Cryptography tools

Hashing, encryption, encoding and address tools that run entirely in your browser — fast, free, and private.

🔒 100% in your browser — nothing is uploaded

• Hash Generator

  Generate SHA-256, SHA-512, Keccak-256, RIPEMD-160, MD5 and more from text or hex — in your browser.

• AES Encryption

  Encrypt and decrypt text with AES-256-GCM and a password. Everything stays in your browser.

• Crypto Address Validator

  Check whether a Bitcoin or Ethereum address is valid, with its type, network and checksum.

• Base64, Hex & Base58 Converter

  Convert text between Base64, Hex, Base58, Binary and UTF-8 — encode and decode in your browser.

• BIP39 Seed Phrase Generator

  Generate and validate BIP39 mnemonic seed phrases (12–24 words) and derive the seed — in your browser.

• Password Generator

  Generate strong, random passwords with a crypto-secure RNG. Length, character sets and entropy — nothing uploaded.

• JWT Decoder

  Decode a JSON Web Token (JWT) — inspect its header, payload and claims in your browser. Nothing uploaded.

• HD Wallet Address Generator

  Derive Bitcoin (legacy & SegWit) and Ethereum addresses from a BIP39 phrase (BIP32/44/84) — watch-only, in your browser.

• RSA Key Generator

  Generate an RSA key pair (2048/3072/4096-bit) and export it as PEM — in your browser, nothing uploaded.

• Message Signer & Verifier

  Sign and verify a message with an ECDSA secp256k1 key (Bitcoin/Ethereum’s curve) — in your browser.

• Crypto QR Code Generator

  Make a QR code for a Bitcoin or Ethereum address or payment request (BIP21/EIP-681) — in your browser.

• Merkle Tree Calculator

  Compute the Merkle root and tree of a list of leaves — SHA-256 or Bitcoin double SHA-256, in your browser.