DevToolKit

BIP39 Mnemonic Generator

Securely generate, validate, and convert BIP39 recovery phrases. Supports 12-24 words, multiple languages, and optional passphrases. 100% private and client-side.

Keep your recovery phrase secret and offline.
Click to reveal words
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How to Use

Generating a secure recovery phrase is simple and private. All operations are performed locally in your browser.

Generating a Phrase

  1. Select Length: Choose between 12 and 24 words. More words provide higher entropy.
  2. Select Language: Choose your preferred BIP39 wordlist language.
  3. Optional Passphrase: Add a BIP39 passphrase for extra security. Note: you will need both the words and the passphrase to recover your wallet.
  4. Copy and Secure: Copy your words and store them safely offline. Never share your phrase with anyone.

About This Tool

What is BIP39?

BIP39 (Bitcoin Improvement Proposal 39) is the industry standard for mnemonic recovery phrases. It converts random entropy into a human-readable list of words, making it easier to back up and restore digital wallets.

The standard includes a checksum, ensuring that if you mistype a word during recovery, the software can detect the error instantly.

Why Use This Tool

Why use our generator?

Most online generators send your sensitive data to their servers. DevToolkit uses the native Web Crypto API and the audited @scure/bip39 library to ensure 100% client-side execution. Your security is built into our architecture.

FAQ

Is it safe to generate my recovery phrase here?
Yes. This tool runs 100% locally in your browser using the cryptographically secure Web Crypto API. Your phrases, entropy, and seeds are never sent to a server or stored anywhere. For maximum security, we recommend using this tool while offline.
What is BIP39?
BIP39 (Bitcoin Improvement Proposal 39) is a standard for generating a mnemonic code—a group of easy-to-remember words—for the generation of deterministic wallets. It is used by almost all modern hardware and software crypto wallets.
How many words should I use?
Standard security usually starts at 12 words (128 bits of entropy). For high-security requirements, 24 words (256 bits of entropy) are recommended. Both are widely supported by major wallets.
What is the optional passphrase?
A BIP39 passphrase (sometimes called a '13th' or '25th' word) acts as an extra layer of security. It is combined with the mnemonic to create a completely different seed. Without both the mnemonic and the passphrase, the wallet cannot be accessed.
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