Checksum mismatch
verify the exact wordlist, word order, spacing and Unicode normalization.
BIP39 Mnemonic Phrase Generator
Create mnemonic data for learning, testing and wallet-development workflows—with a security warning before the first generation action.
Crypto & SecurityDirect answer
A BIP39 mnemonic phrase encodes entropy plus a checksum as a sequence of 12, 15, 18, 21 or 24 words. This page can generate a phrase, accept an optional passphrase and show QR or derivation-path previews, but it must be treated as a test tool until randomness, wordlists, normalization and network behavior are independently audited.
Security First: Use this generator only with disposable test data. Create production wallet secrets in a reviewed offline workflow.
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Generation Options
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Your Mnemonic Phrase
1gaze
2laugh
3music
4surround
5solve
6garment
7taste
8bracket
9atom
10culture
11act
12green
13yard
14dinosaur
15ask
16winter
17derive
18camp
Strong: This mnemonic has high randomness.
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Derivation Path Preview
BIP44
m/44'/60'/0'/0/0Warning: Anyone with this phrase can access derived funds. Treat generated phrases as visible test data; do not use them for a production wallet.
How to use it
Enter the source data: Before generating anything, switch to a test-only workflow and close screen recording, cloud clipboard and browser extensions that may capture page content.
Choose the relevant settings: Choose 12, 15, 18, 21 or 24 words and an available wordlist. Add a passphrase only for a test vector, then generate the mnemonic.
Review and verify the result: Verify the checksum and expected derivation path with an independent implementation. Avoid saving the QR preview or phrase in cloud-backed screenshots or notes.
Key capabilities
- BIP39 word-count options from 12 to 24 words.
- Checksum-aware mnemonic output.
- Optional passphrase field for test scenarios.
- QR preview and BIP44-style derivation-path preview.
- Copy/save controls that require prominent risk labeling.
Best use cases
- Generate disposable fixtures for wallet UI and parser tests.
- Teach how word count, checksum and passphrase relate to a seed.
- Compare derivation-path output against independent test vectors.
Limits and safety notes
- A valid BIP39 checksum does not prove that a phrase was generated securely. Entropy quality, Unicode normalization, wordlist correctness, passphrase handling, derivation paths, clipboard behavior, analytics and dependencies all matter. Real seed phrases control funds and should be handled offline under a reviewed process.
- Use sample or non-production data. The current page describes local processing, but sensitive secrets still require an independent code and network audit before this can be treated as a security guarantee.
Troubleshooting
Derived address differs
confirm passphrase, coin type, account, change and address-index path.
A phrase appeared in history or sync
treat it as compromised and never fund a wallet derived from it.
Frequently asked questions
What is a BIP39 mnemonic phrase?
It is a human-readable encoding of entropy and checksum bits using an ordered wordlist. Wallet software then derives a binary seed from the mnemonic and optional passphrase.
Are 12 and 24 words both valid?
BIP39 defines valid lengths of 12, 15, 18, 21 and 24 words when the entropy and checksum relationship is correct. More words do not compensate for an insecure random source or unsafe handling.
Should I use this generator for a real wallet?
No. Use this page only with disposable test data. Create production wallet secrets in a reviewed offline workflow, and verify every backup without exposing the phrase or key.
Is it safe and private?
Short answer: Use sample or non-production data. The current page describes local processing, but sensitive secrets still require an independent code and network audit before this can be treated as a security guarantee.
Does it work on mobile?
The layout adapts to narrow screens. File selection, camera access, clipboard actions and downloads still depend on the permissions and capabilities of the mobile browser.
Related tools
Use the tool
Use this page only with disposable test data. For production key creation, follow a reviewed offline wallet process and independently verify every generated value.