Most major platforms that support self publish audiobooks accept files in MP3 or WAV format. The audio should be clear, consistent, and recorded in high-quality sound (usually 192 kbps or higher). Each chapter or section is usually saved as a separate file with proper titles.
Before uploading, it’s important to check that the audio meets platform standards for volume, noise level, and file size. Following these simple format rules helps your audiobook play smoothly and sound professional on every platform.