AIFF to MP3 Converter – Free Online

How to Convert AIFF to MP3 Online

Upload your AIFF file

Drag and drop your .aiff file onto the page or click to browse. You can select several AIFF files at once to batch-convert them.

MP3 is preselected

The output format is already set to MP3, so you can convert immediately. If you need to, adjust the audio codec, bitrate or sample rate in the settings panel first.

Convert and download

Click Convert. The MP3 file is processed on your own device; nothing is uploaded to a server. When it finishes, click Download to save it (or Download all to get a batch as a ZIP).

Why Convert AIFF to MP3?

AIFF is Apple's uncompressed format and the default export of many Mac audio apps, but it is huge and rarely plays on Windows or Android. Converting AIFF to MP3 shrinks a session bounce by up to 90% and makes it playable on every device.

The converter reads the AIFF in your browser, keeps the sample rate and channels, and encodes MP3 at the bitrate you choose, so demo mixes never have to be uploaded to a third party.

Private by design: your AIFF file is converted on your own device and never uploaded.
MP3 preselected: the output format is already chosen, so it is a one-click conversion.
Batch friendly: convert several AIFF files in one go and download them as a ZIP.
No limits, no watermark: free for files of any size, with nothing stamped on the output.

AIFF vs MP3

AIFF (Audio Interchange File Format): AIFF is Apple's uncompressed audio format, the macOS equivalent of WAV. It is used by Logic Pro, GarageBand and professional mastering houses. It is best for Logic Pro, GarageBand and Mac audio production.

MP3 (MPEG-1 Audio Layer III): MP3 is the universal lossy audio format. It plays on every device made in the last twenty-five years and offers small files with good quality at 192 to 320 kbps. It is best for music players, podcasts, phones and sharing.

In short: keep AIFF when the priority is Logic Pro, GarageBand and Mac audio production, and switch to MP3 when the file is headed for music players, podcasts, phones and sharing. Need a different target? The full Audio Converter supports every format listed below.

AIFF to MP3 FAQ

What bitrate should I choose for a music demo?

320 kbps keeps the mix transparent for reviewers; 192 kbps is fine for reference listening on phones.

Are AIFF tags preserved?

AIFF ID3 tags are read when present, and you can edit title, artist and album in the metadata box before converting.

Is this AIFF to MP3 converter free?

Yes. Converting AIFF to MP3 on MediaConverter.io is completely free, with no watermark, no sign-up and no daily conversion limit.

Are my AIFF files uploaded to a server?

No. The converter runs inside your browser using WebAssembly and WebCodecs, so your .aiff file is read and converted on your own device. Nothing is uploaded, which keeps private recordings private and means there is no waiting in an upload queue.

Is there a file size limit for AIFF to MP3?

No fixed limit. Because processing happens locally, the practical limit is your computer's memory and patience; multi-gigabyte AIFF files convert fine on a desktop browser. Very large files take longer on phones.

Will converting AIFF to MP3 reduce quality?

MP3 is a lossy format, so the AIFF audio is decoded and re-encoded. Keep the bitrate at 100% (or pick 256 to 320 kbps) and the difference is inaudible for almost all listeners.

Which browsers support the AIFF to MP3 converter?

Current versions of Chrome, Edge, Firefox and Safari on desktop all work. Chrome and Edge are fastest because they expose hardware-accelerated WebCodecs decoders.