AIFF to MP3 Converter

AIFF comes from Apple studio tools and stores big-endian PCM, so expect unusually large files and metadata written by Pro Tools or Logic. Audio Interchange File Format (AIFF) is a uncompressed audio format used for apple production workflows, sample libraries and studio interchange. Files saved as AIFF usually come from Apple. Before converting, check that the source is the highest-quality copy you have, because every later step can only preserve what is already there.

The target is MPEG-1 Audio Layer III (MP3), a lossy audio format chosen for broad compatibility for music. The target uses perceptual lossy compression, which is efficient for playback but discards inaudible detail the encoder considers expendable. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

MP3 uses libmp3lame here, with VBR quality around 128–320 kbps. Every player and car stereo reads it, but the format adds encoder delay, so tight loops can start with a few milliseconds of silence. Channel layout is preserved, so a stereo source stays stereo and a mono recording is not upmixed. The sample rate is preserved unless you change it; resampling would add another processing step and is best avoided. Expect a smaller output file, which is usually the reason to pick MP3.

This conversion runs locally in your browser tab through Canvas or FFmpeg.wasm. The file is read from your device, decoded, re-encoded and handed back as a download; it is not uploaded to a conversion server. That keeps private recordings, client material and unreleased artwork off shared infrastructure.

After the download, play or open the result before deleting the original. Check the first and last seconds, confirm that transparency, rotation metadata or sample rate survived, and compare file sizes. If something looks wrong, retry with a higher quality setting rather than converting the output again.