Convert AIFF to MP3, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your AIFF file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert AIFF to MP3
AIFF (Audio Interchange File Format) was developed by Apple in the late 1980s as a lossless audio container, and files can easily reach 50 MB or more for a single song. Converting to MP3 shrinks that dramatically, typically to 4 to 10 MB, without audible degradation at standard bitrates. The conversion runs entirely in your browser using WebAssembly, so your audio file is never uploaded to a server and nothing is stored on our end.
The browser-side processing means there is no file size cap imposed by a server upload limit. Whether you have a 200 MB orchestral recording or a short podcast clip, the converter handles it locally. MP3 at 192 kbps is the standard for general listening and streaming platform uploads; 320 kbps suits archiving where file size is less of a concern.
Select your AIFF file
Click the upload area and choose your .aiff or .aif file. Because conversion runs in your browser, the file never leaves your device.
Choose output bitrate
Pick a bitrate from the options (128, 192, or 320 kbps). 192 kbps is a solid default for music; 128 kbps suits voice recordings and podcasts.
Start the conversion
Click Convert. The WebAssembly audio engine processes the file on your machine. Progress is shown in real time.
Download the MP3
When processing completes, click Download to save the MP3 to your device. Check the file size reduction in your file manager.
Frequently asked questions
Does AIFF to MP3 conversion affect sound quality?
AIFF is lossless; MP3 is lossy. At 192 kbps or higher, most listeners cannot distinguish the MP3 from the original in a blind test, but the conversion is technically irreversible. Keep your AIFF originals if you may need to remaster or edit later.
Is my audio file uploaded to a server?
No. The converter uses WebAssembly compiled from the FFmpeg audio library and runs entirely in your browser. Your file is processed in local memory and never leaves your device.
What is the maximum AIFF file size this tool handles?
Because processing is local, there is no server-imposed size limit. Practical limits depend on your device's available RAM. Most desktop browsers handle files up to 2 GB without issue.
What bitrate should I use for music streaming platforms?
Spotify, Apple Music, and similar platforms re-encode uploads anyway, so any bitrate 192 kbps or higher is fine as a source file. For archival copies you intend to store, 320 kbps is the MP3 maximum.
Can I convert multiple AIFF files at once?
The batch capability depends on the tool's current version. For large batches, processing files one at a time ensures each conversion completes fully before moving to the next.
What is the difference between AIFF and AIFF-C?
AIFF is always uncompressed PCM audio. AIFF-C (also called AIFC) can contain compressed audio using various codecs. Both formats use the .aiff or .aif extension, and both convert to MP3 using the same process.