NCM is decrypted in your browser, then encoded to patent-free OGG. Decryption is local and private; pick a bitrate to balance size and quality.
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 OGG
Open royalty-free lossy format
OGG (typically Ogg Vorbis or Ogg Opus) is a free, open audio container that usually outperforms MP3 at the same bitrate, ideal for license-sensitive use.
- Free and open, no patent restrictions
- Better than MP3 at equal bitrate
- Compatibility varies on some mainstream players
NCM to OGG FAQ
Will converting NCM to OGG lose quality?
Both NCM and OGG are lossy formats. Re-compression may further reduce quality — choose a higher bitrate to minimize additional loss.
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 OGG?
Just drop multiple NCM files in; they are converted to OGG one by one via a queue. You can download them individually or as a single ZIP.