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MP3 to M4B Converter
Convert MP3 to M4B online — free and unlimited. No sign-up, no watermarks, no monthly limits. Adjustable bitrate up to 320 kbps. Files deleted after 1 hour. Powered by FFmpeg.
Upload your MP3 file
Drag & drop or click to browse · Max 500 MB
How to convert MP3 to M4B
Upload your file
Drag & drop or click to browse. Supports files up to 500 MB.
Choose quality (optional)
Pick your bitrate — 192 kbps is ideal for music, 128 kbps for voice.
Download instantly
Click Convert, wait a few seconds, then download your file — free.
Frequently Asked Questions
Is MP3 to M4B conversion free?
Yes — 100% free with no monthly limits, no file count restrictions, and no watermarks. Convert as many MP3 files to M4B as you need.
Do I need to create an account to convert MP3 to M4B?
No account required. Just upload your file, click Convert, and download. That's it.
What is the maximum file size for MP3 to M4B conversion?
Files up to 500 MB are supported. This covers the vast majority of Audio files.
How long does MP3 to M4B conversion take?
Most conversions complete in 5–30 seconds. Larger files may take slightly longer.
Are my MP3 files kept private?
Yes. All uploaded files are permanently deleted from our servers within 1 hour. We never access or share your content.