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Bulk M4B to AVIF Converter Online — Free HD Quality

Drag and drop your multiple M4B files into this free online M4B to AVIF converter (.m4b to .avif), and click the Convert button to bulk convert them to AVIF format in HD quality. Use the quality slider to fine-tune your AVIF output, then download your converted files one by one or as a single ZIP — your original M4B files are removed from our servers right after.

To:
85%

Drop images here or click to browse

PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more

Max 100MB per file

M4B vs AVIF — File Format Comparison

Feature M4B AVIF
File Extension .m4b .avif
MIME Type audio/mp4 image/avif
Compression Type Lossy Lossy & Lossless
Metadata Support Yes Yes

What Is M4B Format?

MPEG-4 Audiobook — AAC audio in an MP4 container with bookmarking support, the standard format for audiobooks on Apple Books, Audible exports, and iPhone podcasts.

  • Compression: Lossy
  • Tags & Metadata: Supported

What Is AVIF Format?

AV1 Image File Format with superior compression for modern browsers.

  • Compression: Lossy & Lossless
  • Tags & Metadata: Supported

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