Convert M4B to AIFF — Free Online Converter

Converting M4B audiobooks to AIFF decodes the compressed AAC audio (typically 32-64 kbps for spoken word) and stores it as uncompressed PCM in Apple's AIFF format. This conversion is useful for editing audiobook audio in professional DAWs, creating sound installations from book recordings, or importing spoken content into music production projects where uncompressed format is required.

DAWs like Logic Pro, Pro Tools, and GarageBand work most efficiently with uncompressed AIFF for editing. If you need to edit audiobook narration — trim silences, adjust levels, add music beds, or create spoken-word samples — converting to AIFF provides the optimal editing format on macOS. AIFF also avoids any re-encoding when exporting segments back to compressed formats.