BIP-39 Mnemonic Seed Phrase Generator (12/24 Words)
Generate 12-word (128-bit) and 24-word (256-bit) BIP-39 mnemonic seed phrases using browser CSPRNG. Safe offline simulation with zero secrets logged.
1 How to Use BIP-39 Mnemonic Seed Phrase Generator (12/24 Words)
- 1. Select 12 or 24 words.
- 2. Click Generate to roll entropy and calculate the BIP-39 checksum word.
- 3. Review seed phrase.
⚙️ Cryptographic Specifications
- Algorithm
- BIP-39 CSPRNG
- Execution Engine
- Web Cryptography API (SubtleCrypto)
- Environment
- Client Browser Sandbox
- Network Telemetry
- 0 Bytes (Zero Server Transmission)
🛡️ Security & Compliance
Enterprise developers can safely execute this tool with production secrets. Because execution takes place entirely within your browser's local V8 JavaScript runtime, no payloads are transmitted over HTTP, cached on third-party proxies, or stored in server logs.
Verified Safe for SOC2, HIPAA, and GDPR developer compliance audits.
Frequently Asked Questions
What is BIP-39?
Bitcoin Improvement Proposal 39 specifies the translation of computer randomness into human-readable mnemonic words from a 2048-word dictionary.
Is it safe to generate wallet seeds here?
This tool is 100% in-browser, but best security practice for production crypto wallets is to generate seed phrases on an air-gapped hardware wallet.
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