Ethereum Address Validator

1. Enter an Ethereum address — Type or paste an Ethereum address (starts with 0x followed by 40 hex characters).
2. Automatic validation — The address is validated in real-time. The tool checks format, hex characters, and EIP-55 checksum for mixed-case addresses.
3. View address details — See the checksum status, address format type, and character length.
4. Try examples — Click the Example button to test with valid Ethereum addresses.

All validation is performed 100% client-side in your browser. No address data is sent to any server.

EIP-55 (Ethereum Improvement Proposal 55) defines a method for adding checksum information to Ethereum addresses by using mixed-case characters. Since Ethereum addresses are case-insensitive hex strings, EIP-55 encodes a checksum in the capitalization of the letters (a-f) to help detect typing errors.

The checksum works by taking the Keccak-256 hash of the lowercase address (without 0x prefix). If the nth hex digit of the hash is 8 or higher (bit 3 set), the corresponding character in the address is capitalized. This creates a human-readable checksum that is backward-compatible with all existing Ethereum software.

Addresses in all-lowercase or all-uppercase are still technically valid, but they lack the error-detection benefits of the EIP-55 checksum. Most Ethereum wallets now display addresses in EIP-55 mixed-case format.