Bip39 Tool. Due to the cryptographic layout of BIP-39, a weak passphrase doesn't reduce the protection of the other wallets or help expose the seed words. Certainly, BIP39 passphrases are case-sensitive. Make sure to enter your passphrase exactly when you set it up, such as any uppercase or lowercase letters. https://ez-bookmarking.com/story19484979/bip39-wallets-https-linktr-ee-bip39-a-review-of-bip39-generator