MP3 to M4B Converter
Convert MP3 audio files to M4B audiobook format. Create audiobooks compatible with Apple Books and iTunes.
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MP3 Conversion - Convert MP3 to:
Select a format to convert your MP3 file to:
Advanced Conversion Options
Customize your conversion with these advanced options to get the perfect output for your needs.
Bitrate
Audio bitrate (higher = better quality, larger file)
Available Options:
💡 Recommendation:
Use 192kbps for general listening, 320kbps for high-quality music, or 128kbps for voice/podcasts.
Quality (VBR)
Variable bitrate quality for MP3/OGG (0=best, 9=smallest)
Range: 0 to 9 (step: 1)
Default: 2
Sample Rate
Audio sample rate in Hz
Available Options:
💡 Recommendation:
Stick with 44.1kHz for most music, use 48kHz for video soundtracks.
Channels
Audio channel configuration
Available Options:
Normalize Volume
Automatically adjust audio levels
Default: Disabled
💡 Recommendation:
Enable for consistent volume across multiple audio files.
How to Use Advanced Options
When using our converter, you can access advanced options by expanding the "Options" section before starting the conversion. These settings allow you to fine-tune the output quality, file size, and compatibility to match your specific needs.
MP3 to M4B Converter Pricing
Choose a plan that fits your conversion needs
Basic
- 20 conversions per day
- 500MB file size limit
- 5GB storage cap
- Files stored for 24 hours
- API access (5 req/day)
Bronze
- 50 conversions per day
- 2GB file size limit
- 150GB storage cap
- Files stored for 7 days
- API access (200 req/day)
- Cloud import (Google Drive, Dropbox)
Silver
- 100 conversions per day
- 5GB file size limit
- 250GB storage cap
- Files stored for 15 days
- Full API access (400 req/day)
- Priority queue processing
Gold
- Unlimited conversions
- 10GB file size limit
- 650GB storage cap
- Files stored for 30 days
- Unlimited API access
- Highest queue priority
Frequently Asked Questions
Common questions about MP3 to M4B conversion
Still have questions about our MP3 to M4B converter?
Contact SupportSecure MP3 to M4B Conversion
Your files are protected with enterprise-grade security
Antivirus Scanning
Every uploaded file is scanned with ClamAV antivirus before processing. Malicious files are automatically rejected to protect our systems and other users.
End-to-End Encryption
All file transfers use TLS 1.3 encryption. Files are encrypted at rest using AES-256 encryption in our secure cloud storage.
Automatic Deletion
Files are automatically deleted after your retention period expires (6 hours to 30 days depending on plan). You can also manually delete files anytime.
Data Anonymization
Non-member conversions use anonymous fingerprints. We never sell or share your data. Metadata is stripped from files during conversion.
GDPR Compliant
Full compliance with GDPR and international data protection regulations. Request data export or deletion anytime from your account settings.
Secure Infrastructure
Hosted on enterprise-grade infrastructure with DDoS protection, WAF, and 24/7 monitoring. Regular security audits and penetration testing.
MP3 to M4B Conversion API
Integrate file conversion into your applications with our powerful API
RESTful API
Simple, intuitive REST API with JSON responses. Convert files programmatically with just a few lines of code.
API Key Authentication
Secure API key authentication with support for multiple keys. Rotate keys without downtime.
Webhook Notifications
Receive real-time notifications when conversions complete. Configure custom endpoints and retry logic.
Batch Processing
Convert multiple files in a single API call. Track batch progress with detailed status updates.
Async Processing
Submit conversions and poll for status, or use webhooks for notification. Handle large files efficiently.
SDKs & Documentation
Comprehensive API docs with examples in Python, Node.js, and cURL. Interactive API explorer available.
// Convert a file using the API
const response = await fetch('https://converteverything.io/api/v1/convert', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'multipart/form-data'
},
body: formData // { file, output_format: 'pdf' }
});
const { conversion_id, status } = await response.json();All Supported Formats
ConvertEverything supports conversion between all these file types
98 formats•1,108 possible conversions
Audio
16 formats
High-quality audio conversion with customizable bitrate and sample rate
Video
15 formats
Professional video transcoding with codec selection and resolution control
Image
16 formats
Lossless and lossy image conversion with quality optimization
Camera RAW
7 formats
Convert camera RAW files from Canon, Nikon, Sony, Fuji, and more
Document
15 formats
Convert Word, Excel, PowerPoint, and PDF with preserved formatting
Ebook
5 formats
Convert between all major ebook formats for any e-reader device
Data
6 formats
Convert structured data between JSON, CSV, XML, and more
3D Models
7 formats
Professional 3D model conversion for design and manufacturing
Fonts
5 formats
Convert fonts for web and desktop use with perfect compatibility
Archives
5 formats
Extract and convert compressed archive files
CAD
1 formats
Convert CAD drawings to PDF, SVG, and raster formats
Related Conversions
Check out these other popular audio converters
Convert Files with AI Assistants
Use our MCP server to convert MP3 to M4B directly from Claude, Cursor, and other AI assistants
AI-Native Integration
Built for the Model Context Protocol (MCP). Works seamlessly with Claude, Cursor, and other AI assistants.
Natural Language
Just ask your AI to convert files. No complex commands needed - the MCP handles everything automatically.
Local File Access
Convert files directly from your local filesystem. The AI can read, convert, and save files for you.
Batch Operations
Convert entire folders of files with a single request. Perfect for bulk format migrations.
Fast Processing
Leverages the full ConvertEverything infrastructure. Same speed and quality as our web interface.
API Key Auth
Uses your ConvertEverything API key. All conversions count toward your plan limits.
// Add to your claude_desktop_config.json
{
"mcpServers": {
"converteverything": {
"command": "npx",
"args": ["-y", "@anthropic/mcp-converteverything"],
"env": {
"CONVERTEVERYTHING_API_KEY": "your_api_key"
}
}
}
}Convert MP3 to M4B audiobook format online free. Create audiobooks for Apple Books.
Start Converting MP3 to M4B Today
Fast, free, and secure MP3 to M4B conversion. No registration required.
Want even more? Upgrade for larger file sizes, faster processing, and batch conversion.
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