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Ethereum ToolsetEthereum Toolset
Developer Tools

Utilities for serious Ethereum builders

Small tools that save hours. Encode calldata, generate Merkle proofs, hash inputs, and inspect transactions — all in the browser.

Encoding

ABI Encoder

Encoding

Encode function calls into calldata.

ABI Decoder

Encoding

Decode raw ABI-encoded values into typed output.

Event Decoder

Encoding

Decode logs by topic and event signature.

Calldata Decoder

Encoding

Break down transaction input data into function and args.

Hashing

Function Selector

Hashing

Compute the 4-byte function selector for any signature.

Keccak-256 Hash

Hashing

Compute Keccak-256 of any UTF-8 or hex input.

SHA-256 Hash

Hashing

SHA-256 digest for content verification.

Utilities

Address Validator

Utilities

Check checksum and produce EIP-55 casing.

Timestamp Converter

Utilities

Unix ↔ ISO ↔ human dates.

Gas Estimator

Utilities

Estimate USD cost for common on-chain actions.

Math

Unit Converter

Math

Wei ↔ Gwei ↔ Ether with full precision.

CREATE2 Calculator

Math

Predict a contract address before deploying.

Merkle

Merkle Tree Generator

Merkle

Build a Merkle tree from a list of leaves.

Merkle Proof Generator

Merkle

Produce an inclusion proof for one leaf.