The developer tools you reach for every day, all in one place.

Converters, formatters, hashes, validators, and the small utilities you keep reopening stay together instead of getting lost across tabs.

GitHub

/ Tools

■

/ Tool Finder

109 tools

/ Address Checksum

Ethereum Address

/ Selected Tool

Address Checksum

Convert Ethereum addresses to checksum format

■ 01

What is EIP-55?

EIP-55 introduces a checksum for Ethereum addresses by capitalizing certain letters. This helps detect typos and prevents sending funds to incorrect addresses.

■ 02

How does it work?

The checksum is created by taking the Keccak-256 hash of the lowercase address. Each character in the address is then compared to the corresponding character in the hash - if the hash character is > = 8, the address cha…

■ 03

Sample Cases

Covers Lowercase to checksum, Wrong checksum correction, and Already checksummed so you can compare common inputs and outputs quickly.

/ Code

■

/ Integration

Source code from the selected tool, shown here alongside the live version on the right.

/ Source Code

TypeScript

typescript

// npm install viem

import { getAddress, isAddress } from 'viem';

// Convert address to EIP-55 checksum format
function toChecksumAddress(address: string): string {
  if (!isAddress(address)) {
    throw new Error('Invalid Ethereum address');
  }