BIP39 Mnemonic Generator
Generate cryptographically secure 12 or 24-word mnemonic seed phrases for development and testing.
For Development & Testing Only
Never use generated mnemonics for real cryptocurrency wallets. This tool is for educational and development purposes only.
How It Works
Entropy: 12 words = 128 bits, 24 words = 256 bits of cryptographic randomness
Source: Uses crypto.getRandomValues() — the same API used for HTTPS and WebAuthn
Standard: BIP39 word list (2048 English words) with SHA-256 checksum
Privacy: Everything runs locally — no data leaves your browser
BIP39 Mnemonic Generator
BIP39 Mnemonic Generator generates 12 or 24-word seed phrases for development and testing.
Key Features
- Generate 12 or 24-word BIP39 mnemonics
- Cryptographically secure random generation
- Optional passphrase support
- Display derived wallet addresses
How to Use
- Choose 12 or 24 words from the dropdown
- Optionally add a BIP39 passphrase for extra security
- Copy the mnemonic phrase and derived addresses
Frequently Asked Questions
What is a BIP39 mnemonic?
A BIP39 mnemonic is a 12 or 24-word phrase used to derive cryptocurrency wallet keys. It is a standardized format for wallet backup and recovery.
Is this safe for real wallets?
This tool is intended for development and testing. For real wallets, use hardware wallets or dedicated wallet software with proper security measures.
What is the optional passphrase?
The passphrase (25th word) adds an extra layer of security to your mnemonic. Without it, anyone with the words can access the wallet.