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/bip39 — BIP39 Seed Phrase
Generate a BIP39 mnemonic recovery phrase (12–24 words) with crypto-grade randomness and a valid checksum, or validate one you already have. Everything runs in your browser — nothing is sent anywhere.

Generated locally with crypto.getRandomValues. A real recovery phrase is the master key to a wallet: never type one you use for funds into any website, and for serious holdings generate offline on an air-gapped device.

Related tools
Hash & Checksum HMAC Password UUID / ULID TOTP / 2FA Code Password Hash
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Stores only this report's id in your browser (localStorage) so a small note can pop up here once it ships. No account, nothing sent to us, no tracking. Clearing this site's data forgets it.
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