Hex to Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal — arbitrary size, entirely in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the number base converter with hexadecimal (base 16) as the source and decimal (base 10) as the target — paste a hex value, lowercase or uppercase, and run it.
Hexadecimal uses sixteen digits, 0–9 then a–f, and each position is a power of 16. So ff means 15 × 16 + 15 = 255, and 1a3 means 1 × 256 + 10 × 16 + 3 = 419.
Beyond this pair, the full tool converts between binary, octal, decimal and hex in any direction, with a breakdown in all four bases and no length limit. Everything is computed locally — your values never leave the browser.
Example. Decimal 255 converts to hexadecimal ff, binary 11111111, and octal 377.
Limit. The only bases are 2, 8, 10, and 16, and a digit that does not belong in the source base is rejected.