NOTE: If you share the information generated by this page with anyone, they can steal your assets. Anyone asking you to share your secret recovery phrase or BIP32 root key is a scammer. Do NOT copy & paste information from this page or send it to anyone offering to help you on Twitter, Discord, Telegram, Etherscan, or Line. They will steal your coins.
Guide:
- A seed phrase is a set of 12, 15, 18, 21, or 24 words used to recover your wallet.
- Generated phrases comply with the BIP39 standard.
- Keep your seed phrase safe and private.
- Click "Generate Seed Phrase" to create a new one.
- Use "Advanced Mode" for custom entropy, derivation paths, and seed conversion.
Advanced Mode:
- Input your own entropy to create a seed phrase.
- Convert a mnemonic code to a seed.
- Calculate derivation paths and addresses from your mnemonic.
BIP39 Wordlist:
The complete wordlist used to generate seed phrases is compliant with the BIP39 standard. Refer to BIP39 Wordlists for more details.
| Feature | Details |
|---|---|
| Price | Free |
| Rendering | Client-Side Rendering |
| Language | JavaScript |
| Paywall | No |
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About This Tool
This BIP39 Seed Phrase Generator is designed to help users create secure and cryptographically compatible seed phrases (mnemonics) for cryptocurrency wallets. It uses the BIP39 standard to ensure compatibility across various wallets and blockchain systems.
Key Features:
- Generate 12, 15, 18, 21, or 24-word seed phrases with a secure random number generator.
- Support for multiple mnemonic languages for better accessibility.
- Advanced Mode for converting mnemonic codes to seeds, calculating derivation paths, and using custom entropy.
- A built-in BIP39 wordlist tab for reference and transparency.
Important: Your seed phrase is the key to your digital assets. Ensure that you never share it with anyone and keep it safe in a secure location. This tool operates locally on your browser, and no data is stored or transmitted online.
How It Works?
The BIP39 Seed Phrase Generator operates based on the principles of the BIP39 standard, which is a widely accepted protocol in the cryptocurrency ecosystem for generating secure, human-readable mnemonic phrases that serve as a backup for private keys. Here’s a detailed explanation of its process:
1. Entropy Generation
What is Entropy? Entropy refers to the random data used as the foundation for creating a seed phrase. In the context of BIP39, entropy is a sequence of random bits that ensure the uniqueness and security of the generated mnemonic.
Entropy Lengths: The entropy used for BIP39 is typically between 128 and 256 bits, depending on the desired mnemonic length:
- 128 bits → 12 words
- 160 bits → 15 words
- 192 bits → 18 words
- 224 bits → 21 words
- 256 bits → 24 words
How Is Entropy Generated? This tool uses a cryptographically secure random number generator (CSPRNG) built into modern browsers (e.g.,
crypto.getRandomValues()) to generate high-quality random entropy.
2. Checksum Calculation
- After generating the entropy, the tool computes a checksum. The checksum ensures the integrity of the mnemonic and helps detect errors during manual entry.
- The checksum is derived by taking the first
entropy length / 32bits of the SHA-256 hash of the entropy. - For example:
- If the entropy is 128 bits, the checksum is 4 bits (
128 / 32 = 4). - If the entropy is 256 bits, the checksum is 8 bits (
256 / 32 = 8).
- If the entropy is 128 bits, the checksum is 4 bits (
3. Entropy + Checksum
- The entropy and checksum are concatenated to form a new binary sequence.
- For example:
- Entropy:
101010101010...(128 bits) - Checksum:
1100(4 bits) - Combined:
101010101010...1100(132 bits)
- Entropy:
4. Binary-to-Word Conversion
- The concatenated binary sequence is divided into 11-bit chunks. Each 11-bit chunk corresponds to a specific word in the BIP39 wordlist (a predefined list of 2048 words).
For example:
- Binary chunk:
00000000001 - Corresponding word:
ability(from the wordlist).
- Binary chunk:
The result is a mnemonic phrase comprising 12, 15, 18, 21, or 24 words, depending on the length of the original entropy.
5. Seed Generation (Advanced Mode)
- The mnemonic phrase is used to derive a binary seed using the PBKDF2 function (Password-Based Key Derivation Function 2).
- Inputs:
- Mnemonic: The generated seed phrase.
- Passphrase: An optional password provided by the user for additional security.
- PBKDF2 uses HMAC-SHA512 with 2048 iterations to produce a 512-bit seed.
- Output: The 512-bit seed is used as the master private key for hierarchical deterministic (HD) wallets, following the BIP32 standard.
6. Derivation Paths
- Using the generated seed, the tool calculates addresses and private keys for specific cryptocurrencies based on derivation paths (defined by BIP44, BIP49, and BIP84 standards).
- Each derivation path specifies:
- The coin type (e.g., Bitcoin, Ethereum).
- The account index.
- The purpose (legacy, SegWit, etc.).
7. Mnemonic Language
- The tool supports multiple languages for the mnemonic phrase, including English, Japanese, Spanish, French, and more.
- Each language has its own unique wordlist of 2048 words, ensuring compatibility across regions.
8. Security and Privacy
- Local Execution:
- The tool runs entirely within your browser, ensuring no data is sent over the internet.
- All entropy generation, mnemonic creation, and seed derivation occur locally.
- Best Practices:
- Users are advised to never share their seed phrase or mnemonic.
- Avoid copying and pasting sensitive information to prevent accidental leaks.
9. Custom Entropy (Advanced Feature)
- Users can input their own entropy (in hexadecimal format) to create a mnemonic.
- The tool ensures the provided entropy is valid and matches the required bit lengths for BIP39.
- This feature allows for greater customization while adhering to the standard's requirements.
10. BIP39 Wordlist
- The wordlist consists of 2048 unique words, carefully selected for:
- Easy memorization.
- Uniqueness (no two words share the same prefix for up to 4 letters).
- Compatibility with different languages.
- The tool includes a reference tab for users to explore the wordlist and verify their mnemonic phrases.
Summary Workflow
- Entropy Generation: Secure random numbers are generated.
- Checksum Calculation: A checksum is added to ensure integrity.
- Mnemonic Creation: Binary data is converted to human-readable words.
- Seed Derivation: PBKDF2 converts the mnemonic into a binary seed.
- Address Generation: Derivation paths calculate cryptocurrency addresses.
This tool simplifies these complex steps, allowing users to create, verify, and use their seed phrases with confidence and security.
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