BIP39 Seed Studio

Mnemonic generator · checksum-aware word swapping · HD key derivation

Generate a BIP39 mnemonic, then swap any word for an alternative. Non-final words accept the full 2048-word list and the checksum word is recomputed automatically, while the last word is limited to choices that keep the phrase valid. Keys are derived entirely in your browser.

For learning and experimentation only. Do not use generated phrases to store real funds — treat any seed shown here as compromised.

Mnemonic length

Seed phrase

invalid

Words 1–-1 accept any of the 2048 words — the last word is auto-corrected to keep the checksum valid.

Last word: 0 valid choices

Derivation

BIP39 passphrase (optional)Derivation path

Derived keys

Cannot derive keys — the current phrase or path is invalid.