What is the EIP-55 checksum?

EIP-55 is a mixed-case checksum scheme for Ethereum addresses. The hash of the lowercase address (via keccak256) determines which hex letters are uppercased. If even one character is mistyped, the checksum fails.

Does this tool check the balance or activity of an address?

No. It only validates format and checksum. To inspect balances you'd need to query a node or block explorer, which requires a network call — this tool is 100% offline.

Is my address sent anywhere?

Never. The keccak256 hash is computed locally in JavaScript. No network request is made. You can verify this with DevTools → Network.

Why does my address show as 'checksum not present'?

If your address is all-lowercase or all-uppercase, it carries no checksum information. The format is still valid — many wallets and exchanges accept all-lowercase addresses. We recommend using the checksummed form whenever possible.

Can I validate contract addresses too?

Yes. Contracts and EOAs use the same address format and the same EIP-55 checksum. This tool can't tell them apart — that distinction requires querying the chain.

Which address formats are supported?

20-byte hex addresses with the 0x prefix (Ethereum mainnet, L2s like Arbitrum, Optimism, Polygon, BSC, etc.). ICAP-style addresses (starting with XE) are not supported.

Ethereum Address Validator

Validate ETH addresses with full EIP-55 checksum verification — 100% in your browser.

100% private — no uploads Free & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Ethereum Address Validator

Follow these steps — everything happens instantly in your browser.

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Step 1. Paste an Ethereum address into the input field (0x followed by 40 hex characters).
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Step 2. The validator runs instantly and shows basic format, network type, and checksum status.
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Step 3. Read the green/red result — green means the checksum matches, red means it fails or the format is wrong.
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Step 4. Use “Copy checksummed” to get the properly-cased EIP-55 version of the address.

Why use this tool

Frequently asked questions

Everything you might want to know about ethereum address validator.

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