AIFF to FLAC 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 Free Lossless Audio Codec (FLAC), a lossless audio format chosen for archiving music without sacrificing cd-quality data. The target stores samples without perceptual loss, so the file grows considerably; it preserves the current quality but cannot recover earlier compression. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

FLAC stores the decoded samples losslessly, typically at 50–60% of the WAV size. It is the archival choice when the source is already lossless. 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 larger output file: the format trades size for lossless fidelity.

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.