Keys
BIP39 mnemonic
Validate a BIP39 mnemonic and derive entropy plus seed bytes.
How To Use It
Paste a mnemonic and optional passphrase. The result includes entropy and seed hex.
Example
abandon ... about with passphrase TREZOR
Runs locally in WebAssembly
Live Tool
Inputs stay in this browser tab. No transaction broadcast or remote Bitcoin API calls are used.