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M4B is similar to M4A but tailored for audiobooks and podcasts. It supports bookmarking, allowing listeners to resume playback from where they left off. M4B files are often used by iTunes and Apple Books for spoken-word content.
AAC stands for Advanced Audio Coding and is a lossy audio format known for its high sound quality at lower bitrates. It’s commonly used by streaming platforms and devices like iTunes, YouTube, and iPhones. Compared to MP3, AAC offers better audio performance at similar file sizes.
Convert your .m4b files to .aac right in your browser — no downloads, no installs. Everything happens securely in the cloud.
We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.
Turn your M4B files into AAC in just a couple of clicks. No registration, no limits — and it’s 100% free.