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Function Selector

Compute the 4-byte Ethereum function selector (keccak256 signature).

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Function Selector

Function selector

Function signature

4-byte selector

0xa9059cbb

About this tool

Selector = first 4 bytes of keccak256 of the canonical signature. Useful when reading raw calldata or verifying custom errors.

All computation happens locally in your browser. No inputs are sent to a server.

Related

Keccak-256 Hash

Compute Keccak-256 hashes used across Ethereum and Solidity.

SHA-256 digest for content verification.

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