EIP-55 Checksum Tool — Checksum Ethereum Addresses, Catch Typos
Convert any Ethereum address to its canonical EIP-55 checksummed form. Detect typos before sending funds.
Your input differs from the canonical checksum — if you got this from another tool, the typo guard would have flagged it.
How to use
- 1 Paste any Ethereum address — lower, upper, or mixed case.
- 2 Output is the canonical EIP-55 checksummed form.
- 3 Mixed-case letters encode a keccak-256 hash of the lowercase address — letters with hash nibble ≥ 8 are uppercased.
Why use this tool
- EIP-55 turns a case-insensitive 40-char hex address into a typo-catching checksum.
- Most wallets (MetaMask, Ledger Live, etc.) emit checksummed addresses — pasting one back will be flagged if a character is wrong.
- Useful for safely converting addresses scraped from logs or older systems that emit lowercase only.
- Runs entirely in your browser — keccak-256 computed locally.
Frequently asked questions
Is the checksummed address a different address?
No — it points to the exact same account on-chain. Ethereum addresses are case-insensitive at the protocol level. The checksum is purely a client-side typo guard.
What if my input is wrong?
If the input has 40 valid hex chars in any case, this tool will produce the canonical checksum. To check if a mixed-case address is itself valid EIP-55, use the Wallet Address Validator.
Why was EIP-55 introduced?
Without checksums, a single typo in a 40-char hex address would result in sending funds to a different (likely dead) account. EIP-55 (Vitalik Buterin & Alex Van de Sande, 2016) added detection without changing the address format.
What is EIP-55 Checksum Tool?
An EIP-55 Checksum Tool is a tool that converts an Ethereum address into its canonical EIP-55 checksummed form, where specific letters are capitalized based on the address hash. This mixed-case encoding lets wallets detect typos before funds are sent. The conversion runs entirely client-side in the browser, so the address is never transmitted to a server.
EIP-55 Checksum Tool is a free web3 utility by Zerethon Tools. Convert any Ethereum address to its canonical EIP-55 checksummed form. Detect typos before sending funds. Runs entirely in the browser — no signup, no upload.
- Category
- Web3
- Pricing
- Free
- Privacy
- Browser-based
- Signup
- Not required
Privacy
Your data never leaves your browser unless explicitly stated. EIP-55 Checksum Tool runs entirely client-side — no server upload, no logging, no tracking of your input.
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