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Mnemonic Phrase Generator

Generate cryptographically secure BIP39 mnemonic phrases (12, 15, 18, 21, or 24 words). Recovery words for crypto wallets. Runs locally.

Word count
Word count

Reference

What is BIP39?

BIP39 is a standard for generating human-readable backups of cryptocurrency private keys. A 12-word phrase represents 128 bits of entropy; a 24-word phrase represents 256 bits. Words are picked from a fixed 2048-word wordlist, with the last word encoding a checksum. Phrases are derived from cryptographically random bits using the Web Crypto API.

BIP39 details

  • 12 words — 128 bits of entropy, the most common choice.
  • 24 words — 256 bits of entropy, used for high-value cold storage.
  • The last word always encodes a checksum derived from the rest.

Security

Treat the phrase like cash. Anyone who reads it can spend the funds. Write it down on paper and store it offline.

Privacy

All generation runs 100% in your browser using crypto.getRandomValues(). Nothing is sent to any server.

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