Convert AAC to M4B

Convert AAC files to M4B format online for free. No upload required, 100% private.

Upload File

Drag and drop audio files here, or click to select

🔒 Your files are processed locally in your browser. Nothing is uploaded to our servers.

AACM4BRe-encoding

Converting between two lossy formats (AAC → M4B) involves re-encoding, which may cause additional quality loss. For best results, convert from the original source file when possible.

About AAC

AAC

Advanced Audio Coding

AAC is a lossy audio codec designed as the successor to MP3. It provides better sound quality at similar bitrates and is widely used in streaming services.

Extension

.aac

Developed By

ISO/IEC

Released

1997

Compression

Lossy

Typical Use Cases

YouTubeStreaming servicesDigital broadcastingMobile devices

Pros

• Better quality than MP3
• Efficient compression
• Wide platform support

Cons

• Patent encumbered
• Less universal than MP3
• Variable encoder quality

About M4B

M4B

MPEG-4 Audiobook

M4B is an audiobook format based on MPEG-4. It supports chapters, bookmarks, and is the standard format for iTunes and Audible audiobooks.

Extension

.m4b