What is the EIP-55 checksum?

EIP-55 encodes a checksum into the capitalisation of the hex characters in an Ethereum address. Wallets and tools that support EIP-55 reject addresses where the capitalisation does not match the checksum, catching copy-paste errors.

Does it work for ERC-20 token addresses?

Yes. ERC-20 token contract addresses use the same format as regular Ethereum addresses and are validated identically.

Can I validate multiple addresses at once?

Yes. Paste a newline-separated list of addresses and the validator checks each one and reports results in bulk.

Best Free Ethereum Address Validator

Sending cryptocurrency to an invalid address results in permanent loss of funds — there is no recovery. devtoolkit.sh's Ethereum Address Validator checks any Ethereum address for correct format (40 hex characters with a 0x prefix) and validates the EIP-55 mixed-case checksum that guards against transcription errors. It immediately tells you whether an address is valid, invalid, or valid but missing the checksum encoding. This is essential for developers building Web3 applications, smart contract integrations, and payment processors that accept ETH or ERC-20 tokens. All validation runs client-side — no addresses are transmitted anywhere.

FAQ

What is the EIP-55 checksum?: EIP-55 encodes a checksum into the capitalisation of the hex characters in an Ethereum address. Wallets and tools that support EIP-55 reject addresses where the capitalisation does not match the checksum, catching copy-paste errors.
Does it work for ERC-20 token addresses?: Yes. ERC-20 token contract addresses use the same format as regular Ethereum addresses and are validated identically.
Can I validate multiple addresses at once?: Yes. Paste a newline-separated list of addresses and the validator checks each one and reports results in bulk.