Wallets & keys

Mnemonic to Seed Converter

Learn the distinction between a mnemonic phrase and its derived seed.

Runs locally

Security & privacy. Sensitive inputs and calculations stay on your device. No secrets are sent to the backend or saved in browser storage. Clear the form and result when finished. These key tools have not received an independent security audit; do not use it with real funds.

Use this tool

Runs on your device. No wallet secrets are sent to the server. These key tools have not received an independent audit; do not use with real funds.

English BIP39 with Unicode normalization. The optional passphrase changes the wallet.

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What this tool is for

BIP39 derives a binary seed from a mnemonic and an optional passphrase. A different passphrase produces a different seed; there is no reliable warning that you entered the wrong passphrase.

Supported behavior

English BIP39 with Unicode normalization. The optional passphrase changes the wallet.

Security & privacy

Sensitive inputs and calculations stay on your device. No secrets are sent to the backend or saved in browser storage. Clear the form and result when finished. These key tools have not received an independent security audit; do not use it with real funds.