Tools
Unit & Hex Converter
Convert wei, gwei, and ether, flip hex and decimal, hash with keccak256, and checksum addresses.
The Unit & Hex Converter is a set of small, exact utilities for everyday on-chain math. It handles arbitrary-precision integers with no floating-point rounding, and it never makes a network request.
What it does
Four tabs:
- Units: three linked fields for wei, gwei, and ether. Type in any one and the others update live. Values are exact big integers, so very large numbers convert without rounding. Each field has a copy button.
- Hex ↔ Decimal: two linked fields converting between hex (with or without
0x, any case) and arbitrary-precision decimal. Invalid or negative input is rejected gracefully. - Keccak-256: hash text or hex bytes with keccak256. Toggle between UTF-8 text and Hex bytes input; the hash updates live and is copyable.
- Checksum: enter an address to see whether it is valid, its EIP-55 checksummed form, and its lowercase form. Invalid input explains why (wrong length, bad characters, or a failed checksum).
Step by step
- Pick a tab for the conversion you need.
- Type into any input; results update instantly.
- Copy the value you want.
Fees and gas
Free. Nothing here touches the chain.
Limits and safety
- All math uses big integers, so results are exact, with no silent rounding on large values.
- This tool never makes a network request; every conversion is local.