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AIFFMP3

Convert AIFF to MP3

This free AIFF to MP3 converter changes your Audio Interchange File Format (.aiff) file into a MPEG-1 Audio Layer III (.mp3) file, right in your browser. There is nothing to install, no account to create, and no limit on how many files you convert.

100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

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The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. MP3 is best for universal music and podcast playback, which is the usual reason to convert from AIFF.

Why convert AIFF to MP3?

  • MP3 plays on more devices and apps than AIFF, so it is the safer choice for sharing.
  • Compressing AIFF to MP3 makes files much smaller, discarding detail your ears rarely notice.
  • Pick MP3 when you need a file made for universal music and podcast playback.

AIFF vs MP3

PropertyAIFFMP3
Full nameAudio Interchange File FormatMPEG-1 Audio Layer III
ContainerAIFFMP3
Typical codecPCMMP3
CompatibilityModern playersUniversal
LosslessYesNo
Best forLossless audio on Apple devicesUniversal music and podcast playback

How to convert AIFF to MP3

  1. Add your AIFF file

    Drag and drop your .aiff file onto the upload area, or click to browse and pick it from your device.

  2. Start the conversion

    Click "Convert to MP3". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.

  3. Wait a few seconds

    A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.

  4. Download your MP3 file

    When it finishes, download the .mp3 file straight to your device.

Frequently asked questions

Is this AIFF to MP3 converter free?
Yes. It is completely free with no signup, no watermark, and no limit on how many files you convert. It is supported by ads, which keeps the conversion itself free.
Are my files uploaded to a server?
No. The conversion runs locally in your browser using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is processed in memory on your own device and is never uploaded, stored, or seen by anyone.
Will I lose quality converting AIFF to MP3?
The audio is re-encoded to MP3, which is lossy. At a sensible bitrate the difference is hard to hear, but converting back and forth repeatedly will degrade quality.
Will the file get smaller or larger?
Much smaller. MP3 is compressed, so converting from lossless AIFF usually cuts the size by more than half.
What is the difference between AIFF and MP3?
AIFF is Audio Interchange File Format (an AIFF container, typically PCM); MP3 is MPEG-1 Audio Layer III (an MP3 container, typically MP3). MP3 is best for universal music and podcast playback, while AIFF is best for lossless audio on Apple devices.
How long does the conversion take?
Most files finish in a few seconds to under a minute, depending on length and your device. The first conversion is a little slower while the engine downloads and caches, then later runs start instantly.

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Need more formats or options? Use the full Audio Converter.