For splitting a large VCF file, you can opt for the method that best suits you, like the manual method, online tools, or trusted software. In my opinion, you can s
plit your VCF files with the professional application because the manual as well as online tools can cause the circumstance of data loss. I suggest using the
GainTools Address Book Manager Software; you can split the VCF files without any restrictions. You can try the free trial edition of this app to explore its workings and its capabilities.