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EIP-55 checksum

Check whether an Ethereum address carries a valid EIP-55 checksum, or write it with one, and see how many letters are in the wrong case.
Your data stays in this tabGives you Results to copy, Share text, Receipt
Address

Result

The result shows here as you type.

Use it forCheck an address's case, or write it with its checksum.

Good to knowIt works in this tab and has no code that sends what you type. Open the Receipt after a run to see the page's own count of network calls.

  • Checksum
  • Address checksum
  • Eip55
  • Eip 55
  • Mixed case

Where your data goesNowhere. The work happens in this tab.