Web3 & Ethereum Tools
Free online Web3 tools for Ethereum development — convert between Wei, Gwei, and Ether with exact precision, and more utilities on the way. Everything runs in your browser; only paste public data like addresses, never a private key or seed phrase.
3 tools in Web3
NewWeb3
ETH Unit Converter
Convert Wei, Gwei, and Ether with exact precision, then estimate Ethereum gas fees. Free ETH unit calculator — no rounding errors or sign-up.
NewWeb3
Ethereum Address Checksum
Validate an Ethereum address and convert it to the EIP-55 checksummed format. Free, private, and entirely browser-based.
NewWeb3
Keccak-256 & Solidity Signature Calculator
Calculate Ethereum Keccak-256 hashes, Solidity function selectors, and event topic0 hashes from text, hex, or signatures.