Crypto Tools

Ethereum Address Validator — Validate ETH Address & EIP-55 Checksum

Validate Ethereum addresses and verify or generate the EIP-55 mixed-case checksum in your browser. Detects format errors, shows the correctly checksummed address, and flags checksum mismatches. Uses a client-side keccak-256 implementation — your address never leaves your device.

  1. Paste or type an Ethereum address in the input field.
  2. The tool checks the format and calculates the EIP-55 checksum in your browser.
  3. See the correctly checksummed address and whether the input matches.

Frequently Asked Questions

What is EIP-55?
EIP-55 is an Ethereum checksum encoding for addresses. By using mixed upper and lower case hex characters based on a keccak-256 hash, typos in an address can be detected before a transaction is sent.
Is an all-lowercase Ethereum address valid?
Yes. All-lowercase (or all-uppercase) addresses are valid but do not include EIP-55 checksum protection. Mixed-case addresses are checksummed.
Is my address sent to a server?
No. The keccak-256 hashing and checksum verification run entirely in your browser. Nothing is uploaded.