What is a mnemonic phrase?

A mnemonic phrase (also called a seed phrase or recovery phrase) is a sequence of 12 to 24 words that represents a cryptographic key in human-readable form. Think of it as a master password for your cryptocurrency wallet - anyone with this phrase can access your funds. The BIP39 standard defines how these phrases are generated from random data (entropy) and how they're converted into the cryptographic seeds that control digital wallets.

Tool description

This tool generates and validates BIP39-compliant mnemonic phrases commonly used in cryptocurrency wallets. You can generate random phrases of different lengths (12, 15, 18, 21, or 24 words), convert between entropy and mnemonic phrases, validate existing phrases, and derive cryptographic seeds with optional passphrases for additional security.

Features

  • Generate secure random mnemonic phrases (12-24 words)
  • Convert hexadecimal entropy to mnemonic phrases
  • Validate mnemonic phrase checksums
  • Derive cryptographic seeds from mnemonics
  • Optional passphrase support for BIP39 extension

Use cases

  • Creating new cryptocurrency wallet recovery phrases
  • Converting raw entropy into human-readable backup phrases
  • Validating mnemonic phrases from wallet recovery processes
  • Deriving seeds for hierarchical deterministic (HD) wallets
  • Testing mnemonic phrase implementations in cryptocurrency applications