BIP39 Passphrase Generator

Generate real 12- or 24-word BIP39 mnemonics with an optional passphrase.

BIP39 Passphrase Generator
Local input
Output
Processing…
About this tool

Made for the task at hand.

Create a genuine BIP39 English recovery mnemonic using secure browser randomness and the official 2,048-word list. Choose 128 bits of entropy for 12 words or 256 bits for 24 words, with an optional passphrase that wallets combine with the mnemonic during seed derivation.

How to use

  1. Choose a 12-word or 24-word mnemonic and optionally enter a BIP39 passphrase.
  2. Generate the mnemonic in a private, offline environment.
  3. Write down and verify the words and passphrase separately; never store them in cloud notes or screenshots.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Is the passphrase the same as the mnemonic?

No. The mnemonic is the generated word sequence. The optional passphrase is an additional secret, and losing or changing it derives a different wallet seed.

Is it safe to create a real wallet phrase online?

This implementation runs locally, but a general-purpose browser is not an ideal environment for valuable wallet secrets. Prefer a reputable hardware wallet or a verified offline setup for real funds.