Bip39 Standalone Html Download. Though it works by using BIP32 process you may still import BIP39 seeds into Electrum wallet. Also aside from BIp32 You can find BIP44 Variation which some wallet use for that technology of seeds. Just after entry, double check you will be entering your desired passphrase. https://finance-uk47036.vigilwiki.com/6518896/the_anatomy_of_the_bip39_phrase_entropy_text_and_stability