Technologies which are used for bypassing the Great Firewall of China are costly and require effective obfuscation. Unfortunately, there is no 100% effective free VPN for China.
It is completely free but runs on Android only.
NordVPN: Perfect VPN to unblock restricted websites and protect your connection from malicious websites in China.Surfshark: The number one VPN to use in China because of effective obfuscation, reliable Netflix support, and low price.