EVMTools

Free online tools for Ethereum and cryptocurrency developers. No sign-up required.

Crypto Tools

Encode and decode Ethereum ABI data. Input function signatures and parameters to generate calldata.

Generate Keccak256 hashes from text input. The hash function used by Ethereum and Solidity.

Generate secure BIP39 mnemonic seed phrases (12 or 24 words) for cryptocurrency wallets.

Convert between Ethereum units: Wei, Gwei, and ETH. Essential for gas and transaction calculations.

Calculate Ethereum transaction costs from gas limit and gas price. Estimate fees in ETH and USD.

Convert Ethereum addresses to EIP-55 checksummed format for safe usage in transactions.

Validate cryptocurrency wallet addresses for Ethereum, Bitcoin, and Solana.

Convert between hexadecimal and decimal numbers. Useful for Ethereum block numbers, values, and calldata.

Learn how Keccak256 hashing works, why Ethereum uses it, and how it differs from SHA-3.

Understand how Ethereum ABI encoding works, from function selectors to parameter encoding.

A complete guide to Ethereum gas fees: what they are, how they're calculated, and how to optimize them.

Learn how BIP39 mnemonic seed phrases work, how they generate keys, and best practices for security.