Bip39 validator https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure Though it uses BIP32 strategy you may however import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 Edition which some wallet use to the era of seeds. It is really straightforward — if you don't be concerned about copyright inheritance, nobody else... https://collinmmss433.lucialpiazzale.com/from-concept-to-fact-generating-bitcoin-addresses-with-bip39