BIP39 Mnemonic Generator

Generated entirely in your browser using cryptographically secure randomness. Never share a real recovery phrase with anyone or type it into any website — this tool is for generating test phrases or understanding the standard, not for securing real funds without independent verification.

How to use this BIP39 generator

  1. Choose how many words you want (24 is the most common for wallets).
  2. Click "Generate" for a fresh, valid mnemonic phrase.
  3. Each phrase includes a built-in checksum word for error detection.

What is BIP39?

BIP39 is a standard for representing a large random number as a sequence of common words, used by most cryptocurrency wallets to back up and restore the keys that control funds. The words come from a fixed list of 2048 English words, and the last word encodes a checksum of the rest.

Is it safe to generate a real wallet phrase in a browser?

The math here is correct and uses secure randomness, but for real funds, generating a seed phrase offline on a dedicated hardware wallet is the safer, industry-standard practice — any internet-connected device carries some risk.

Why does word count vary from 12 to 24?

More words mean more entropy (randomness) and a stronger key — 12 words already provides 128 bits of entropy, considered extremely secure, while 24 words gives 256 bits for maximum security margin.