Bulk MP3 to M4A Converter Online — Free HD Quality
Drag and drop your multiple MP3 files into this 100% free online MP3 to M4A converter (.mp3 to .m4a), and click the Convert button to bulk convert them to M4A format in HD quality. Use the quality slider to fine-tune your M4A output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original MP3 files are removed from our servers right after. Also see:Process multiple MP3 to ALAC files.
Drop your MP3 files here to convert to M4A, or click to browse
Converts .mp3 to M4A (.m4a) in HD quality — bulk, free, no signup
Choose FilesMP3 vs M4A — File Format Comparison
See how MP3 and M4A compare across file extension, MIME type, compression, and feature support.
| Feature | MP3 | M4A |
|---|---|---|
| File Extension | .mp3 | .m4a |
| MIME Type | audio/mpeg | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
What Is MP3 Format?
MPEG-1 Audio Layer III — the world's most popular compressed audio format, balancing sound quality with small file sizes for music streaming, downloads, and portable devices.
- Compression: Lossy
- Tags & Metadata: Supported
What Is M4A Format?
MPEG-4 Audio — AAC audio in an MP4 container, the standard format for Apple Music, iTunes purchases, and iPhone voice memos, offering better quality than MP3 at equivalent bitrates.
- Compression: Lossy
- Tags & Metadata: Supported