BIP39 Passphrase Generator
NewGenerate BIP39 mnemonic seed phrases (12–24 words) for cryptocurrency wallets.
Word indices
Uses secure random entropy from crypto.getRandomValues(). This tool generates and validates phrases only — it does not derive wallet keys.
Validation panel
Frequently Asked Questions
Which mnemonic lengths does this tool support?
It supports the standard BIP39 word counts only: 12, 15, 18, 21, or 24 words. Those map to 128 through 256 bits of entropy plus checksum bits.
Why does it say my phrase is invalid even though every word is in the BIP39 list?
Because BIP39 validation is not just a wordlist check. This tool rebuilds the 11-bit indices, recomputes the checksum, and rejects phrases whose checksum bits do not match.
Does this derive a wallet seed, xpub, or private keys too?
No. It only generates and validates mnemonic phrases. The component explicitly says it does not derive wallet keys.
Is this using the English BIP39 list only?
Yes. The bundled wordlist is the English 2048-word BIP39 list, and validation flags any word that is not in that list.
Do capitalization and extra spaces matter when I validate a phrase?
Not much. The validator normalizes input with NFKD, trims it, lowercases it, and splits on whitespace before checking the words and checksum.