THE TOOLBOXUseful by themselves.
Useful by themselves.
Better when understood.
Every tool works locally in your browser. No RPC keys, live-chain dependencies or wallet connection. Just your inputs and clear results.
EVERYDAY ESSENTIAL
↗Wei / Gwei / ETH
Convert units exactly. Every digit stays where it belongs.
DEVELOPER LAB
↗ABI encoder
Give a function its arguments. See the bytes come together.
DEVELOPER LAB
↗Calldata decoder
Separate the selector, inspect the words, follow the offsets.
CRYPTOGRAPHY
↗Keccak-256
Turn text or hex into an Ethereum-style fingerprint.
EVERYDAY ESSENTIAL
↗Address checker
Check the format. Get the EIP-55 checksum.
LEARN BY DOING
↗Gas calculator
Your gas inputs. A clear breakdown of the fee.
DEVELOPER LAB
↗Event decoder
Read Transfer topics and discover the raw token amount.
UNDER THE HOOD
↗Storage layout
Pack Solidity value types into little 32-byte drawers.
CRYPTOGRAPHY
↗Merkle trees
Build a tree. Select a leaf. Verify its proof.
DEVELOPER LAB
↗Revert decoder
Make sense of Error, Panic and custom error bytes.
Want to know why it works?
Every tool links to a lesson. Follow the bytes all the way back to the idea.
Explore the learning paths →