Audio Conversion
Convert MP3 to M4B Online — Free
Fast, free MP3 to M4B converter. No registration required.
或从以下导入
200万+文件已转换
数千用户的信赖之选
安全传输
HTTPS 加密上传
隐私优先
文件处理后自动删除
无需注册
即刻开始转换
随处可用
任何浏览器，任何设备
如何转换
1
Upload your .mp3 file by dragging it into the upload area or clicking to browse.
2
Choose your output settings. The default settings work great for most files.
3
Click Convert and download your .m4b file when it's ready.
什么是 MP3？
MP3 is the most popular audio format worldwide. It uses lossy compression to reduce file size while maintaining acceptable audio quality for most listeners.
格式详情
- 全称
- MPEG Audio Layer III
- 扩展名
- .mp3
主要特点
- Universal compatibility
- Small file sizes
- Streaming support
- ID3 tag support
什么是 M4B？
M4B is the MPEG-4 audiobook format used by Apple iTunes and many audiobook platforms. It supports chapter markers, bookmarking, and AAC compression for efficient audiobook delivery.
格式详情
- 全称
- MPEG-4 Audiobook
- 扩展名
- .m4b
主要特点
- Chapter support
- Bookmark resume
- iTunes compatible
- AAC compression
MP3 与 M4B 对比
| 特性 | MP3 | M4B |
|---|---|---|
| 全称 | MPEG Audio Layer III | MPEG-4 Audiobook |
| 扩展名 | .mp3 | .m4b |
| 最适合 | Universal compatibility | Chapter support |
常见问题
Converting between lossless formats preserves perfect quality. When converting to lossy formats, our optimized encoding minimizes any audible difference. You can adjust bitrate to control quality vs. file size.
We preserve ID3 tags, album art, and metadata when both MP3 and M4B support them. Some metadata may not transfer between incompatible formats.
Pro users can batch convert multiple audio files simultaneously. Free users convert one file at a time with up to 5 free conversions per day.
We support all standard sample rates from 8kHz (voice) up to 192kHz (studio quality). The default preserves your source file's sample rate.
Yes. Our audio converter handles music, podcasts, voice memos, and audiobook files. For podcasts, we recommend MP3 at 128-192kbps for the best balance of quality and file size.