NCM is decrypted locally first, then saved as FLAC. If the underlying audio is lossless, you keep it lossless in a compact, archive-friendly file.
About NCM
NetEase Cloud Music encrypted format
NCM is the encrypted cache format used by NetEase Cloud Music and cannot be played directly. This tool decrypts it in your browser and restores it to MP3 or FLAC.
- Auto-decrypts to common formats
- Encrypted, must be decrypted first
About FLAC
Lossless compressed format
FLAC uses lossless compression, cutting file size roughly in half while keeping the original audio quality. It is widely used by audiophiles and for archiving.
- Lossless, identical to the source
- Much smaller than WAV
- Some older players lack support
NCM to FLAC FAQ
Will converting NCM to FLAC lose quality?
NCM is already a lossy format, so converting to lossless FLAC introduces no additional quality loss — existing compression artifacts remain but nothing new is degraded.
Will the file size change after conversion?
Converting to a lossless format (WAV) usually increases size, while converting to a lossy format (MP3, AAC) usually decreases it, depending on the chosen bitrate and sample rate.
How do I batch convert NCM to FLAC?
Just drop multiple NCM files in; they are converted to FLAC one by one via a queue. You can download them individually or as a single ZIP.