BIP39 Mnemonic Tools

About BIP39 Mnemonic Tools

BIP39 Mnemonic Tools is a comprehensive utility for working with BIP39 mnemonic seed phrases. It allows you to generate cryptographically secure mnemonic phrases of 12, 15, 18, 21, or 24 words, validate existing mnemonic phrases, and convert mnemonics to seed hex. The tool supports the standard BIP39 specification used by most cryptocurrency wallets.

What is BIP39?

BIP39 (Bitcoin Improvement Proposal 39) is a standard for generating deterministic keys from a mnemonic phrase. It defines how to create a sequence of words (mnemonic) that can be used to derive cryptocurrency wallet keys. The mnemonic is easier to write down and remember than raw binary or hexadecimal data.

How secure are BIP39 mnemonics?

BIP39 mnemonics are highly secure when generated properly with cryptographic randomness. A 12-word mnemonic has 128 bits of entropy (2^128 possible combinations), while a 24-word mnemonic has 256 bits of entropy (2^256 combinations). This makes them virtually impossible to guess or brute-force attack.

What's the difference between 12 and 24 words?

The main difference is the level of entropy (randomness). 12 words provide 128 bits of entropy (very secure), while 24 words provide 256 bits of entropy (extremely secure). Most wallets use 12 words as a balance between security and usability. 24 words are recommended for high-value storage or institutional use.

Can I use this to recover my wallet?

This tool validates BIP39 mnemonics and converts them to seed hex, but it doesn't create wallet addresses or private keys. To recover a wallet, you need to use wallet software that supports BIP39. This tool is useful for verifying that your mnemonic phrase is valid before attempting recovery.

Is it safe to generate mnemonics online?

For real funds, always generate mnemonics offline using trusted wallet software or hardware wallets. This online tool is suitable for testing, development, or educational purposes. Never use online-generated mnemonics for wallets holding real cryptocurrency.

Key Features

• Generate BIP39 mnemonics: 12, 15, 18, 21, or 24 words
• Validate existing mnemonic phrases
• Display entropy (randomness source) in hexadecimal
• Show entropy strength in bits
• Convert mnemonic to 512-bit seed hex
• Verify checksum integrity
• Client-side generation for security
• Compatible with all BIP39-compliant wallets
• No data transmission or storage