Free BIP-39 Mnemonic Phrase Generator - Offline & Secure
Generate secure 12 or 24-word recovery phrases
Security Warning
- Never share your recovery phrase with anyone
- Never enter a phrase you intend to use on any website
- For real funds, generate on a trusted offline device
- This tool does not store or transmit any data
Word count:(128-bit entropy)
How to Use BIP-39 Mnemonic Generator
- 1
Choose word count
Select 12 words (128-bit entropy) or 24 words (256-bit entropy).
- 2
Click Generate
A new mnemonic phrase is created using cryptographic randomness.
- 3
Save securely
Write down the phrase on paper. Never store it digitally or share it with anyone.
Frequently Asked Questions
Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
Is this BIP-39 compliant?
Yes. The generator follows the BIP-39 standard exactly: cryptographic entropy, SHA-256 checksum, and the official 2048-word English wordlist.
Which wallets support these mnemonics?
All BIP-39 compatible wallets including MetaMask, Ledger, Trezor, Trust Wallet, Phantom, and most modern cryptocurrency wallets.
Should I use 12 or 24 words?
12 words (128-bit entropy) is secure for most uses. 24 words (256-bit entropy) provides extra security for very high-value wallets. Both are considered safe by current standards.
Learn more
About BIP-39 Mnemonic Generator
Generate cryptographically secure 12 or 24-word BIP-39 recovery phrases entirely in your browser. Uses the Web Crypto API for true randomness and SHA-256 for checksums. Your seed phrase is never transmitted or stored. Compatible with MetaMask, Ledger, Trezor, and all BIP-39 wallets.