Hex ↔ Decimal Converter

Hexadecimal (base-16) is the standard number format in blockchain development. Ethereum transaction values, block numbers, token balances, and calldata are all represented as hex strings. This converter translates hex to decimal and decimal to hex, using BigInt arithmetic to handle the very large numbers common in crypto — Ethereum balances can be 78+ decimal digits long.

Enter a hex value (with or without the 0x prefix) to get its decimal equivalent, or enter a decimal number to get the hex representation. This is a constant need when reading block explorers, debugging smart contracts, or parsing raw transaction data.