Free Ethereum Address Validator

EIP-55 is a capitalization scheme for Ethereum addresses that allows wallets to detect typos. A checksummed address has mixed upper/lower case letters.

Yes — the tool can generate a random 20-byte hex address. Note: this is not a real wallet and has no associated private key.

Yes, completely free.

Absolutely. The Ethereum Address Validator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Ethereum Address Validator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Ethereum Address Validator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Ethereum Address Validator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

A valid Ethereum address is exactly 42 characters long: the two-character "0x" prefix followed by 40 hexadecimal digits. Those 40 hex digits encode 20 bytes, or 160 bits, of data, which is why the validator shows all three figures side by side. The hex digits must be 0-9 and a-f only; any other character makes the address invalid. If your string is shorter or longer than 42 characters, something was truncated or padded, and the tool reports the exact length it found so you can spot the problem fast. Keep in mind that "valid" here means correctly formatted, not necessarily an address that has ever held funds or appeared on-chain. Paste your address above and the validator instantly confirms the length, prefix, and characters before you trust it with a transaction.

Ethereum addresses are case-insensitive at the protocol level, so an all-lowercase, all-uppercase, or mixed-case version of the same 40 hex digits all point to the identical account. The mixed-case form you often see is EIP-55, which deliberately uppercases certain letters to embed a built-in checksum. The address is hashed with Keccak-256, and each letter is capitalized when its matching hash nibble is 8 or higher; otherwise it stays lowercase. That casing pattern lets wallets detect typos without changing where funds go. Some block explorers and databases still store addresses in plain lowercase, which is equally valid. This tool gives you both forms from one input: the canonical EIP-55 checksum version and the normalized lowercase version, each with a one-click copy button. Paste an address above to see exactly how the two representations line up.

Paste the all-lowercase address into the validator and click Validate. The tool lowercases and hashes the 40 hex digits with Keccak-256, then walks through each character: digits are left alone, while letters are uppercased whenever the corresponding nibble of the hash is 8 or greater. The output is the canonical EIP-55 checksum address, such as 0x742d35Cc6634C0532925a3b8D4C9C8E55f3bC5e3, ready to copy with one click. You do not need to install a library, run a script, or trust a remote server, because the Keccak-256 calculation happens entirely in your browser. This is useful when a tool or contract rejects a plain lowercase address, or when you simply want the typo-resistant form before sharing it. Paste your lowercase address above to get the checksummed version instantly, alongside the raw bytes and an Etherscan link.

No. The validator only checks an address's structure and casing; it never queries the blockchain, so it cannot tell you a balance, a transaction count, or whether anyone controls the address. A string can be perfectly valid in format yet have zero history and no owner, which is exactly what the "Generate Random" demo button produces. To see real on-chain data, the tool gives you direct "View on Etherscan" and "Token Transactions" links that open the address page where balances, tokens, and history are listed. That separation is intentional: formatting checks stay private and offline in your browser, while live lookups happen on Etherscan only when you click. Validate your address here first to rule out typos, then follow the Etherscan link to confirm balances and activity before sending funds.

When an address validates, the tool breaks it into its 20 underlying bytes and displays them as space-separated hexadecimal pairs. An Ethereum address is really just those 20 bytes (160 bits) of binary data; the familiar 0x text is simply a hex encoding of them. Seeing the byte-level view is handy when you are debugging encoding issues, inspecting ABI-encoded calldata, or comparing how an address is packed into a smart-contract argument, where addresses are often left-padded to 32 bytes. It also helps confirm that two representations truly match, since the bytes are identical regardless of capitalization. Most casual users never need this view, but for developers it removes the guesswork of manually splitting a 40-character string. Paste an address above to validate it and reveal the checksum form, lowercase form, and the raw 20-byte breakdown together.