Websites that ask you to upload your encoded .inc or .php file. These services simply steal your encrypted code and attempt to sell it to competitors. Never upload proprietary code to unknown online decoders.
IonCube v12 introduced a key derivation function that mixes the license data, domain name, and a timestamp nonce. The Decoder 12 update (version 12.0.5, unofficial) reportedly uses a symbolic execution engine to model the KDF without needing the original license. This reduces the decryption time from hours to seconds for most encoded files. ioncube decoder 12 upd
Instead of chasing an impossible tool, consider these legitimate approaches: Ioncube Decoder 12 UPD: The Ultimate Guide to