Category
3 toolsCrypto & Web3 tools
Validate addresses, build wallet QRs, convert gas units.
- Runs in your browser
- Nothing uploads
- No account, no tracking
- Free — always
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Wei ↔ ETH
Gas Unit Converter
Convert between Wei, Gwei and Ether with full BigInt precision — perfect for gas estimates.
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4‑byte sig
Solidity Function Selector
Compute the 4‑byte function selector (keccak‑256) for any Solidity function signature.
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Crypto check
Crypto Address Validator
Auto-detect and validate BTC, ETH, LTC, DOGE and SOL addresses — catch typos before you send.
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