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BIP39 Mnemonic Generator

Generate BIP39 seed phrases for cryptocurrency wallets. Entropy created entirely in your browser.

Security: Generated entirely in your browser using crypto.getRandomValues — nothing is transmitted. Never share your seed phrase. For maximum security, use a hardware wallet or air-gapped device.

Phrase length

1.once

2.swamp

3.shuffle

4.hungry

5.peace

6.draw

7.gain

8.ridge

9.few

10.fish

11.

12.faint

12 words · 128-bit entropy

Phrase (space-separated)

once swamp shuffle hungry peace draw gain ridge few fish faint

Verify word #

What is a BIP39 mnemonic?

BIP39 (Bitcoin Improvement Proposal 39) defines a method for generating a human-readable seed phrase from random entropy. The entropy is hashed and split into 11-bit groups, each mapping to a word in a 2048-word wordlist. The resulting phrase encodes enough information to deterministically derive an entire wallet of cryptocurrency key pairs. A 12-word phrase provides 128 bits of security; 24 words provides 256 bits.

Private & free — this tool runs entirely in your browser.