BIP39 Mnemonic Generator & Validator
Generate and validate BIP39 mnemonic seed phrases for cryptocurrency wallets. Supports 12-24 word phrases.
Security Warning: This tool is for educational purposes. For real cryptocurrency wallets, generate mnemonics offline on an air-gapped computer or use a hardware wallet. Never share your mnemonic with anyone!
Generate Mnemonic
Mnemonic Phrase
Click "Generate Mnemonic" to create a new seed phrase
Validate & Derive Seed
Leave empty if not using a passphrase
What is BIP39?
BIP39 (Bitcoin Improvement Proposal 39) is a standard for generating mnemonic phrases that represent cryptographic keys. It provides a human-readable way to backup and restore cryptocurrency wallets.
How it works:
- Entropy: Random data (128-256 bits) is generated using a cryptographically secure random number generator
- Checksum: A checksum is calculated from the entropy and appended to ensure data integrity
- Word Mapping: The combined data is split into 11-bit segments, each mapped to a word from the BIP39 wordlist (2048 words)
- Seed Derivation: The mnemonic + passphrase are processed through PBKDF2 to derive a 512-bit seed
- Key Derivation: The seed is used with BIP32/BIP44 to generate hierarchical deterministic (HD) wallet keys
Security Levels:
- 12 words: 128 bits of entropy = 2^128 combinations (340 undecillion)
- 24 words: 256 bits of entropy = 2^256 combinations (more than atoms in universe)
Important Notes:
- Anyone with your mnemonic can access your funds - keep it secret!
- Write it down on paper and store in a secure location (safe, safety deposit box)
- Never store mnemonics digitally (no photos, no cloud storage, no email)
- The passphrase is optional but provides an additional security layer
- BIP39 is supported by most modern cryptocurrency wallets