Convert MKV to AIFF — Free Online Converter

AIFF (Audio Interchange File Format) is Apple's uncompressed audio standard, used extensively in professional music production on macOS. Converting MKV to AIFF extracts the audio track and stores it as raw PCM data, preserving every sample without any lossy compression artifacts.

Professional audio engineers working in Logic Pro, GarageBand, or Pro Tools on macOS often require uncompressed audio for mixing and mastering. AIFF provides bit-identical PCM audio wrapped in a metadata-rich container that integrates seamlessly with Apple's professional audio ecosystem, including loop markers, instrument data, and comments fields that WAV does not support.

When extracting audio from MKV video recordings of live performances, studio sessions, or field recordings, converting to AIFF ensures zero quality loss regardless of the source codec. Even if the MKV contains lossy audio (AAC, Opus), the AIFF output preserves that quality ceiling without introducing additional compression artifacts that a second lossy encoding would cause.

FFmpeg decodes whatever audio codec the MKV contains and outputs raw PCM samples in big-endian format (the AIFF standard). Sample rates are preserved from the source, typically 44.1 kHz or 48 kHz, with bit depths up to 24-bit or 32-bit float depending on the source. If the MKV has surround audio (5.1 or 7.1), all channels are preserved in the AIFF output unless downmixing is explicitly requested.