NCM is decrypted locally and converted to an M4R ringtone trimmed near 40 seconds, ready to import into iPhone. Decryption and conversion both happen privately in-browser.
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 M4R
iPhone ringtone format
M4R is the ringtone format used by iPhone, essentially AAC audio limited to around 40 seconds, suited for creating custom ringtones.
- Usable directly as an iPhone ringtone
- Length-limited and single-purpose
NCM to M4R FAQ
Will converting NCM to M4R lose quality?
Both NCM and M4R 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 M4R?
Just drop multiple NCM files in; they are converted to M4R one by one via a queue. You can download them individually or as a single ZIP.