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Read more at the official BIP39 spec
Read more at the official BIP32 spec
See the demo at bip32.org
Read more at the official BIP44 spec
Read more at the official BIP49 spec
Use private keys at brainwallet.org. Be careful - it can be easy to make mistakes if you don't know what you're doing.
Entropy values must be sourced from a strong source of randomness. This means flipping a fair coin, rolling a fair dice, noise measurements etc. Do NOT use phrases from books, lyrics from songs, your birthday or street address, keyboard mashing, or anything you think is random, because chances are overwhelming it isn't random enough for the needs of this tool.
Do not store entropy.
Storing entropy (such as keeping a deck of cards in a specific shuffled order) is unreliable compared to storing a mnemonic. Instead of storing entropy, store the mnemonic generated from the entropy. Steganography may be beneficial when storing the mnemonic.
The random mnemonic generator on this page uses a cryptographically secure random number generator. The built in random generator can generally be trusted more than your own intuition about randomness. If cryptographic randomness isn't available in your browser, this page will show a warning and the generate button will not work. In that case you might choose to use your own source of entropy.
You are not a good source of entropy.
Please refer to the software license for more detail.
The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
This tool is interoperable with any BIP39 wallet.
Some similar tools to this one (ie not consumer wallets) are
You can use this tool without having to be online.
In your browser, select file save-as, and save this page as a file.
Double-click that file to open it in a browser on any offline computer.
Alternatively, download the file from the repository - https://github.com/iancoleman/bip39
Get the source code from the repository - https://github.com/iancoleman/bip39
BitcoinJS - https://github.com/bitcoinjs/bitcoinjs-lib
jsBIP39 - https://github.com/iancoleman/jsbip39
sjcl - https://github.com/bitwiseshiftleft/sjcl
jQuery - https://jquery.com/
Twitter Bootstrap - http://getbootstrap.com/