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KioTools
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Decimal to Hex Converter

What is this tool?

A focused, single-purpose converter between base-10 (decimal) and base-16 (hexadecimal) numbers, built on exact BigInt math so it stays accurate even for very large numbers. Type a value, tap the swap arrow to flip direction, and read the result instantly.

When to use it

  • Converting a decimal number to hex for color codes, memory addresses or programming
  • Converting a hex value (like a color code or hash fragment) back to a readable decimal number
  • Checking a hex/decimal homework or exam answer
  • Working with low-level programming, debugging or networking values

How to use it

  1. 1Type a decimal number into the input field
  2. 2Read the hexadecimal equivalent instantly in the result card
  3. 3Tap the swap arrow to flip the conversion to hex → decimal instead
  4. 4Use the copy icon to copy the result

Frequently asked questions

What is 255 in hex?

Decimal 255 equals hex ff.

Is the hex output upper or lower case?

Lower case (e.g. ff, not FF) — a common convention in programming contexts.

Can I convert hex to decimal here too?

Yes — tap the swap arrow next to the input to flip the direction.

Does this tool need an internet connection after loading?

No, the conversion runs entirely in your browser.