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BIP39 Mnemonic Generator
Generate BIP39 standard mnemonics for cryptocurrency wallet backup
💡 Security Info:
  • This tool runs entirely in your browser locally and does not send any data to servers.
  • Web Crypto API is only available in secure contexts (HTTPS or localhost).
  • For maximum security, it is recommended to clear browser cache or close the page after use.

What is BIP39 Mnemonic?

BIP39 (Bitcoin Improvement Proposal 39) is a standard for generating human-readable mnemonic phrases for cryptocurrency wallets. It converts random entropy into a sequence of words from a standardized wordlist, making it easier for users to back up and restore their cryptocurrency wallets. The mnemonic phrase can be used to derive a seed, which in turn generates the private keys for your crypto assets.

Why Use BIP39 for Crypto Wallets?

  • ✓ Standardized Format: BIP39 is widely adopted across the cryptocurrency industry, supported by hardware wallets (Ledger, Trezor) and software wallets (MetaMask, Electrum).
  • ✓ Multi-Language Support: BIP39 wordlists are available in multiple languages, making it accessible to users worldwide.
  • ✓ Checksum Protection: The last word includes a checksum, helping to detect errors when restoring wallets.
  • ✓ Flexible Security: Choose from 12 to 24 words for different security levels (128-256 bits of entropy).

How to Use This BIP39 Generator

  1. Select Language: Choose your preferred language for the mnemonic wordlist.
  2. Choose Mnemonic Strength: Select 12, 15, 18, 21, or 24 words (higher = more secure).
  3. Optional Passphrase: Add a passphrase for extra security (BIP39 passphrase feature).
  4. Generate: Click "Generate Mnemonic" to create your secure seed phrase.

Security Best Practices

  • ⚠ Never Share: Your mnemonic phrase is the master key to your crypto assets. Never share it with anyone.
  • ⚠ Offline Storage: Store your mnemonic phrase offline in a secure location. Consider using a hardware wallet for large amounts.
  • ⚠ Multiple Backups: Create multiple secure backups in different physical locations.
  • ⚠ Test Recovery: Always test wallet recovery with a small amount before storing significant funds.

BIP39 Mnemonic Strength Options

Different mnemonic lengths provide different levels of security:

  • 12 words (128-bit): Standard security, sufficient for most users
  • 18 words (192-bit): Enhanced security for larger holdings
  • 24 words (256-bit): Maximum security for institutional or large amounts
🔒 Security Note:

This tool uses the Web Crypto API for cryptographically secure random number generation. All operations are performed locally in your browser. For maximum security, use this tool on a secure, offline device and verify the integrity of your generated wallets before storing significant funds.