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You can use this tool 100% offline. For security it is preferable to use offline fresh system install or system on live usb. Download standalone offline file below and open it in a browser.
Remember to have a proper backup of your seed phrase. You can secure your seed phrase on solid seed phrase storage tool like Coinplate.
With BIP39 recovery phrase (also called mnemonic phrase), user can backup and recover Bitcoin and other cryptocurrency wallets without the need to use complicated private keys.
The BIP39 protocol uses a list of 2048 carefully chosen english words. Although the lists in different languages exists, it is usually not recommended to use them because most wallets do support only english words. Read more about BIP39 standard.
related: BIP39 Wordlist , BIP39 compatible wallets list
Check out also our BIP39 Seed Phrase Generator
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