BIP39 Mnemonic Seed Phrase Generator
For testing only. These are development fixtures. Never import a phrase generated by a website into a wallet that holds real funds.
Entropy is drawn from the Web Crypto API and the checksum is computed locally with SHA-256, then mapped to the official BIP39 English wordlist — nothing is sent anywhere. Copy as a space-joined phrase, a numbered list, or a JSON array.
Checksum-valid BIP39 mnemonics for development
Generate throwaway BIP39 mnemonic seed phrases — the 12 to 24 word recovery phrases used by crypto wallets — for wallet UIs, blockchain integration tests, backup and restore flows, screenshots, and fixtures. Each phrase carries a valid SHA-256 checksum, so it passes real BIP39 validation.
Pick the entropy strength to set the length: 12 words (128 bits), 15 (160), 18 (192), 21 (224), or 24 (256). The phrase is generated in your browser and is not associated with any wallet or funds.