BIP39 Mnemonic Seed Phrase Generator

Generate 12-word or 24-word BIP39 mnemonic seed phrases for Bitcoin, Ethereum, Solana, and other cryptocurrency wallets. Validate existing seed phrases with checksum verification. Words are drawn from the standard 2048-word BIP39 English wordlist. Generated entirely in your browser — seed phrases never leave your device.

BIP39 Generator: Select word count (12 or 24) and click generate to create a BIP39 mnemonic phrase. The phrase can be used to back up and restore cryptocurrency wallets. Store it offline — never share it.

Generate Mnemonic

Create secure BIP39 seed phrases from random entropy

Mnemonic Phrase

You can edit this field to verify an existing phrase. Checksum validation is automatic.

Raw Entropy (Hex)

Optional Passphrase (BIP39 Extension)(Adds an extra layer of security)

100% Client-Side

Everything is generated locally in your browser. No data is sent to any server. Your privacy is guaranteed.

Wait! Before Using

For maximum security, download this page and run it offline. Never share your seed phrase with anyone.

Multi-Language

Supports 8 languages including English, Spanish, Japanese, and Chinese. Fully compliant with BIP39 standards.

Key Takeaways

Generates 12-word (128-bit) or 24-word (256-bit) mnemonic phrases
Follows the BIP39 standard used by Bitcoin, Ethereum, and most crypto wallets
Words are drawn from a standardized 2048-word English wordlist
The last word includes a checksum for error detection
Generated in your browser using cryptographic randomness — never transmitted

What is BIP39 Generator?

BIP39 Generator — A BIP39 Mnemonic Generator is a free tool that creates cryptographic seed phrases (12 or 24 words) for cryptocurrency wallet backup and recovery following the BIP39 standard.

Generate BIP39 mnemonic seed phrases with this free online tool. Create 12-word (128-bit entropy) or 24-word (256-bit entropy) recovery phrases compatible with Bitcoin (BTC), Ethereum (ETH), Solana (SOL), and all BIP39-compatible cryptocurrency wallets including MetaMask, Ledger, Trezor, and Trust Wallet. Words are selected from the standardized 2048-word BIP39 English wordlist with the last word serving as a checksum for error detection. Validate existing seed phrases to verify correct word order and checksum before wallet recovery. All generation uses cryptographic randomness in your browser — seed phrases are never transmitted to any server.

How to Use BIP39 Generator

1
Select the word count: 12 words (128-bit entropy) or 24 words (256-bit entropy).
2
Click Generate to create a new BIP39 mnemonic phrase with cryptographic randomness.
3
Write down the seed phrase on paper and store it securely offline — never digitally.
4
Use the Validate tab to verify an existing phrase's checksum before wallet recovery.

Key Features

12-word (128-bit) and 24-word (256-bit) BIP39 mnemonic generation

Checksum validation for existing seed phrases

Standard 2048-word BIP39 English wordlist

Compatible with MetaMask, Ledger, Trezor, Trust Wallet, and all BIP39 wallets

Client-side generation with Web Crypto API — phrases never leave your browser

Use Cases

Generating backup seed phrases for new cryptocurrency wallet setup

Validating existing mnemonic phrases before wallet recovery or migration

Testing BIP39 wallet import flows during cryptocurrency app development

Learning about HD wallet key derivation and mnemonic encoding standards

About BIP39 Generator

BIP39 (Bitcoin Improvement Proposal 39) defines a standard for encoding cryptographic seeds as human-readable word sequences. A 12-word phrase represents 128 bits of entropy, while a 24-word phrase represents 256 bits. The words come from a fixed 2048-word English wordlist, and the last word includes a checksum derived from the SHA-256 hash of the entropy — allowing wallets to detect typos during recovery.

Your seed phrase is the master key to all cryptocurrency wallets derived from it. Anyone who knows your seed phrase can access your funds. Never store seed phrases in cloud storage, email, screenshots, or password managers. Write them on paper or stamp them on metal, and store in a secure physical location. Test your recovery process with a small amount before funding the wallet.

Frequently Asked Questions

What is a BIP39 mnemonic seed phrase?: A BIP39 mnemonic is a set of 12 or 24 English words that encodes the master seed for a cryptocurrency wallet. It is used to back up and restore all accounts and private keys derived from that seed.
Is 12 words or 24 words more secure?: 24 words provides 256-bit entropy vs 128-bit for 12 words. Both are practically uncrackable, but 24 words offers a higher security margin for high-value wallets and long-term storage.
Which wallets support BIP39 seed phrases?: Nearly all modern wallets: MetaMask, Ledger, Trezor, Trust Wallet, Exodus, Phantom (Solana), and most Bitcoin, Ethereum, and multi-chain wallets follow the BIP39 standard.
Can I recover my wallet with just the seed phrase?: Yes, if the wallet uses BIP39 derivation. Enter your seed phrase in any compatible wallet to restore all accounts. You may also need the derivation path (e.g., m/44'/60'/0'/0 for Ethereum).
How should I store my seed phrase securely?: Write it on paper or stamp it on metal (fire/water resistant). Store in a safe, safety deposit box, or secure location. Never store digitally — no cloud, no photos, no password managers.
What happens if someone finds my seed phrase?: They can restore your wallet and access all funds. If you suspect your seed phrase is compromised, immediately transfer all assets to a new wallet with a freshly generated seed phrase.

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BIP39 Mnemonic Seed Phrase Generator

Frequently Asked Questions

What is a BIP39 mnemonic seed phrase?

A BIP39 mnemonic is a set of 12 or 24 English words that encodes the master seed for a cryptocurrency wallet. It is used to back up and restore all accounts and private keys derived from that seed.

Is 12 words or 24 words more secure?

24 words provides 256-bit entropy vs 128-bit for 12 words. Both are practically uncrackable, but 24 words offers a higher security margin for high-value wallets and long-term storage.

Which wallets support BIP39 seed phrases?

Nearly all modern wallets: MetaMask, Ledger, Trezor, Trust Wallet, Exodus, Phantom (Solana), and most Bitcoin, Ethereum, and multi-chain wallets follow the BIP39 standard.

Can I recover my wallet with just the seed phrase?

Yes, if the wallet uses BIP39 derivation. Enter your seed phrase in any compatible wallet to restore all accounts. You may also need the derivation path (e.g., m/44'/60'/0'/0 for Ethereum).

How should I store my seed phrase securely?

Write it on paper or stamp it on metal (fire/water resistant). Store in a safe, safety deposit box, or secure location. Never store digitally — no cloud, no photos, no password managers.

What happens if someone finds my seed phrase?

They can restore your wallet and access all funds. If you suspect your seed phrase is compromised, immediately transfer all assets to a new wallet with a freshly generated seed phrase.

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BIP39 Mnemonic Seed Phrase Generator

Key Takeaways

What is BIP39 Generator?

How to Use BIP39 Generator

Key Features

Use Cases

About BIP39 Generator

Frequently Asked Questions

BIP39 Mnemonic Seed Phrase Generator

Key Takeaways

What is BIP39 Generator?

How to Use BIP39 Generator

Key Features

Use Cases

About BIP39 Generator

Frequently Asked Questions