BIP39 mnemonic generator

Client

Generate an English recovery phrase with browser randomness—validate Web3 formats on Web3 check.

About BIP39 mnemonic generator

Generate English BIP-39 recovery phrases (12–24 words) with browser CSPRNG—copy locally; not a wallet. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Limits and safety

Utilities here are for development and inspection—do not paste live production keys, PANs, or recovery codes into any browser tab you do not control.

Sensitive. Mnemonics control funds—generate only on a device you trust, never paste a real seed into chat, and prefer a hardware wallet workflow for large holdings.

English BIP-39 wordlist only—check addresses with Web3 format check or compare with password generator for unrelated secrets.

Generate

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Entropy comes from crypto.getRandomValues in your browser. Checksum bits are derived per BIP-39; this page does not derive wallet addresses or seeds for specific chains.

Nearby workflows on Toolcore

  • Password generator — Random passwords with length and character sets—generated in your browser. before you trust a token, digest, or key material in production.
  • Random string generator — Random alphanumeric, hex, Base64 URL-safe, or custom tokens—entropy hint, local only. before you trust a token, digest, or key material in production.
  • Web3 address & key check — Validate 0x address length and EIP-55 checksum; check 64-digit hex private key shape and secp256k1 range—browser-only. before you trust a token, digest, or key material in production.
  • Encrypt & decrypt — Encrypt, decrypt, hash (AES, DES, RC4, Rabbit, TripleDES, MD5, SHA) and Base64—client-side. before you trust a token, digest, or key material in production.

Common use cases

  • Prototype wallet flows with a standards-compliant wordlist during development.
  • Teach how checksum bits extend entropy in BIP-39 phrases.
  • Create a throwaway test mnemonic for local sandbox apps (never for real funds).

Common mistakes to avoid

  • Using browser-generated seeds for mainnet savings

    Treat this as a convenience tool—high-value holdings deserve audited, air-gapped generation.

  • Storing the phrase in screenshots or chat

    Anyone with the mnemonic controls the wallet—copy offline and delete traces.

FAQ

Which languages are supported?

English BIP-39 wordlist only on this page.

Does this show my wallet address?

No—only the mnemonic words; derivation paths and addresses depend on your wallet software.

More tools

Related utilities you can open in another tab—mostly client-side.