BIP39 Passphrase ジェネレーター
「BIP39 Passphrase ジェネレーター」はコード、データと QRに使えるブラウザツールです。入力内容と結果は通常この端末内で処理され、登録は必要ありません。
使い方
使い方
- Choose the number of words and an optional separator.
- Generate the passphrase locally with crypto.getRandomValues.
- Copy it into a secure password manager or your wallet setup, and keep it separate from your recovery phrase.
Passphrase versus mnemonic
A BIP39 passphrase is an optional extra secret combined with a valid BIP39 mnemonic by a wallet. This page only generates a passphrase string; it does not create, import, validate, or derive a mnemonic, seed, address, or wallet.
Local randomness and responsibility
Words are selected in your browser with crypto.getRandomValues and are not uploaded or stored by this page. The included word list has 128 entries, so entropy depends on the word count; eight words provide about 56 bits before any implementation or storage risks. For high-value wallets, consider a dedicated audited wallet or offline diceware process.
A passphrase can hide funds
Different passphrases produce different BIP39 wallets, including an empty passphrase wallet. A typo or lost passphrase can make funds unrecoverable, so record it accurately and store it separately from the mnemonic.
よくある質問
あわせて知りたいこと
Does this generate a recovery phrase?
No. It generates only an additional passphrase string. It does not generate or validate a BIP39 mnemonic.
Are the words sent to a server?
No. Generation and copying happen in your browser, and this page does not upload or save the result.
How should I store the passphrase?
Store it in a secure password manager or offline record, separately from the mnemonic. Do not share it or publish it.
Will a typo change my wallet?
Yes. BIP39 treats every passphrase as meaningful, so even one changed character leads to a different wallet.