Prepare Audiobook Files for ACX & Audible Compliance

Audible (ACX) requires specific audio parameters for narration files. Convert master WAV chapters to constant bitrate (CBR) MP3 files encoding at 192kbps or higher. Attach cover art, chapter titles, narrator names, and copyright dates locally in your browser before uploading to ACX.

FAQ

What are ACX MP3 requirements?

ACX requires files to be 192kbps or higher MP3s at 44.1kHz sample rate, saved as Constant Bitrate (CBR). Our encoder formats files to these exact parameters.