BIP39 Mnemonic Generator

Mnemonic Size

🔒 SECURE OFFLINE GENERATION

What is a BIP39 Mnemonic Seed Phrase?

BIP39 (Bitcoin Improvement Proposal 39) defines a protocol for generating a mnemonic sentence — a group of easy-to-remember words — to write down as a backup for cryptocurrency wallets. This phrase is then converted into a binary seed, which is used to derive all public/private keys using hierarchical deterministic wallets (BIP44).

Warning: Keep your seed phrase secure

Your seed phrase represents absolute ownership of your wallet's funds. Never share your phrase with anyone, and never store it in digital files or cloud services. Write it down on physical paper or stamp it in metal, and store it in a secure location.

100% Private & Client-Side

Your 12/24-word seed phrase never leaves your browser — not even for a millisecond.

Verified Private

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No Server Transmission All computation runs in your browser. Zero data sent to our servers.

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No Storage We store nothing. No databases, no logs, no cookies with your input.

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Works Offline Once loaded, this tool works even with no internet connection.

Open-source on GitHub — read and verify the exact code powering this tool. View Source Code →

BIP39 Mnemonic Generator

What is a BIP39 Mnemonic Seed Phrase?

Warning: Keep your seed phrase secure

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