Bip39 Passphrase Generator. Before everything you need to keep it SEPARATELY out of your seed. Obtaining your seed and your passphrase in a similar site defeats the goal of aquiring a passphrase to begin with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. https://bookmark-master.com/story19575378/bip39-passphrase-https-linktr-ee-bip39-bip39-words-fundamentals-explained