Share your secret with a cryptographically secure method. All running locally in your browser. Your secrets never leave your machine!
The following youtube videos explain you more about Shamir's Secret Sharing
With Simple Shamir's Secret Sharing (s4) I want to provide you an easy to use interface for this beautiful little piece of math.
s4 is open source and provided as it is. You can find the code on Github and this website works completely offline. Save it to your computer (Ctrl+S) in order to not lose access to the s4 in case this website will be down at any point in the future.