{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-05-20T20:47:38.262Z","discovery":{"catalog":"https://toolsly.tools/tools.json","llmsTxt":"https://toolsly.tools/llms.txt","sitemap":"https://toolsly.tools/sitemap.xml"},"relatedTools":[{"slug":"qr-code-reader","name":"QR Code Reader","url":"https://toolsly.tools/qr-code-reader"},{"slug":"qr-code-generator","name":"QR Code Generator","url":"https://toolsly.tools/qr-code-generator"},{"slug":"file-to-hex","name":"File to Hex Dump","url":"https://toolsly.tools/file-to-hex"},{"slug":"hex-to-file","name":"Hex to Binary File","url":"https://toolsly.tools/hex-to-file"},{"slug":"wifi-qr-code-generator","name":"Wi-Fi QR Code Generator","url":"https://toolsly.tools/wifi-qr-code-generator"},{"slug":"vcard-qr-code-generator","name":"vCard QR Code Generator","url":"https://toolsly.tools/vcard-qr-code-generator"},{"slug":"barcode-generator","name":"Barcode Generator","url":"https://toolsly.tools/barcode-generator"},{"slug":"base64-encode","name":"Base64 Encode","url":"https://toolsly.tools/base64-encode"}],"kind":"utility","slug":"bip39-mnemonic","name":"BIP39 Mnemonic Generator","description":"Generate a BIP39 mnemonic seed phrase (12/15/18/21/24 words) and the corresponding entropy + seed — or convert an existing mnemonic to its seed.","longDescription":"BIP39 is the standard that bitcoin and most other cryptocurrency wallets use to encode random entropy as a human-friendly word list. Pick a word count (12 words = 128 bits of entropy, 24 = 256 bits) and we'll roll fresh randomness via crypto.getRandomValues, derive the BIP39 checksum, and look up the matching words from the English wordlist. The seed (hex) is what wallets actually use to derive HD-wallet master keys (BIP32). You can also paste an existing mnemonic (with an optional passphrase) to compute the seed without generating new entropy. Runs entirely in your browser — your seed phrase never leaves this device.","category":"text","categoryName":"Text & Encoding","keywords":["bip39 mnemonic generator","bip39 seed phrase generator","bitcoin seed phrase generator","crypto wallet recovery phrase","bip39 to seed","bip39 mnemonic online","12 word seed phrase","24 word seed phrase","bip39 entropy","hd wallet seed","ethereum seed phrase","bip32 master seed","metamask seed generator","ledger seed words","bip39 english wordlist"],"badge":"Crypto","url":"https://toolsly.tools/bip39-mnemonic","inputs":[{"type":"select","key":"mode","label":"Mode","defaultValue":"generate","choices":[{"value":"generate","label":"Generate new mnemonic"},{"value":"decode","label":"Mnemonic → seed (decode existing)"}]},{"type":"select","key":"wordCount","label":"Word count (generate only)","defaultValue":"12","choices":[{"value":"12","label":"12 words (128-bit entropy)"},{"value":"15","label":"15 words (160-bit)"},{"value":"18","label":"18 words (192-bit)"},{"value":"21","label":"21 words (224-bit)"},{"value":"24","label":"24 words (256-bit)"}]},{"type":"text","key":"mnemonic","label":"Existing mnemonic (decode mode)","multiline":true,"defaultValue":"","placeholder":"Paste a 12/15/18/21/24-word mnemonic separated by spaces…"},{"type":"text","key":"passphrase","label":"Passphrase (optional)","defaultValue":"","placeholder":"BIP39 passphrase — empty if none"}],"outputs":[{"key":"mnemonic","label":"Mnemonic"},{"key":"entropyHex","label":"Entropy (hex)"},{"key":"seedHex","label":"Seed (hex, 64 bytes)"},{"key":"summary","label":"Summary"}],"invocation":{"webUi":"https://toolsly.tools/bip39-mnemonic","api":null,"notes":"Currently invoked via the web UI at `webUi`. Inputs are form fields; outputs are structured text values. A remote MCP/REST API is planned."}}