Some online tools (written by me) that work by processing data in your browser, nothing gets uploaded to a remote server.
Identify the WannaCry variant based on the SHA256 hash of the file.
A small utility I’m using to play with the WannaCry-encrypted files. It’s not decrypting the files, unless you have the private key.
Generate different hashes (MD5, SHA1, SHA256, SHA512, SHA3) based on the binary contents of the specified file.
There are one billion online base64 converters, but here is one more.