Why checksums matter
An EVM address is just 20 bytes of hex — case doesn’t technically change its value. EIP-55 exploits that by encoding a checksum into the capitalization: each hex character is uppercased or lowercased based on a hash of the address itself. Wallets and explorers that support EIP-55 can then flag an address whose casing doesn’t match its hash — catching a typo or a corrupted copy-paste before you send funds into the void.
What this tool checks
Paste any address and it’s validated in three stages: is it the right shape (0x followed by 40 hex characters); does its casing assert a checksum at all (all-lowercase and all-uppercase addresses assert none); and if it does, does that checksum actually match. You always get the correct checksummed form back, regardless of how the input was cased, along with a QR code you can scan or download.
One format, every EVM chain
Because Ethereum, BNB Chain, Base, Arbitrum, Polygon, and every other EVM-compatible chain share the same address format, this tool works identically no matter which chain the address belongs to — there’s no chain selector because none is needed.