Bulk MP3 to FLAC Converter Online — Free HD Quality
Drag and drop your multiple MP3 files into this 100% free online MP3 to FLAC converter (.mp3 to .flac), and click the Convert button to bulk convert them to FLAC format in HD quality. Use the quality slider to fine-tune your FLAC 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:Best AC3 to WAV converter online.
Drop your MP3 files here to convert to FLAC, or click to browse
Converts .mp3 to FLAC (.flac) in HD quality — bulk, free, no signup
Choose FilesMP3 vs FLAC — File Format Comparison
See how MP3 and FLAC compare across file extension, MIME type, compression, and feature support.
| Feature | MP3 | FLAC |
|---|---|---|
| File Extension | .mp3 | .flac |
| MIME Type | audio/mpeg | audio/flac |
| Compression Type | Lossy | Lossless |
| 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 FLAC Format?
Free Lossless Audio Codec — open-source lossless compression that reduces file size by 40–60% versus WAV with zero quality loss, perfect for audiophile archiving.
- Compression: Lossless
- Tags & Metadata: Supported