MP3 is the audio format that ate the world in the late 1990s, and it remains the most universally supported way to store sound: lossy compression at roughly a tenth of CD size, playable on literally anything with a speaker. Newer codecs like AAC and Opus beat it on quality per kilobyte, but no format comes close to its compatibility across car stereos, ancient MP3 players, browsers, editing software and upload forms.
Quality and what to expect
This is the single lossy step in an otherwise bit-perfect chain: the AIFF held raw PCM, and the MP3 is produced by LAME at a high variable bitrate (around 190 kbps), which is transparent to most listeners on normal playback but is genuinely lossy and not reversible. Because the source was uncompressed, the size drop is dramatic, typically about 85 to 92 percent. Sample rate and channels are preserved, and a mono export stays mono and halves again. Keep the AIFF as your master for any future editing or mastering, since re-encoding the MP3 down the line would compound the loss.
AIFF to MP3 FAQ
How much smaller will the MP3 be than the AIFF?
Usually around 85 to 92 percent smaller, because the AIFF was uncompressed to begin with. A 5-minute stereo bounce of roughly 50MB lands near 5MB as an MP3, which is finally easy to send.
Will I hear the difference after converting?
For most listeners on normal gear, no. The encode runs at a high bitrate that is transparent for typical material, though it is still a lossy step, so trained ears on a good monitoring setup may notice on demanding mixes.
Does my session export leave my computer?
No. The AIFF is decoded and the MP3 encoded by WebAssembly running in your browser tab; nothing about your unreleased track is transmitted, and you can confirm it in the network panel.
Should I keep the AIFF after converting?
Yes, treat the AIFF as the master. It is lossless, so any future re-edit or remaster should start from it rather than from the MP3, which has already taken its one generation of loss.