A secure calculator is one that works without the need for an Internet connection.
You can only be sure that nobody will get your results when the computer you work on is not connected to the Internet.
To keep your seed 100% secure, you should carefully read
THE SAFETY RULES before you act.
No matter if you execute your own code, or use any third party software like the one offered here!
If you cannot calculate the last checksum word yourself but still care deeply about security, you can purchase an offline tool
licensed by ledgernano.tips
The tool provided here is a command-line (CLI) application, thoroughly tested on both Windows and Linux.
It securely calculates the final 24th checksum word for any standard BIP39 recovery phrase. Under the hood, it implements the exact same reliable algorithm that powers the online calculator on this website.
To order the application, please contact us at:
