Create a completely random, cryptographically valid seed phrase. Uses your browser's secure random generator. Choose BIP39 (12-24 words) or TON (24 words) standard.
Lock the words you want to keep by clicking the lock icon. Then hit Generate again — only the unlocked positions get new words, while locked ones stay in place.
Type specific words into any cells you want, leave the rest empty, and click Complete. The tool finds valid completions — multiple variants shown as clickable options.
Everything runs in your browser. No data leaves your device. No server calls. No tracking. No cookies. Verify in DevTools — zero network requests after page load.
BIP39: entropy (128-256 bits) + SHA-256 checksum
BIP39: checksum_bits = entropy_bits / 32
BIP39: total_bits = word_count × 11
TON: HMAC-SHA512(words, "") → PBKDF2 → byte[0] == 0x00
Both: 2048-word English wordlist (BIP-0039)