Paste-first
Crypto
ready
BIP39 Passphrase Generator
Generate and validate BIP39 mnemonic phrases locally, then derive a seed with an optional passphrase.
Algorithm
BIP39 / PBKDF2-HMAC-SHA512
Data
Wallet material stays local
Output
Seed hidden until reveal
High sensitivity
What BIP39 Passphrase Generator does
local-first
BIP39 Passphrase Generator creates English BIP39 mnemonic recovery phrases locally in the browser, validates pasted seed phrases, and derives the 512-bit BIP39 seed from a mnemonic plus optional passphrase. Choose 12, 15, 18, 21, or 24 words, copy the mnemonic, and reveal seed hex only when needed; no wallet phrase is sent to a server.