bip39-tool

BIP39 mnemonic generator + validator + seed deriver. Runs entirely in your browser — entropy comes from crypto.getRandomValues, PBKDF2 from SubtleCrypto. Nothing leaves the page.

⚠️ Don't paste a real wallet's mnemonic into any web tool, including this one. Verify the source code, or download and run it offline.

Generate

Entropy Wordlist

Mnemonic Entropy (hex)

Validate & derive seed

Wordlist Passphrase (optional, BIP39 §"the 25th word")

Mnemonic (12 / 15 / 18 / 21 / 24 words, separated by spaces)

Entropy (hex, recovered from mnemonic) Seed (hex, 64 bytes — PBKDF2-HMAC-SHA512, 2048 iterations)