BTC Seed Helper

Validate BIP-39 mnemonic phrases and recover missing words

🔒 100% private · No server · Works offline ⬇ Offline Version
Security Notice
  • Never enter a seed phrase holding real funds into an online tool. Download the offline version and use it air-gapped.
  • The optional BIP-39 passphrase (sometimes called 25th word) is a separate input during key derivation - it is NOT part of the mnemonic and cannot be recovered here.
  • Memorable phrases (sentences, names, quotes) are vulnerable to social engineering and dictionary attacks. If you use one, always protect it with a passphrase.

Leave one field blank to find all valid words for that position.