Tools for security & it
Hashes, certificates, tokens and password generation. Sensitive input never leaves the browser, which is the only guarantee that actually holds.
23 tools · all client-side
Encoding
All encoding tools →Crypto
All crypto tools →- Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 checksums. Computed by your browser, never sent anywhere.
- HMAC GeneratorCompute Hash-based Message Authentication Codes (HMAC) using SHA-256, SHA-384, SHA-512, or SHA-1 via Web Crypto.
- Password & Secret Token GeneratorGenerate cryptographically secure passwords, API tokens, and passphrases. Includes entropy score, character sets, and ambiguous character filtering.
- BIP-39 Mnemonic & Entropy InspectorInspect, validate, and convert BIP-39 mnemonic phrases (12/15/18/21/24 words) and raw hex entropy with bit-level checksum verification.
- JWT DecoderDecode JSON Web Tokens (JWT) to inspect header and payload claims. Formats standard timestamps (iat, exp, nbf) and checks expiration.
- JWT Sign & GeneratorGenerate and cryptographically sign JSON Web Tokens (JWT) using HMAC (HS256, HS384, HS512) via Web Crypto API.
- Random String GeneratorCryptographically secure random string and token generator with customizable characters and format.
Files
All files tools →- Chmod Permissions CalculatorConvert Linux file permissions between Octal (e.g. 755), Symbolic (e.g. -rwxr-xr-x), and command syntax. Includes common presets and umask calculation.
- QR Data TransferMove text or a file between two devices with nothing but a screen and a camera. No network, no pairing, no server.
- Ethereum CREATE2 Deterministic Address CalculatorCalculate deterministic smart contract deployment addresses using EIP-1014 CREATE2 with deployer, salt, and initCode or code hash.
- EVM Bytecode Disassembler & Opcode ReferenceDisassemble raw EVM runtime or creation bytecode into assembly instruction streams with PC offsets, gas costs, and stack diffs.
- IPv4 Subnet & CIDR CalculatorCalculate IPv4 subnet masks, CIDR network ranges, usable host ranges, broadcast addresses, and wildcard masks.
- Merkle Tree & Proof Generator for Airdrops and WhitelistsGenerate standard OpenZeppelin-compatible Merkle Trees, root hashes, and per-leaf cryptographic inclusion proofs from address lists or data values.
- Ethereum RLP (Recursive Length Prefix) Encoder & DecoderEncode arbitrary JSON nested arrays/strings into Ethereum RLP hex bytes, and decode raw RLP byte streams into structured JSON and hierarchical trees.
- Solidity 4-Byte Function Selector Lookup & Keccak-256 CalculatorCalculate 4-byte function selectors from canonical signatures and reverse-lookup raw selectors against built-in ERC standard databases.
- Solana Address & PDA InspectorInspect Solana public keys, check Ed25519 curve membership (wallet vs PDA), decode hex/byte representation, and derive Program Derived Addresses (PDA) & ATAs.
- Solidity ABI & Signature InspectorParse Solidity contract ABI JSON into human-readable interface signatures, event topics, and error definitions.
- Solidity Calldata & EVM Raw Word DissectorDissect EVM transaction calldata into 4-byte method selectors and 32-byte (256-bit) ABI words with address, uint256, and boolean conversions.