It's a great site. .. I used it to divide passwords for the encrypted file that contains the private keys for my bitcoin and divided it among family members. . . if they die they can still recover my (smallish) horde.
I've read about Shamir's Secret Sharing before, but never actually tried it. This tool makes it super easy to use. Might be a good idea to save it offline and make sure it works in the browser and then use it to avoid any sort of malicious code.
You can use it offline and it's totally secure because you can study the source code..
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