Hex to Decimal Converter Online
Convert between hexadecimal and decimal number systems instantly in your browser. This free tool processes everything client-side, so your data stays private.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Results update as you type.
About Number Base Conversion
- Supports arbitrarily large numbers using BigInt — no precision loss.
- Use prefixes for quick input:
0bfor binary,0ofor octal,0xfor hex. - Underscores in input are ignored for readability (e.g.
1_000_000). - Everything runs in your browser — no data is sent over the network.
What is hexadecimal to decimal conversion?
Hexadecimal (base-16) uses digits 0-9 and letters A-F (where A=10, B=11, C=12, D=13, E=14, F=15). Converting hex to decimal multiplies each digit by 16 raised to its position power. For example, hex 1A3 equals (1×256) + (10×16) + (3×1) = 419 in decimal. Hex is compact and aligns naturally with binary (each hex digit = 4 bits).
Common use cases for hex-decimal conversion
Hex to decimal conversion is used in web development for CSS color values (#FF5733 = rgb(255, 87, 51)), memory address interpretation, Unicode code point analysis, MAC address parsing, and reading hexadecimal dumps. It is also essential for low-level debugging and understanding byte-level data representations.
Frequently Asked Questions
How are hex color codes converted to RGB values?
A hex color like #FF5733 is split into three pairs: FF, 57, 33. Each pair is converted from hex to decimal: FF=255, 57=87, 33=51. This gives the RGB value rgb(255, 87, 51).
Is hexadecimal case-sensitive?
No. Hexadecimal digits A-F can be written in uppercase or lowercase — 0xFF and 0xff represent the same value (255 in decimal). Convention varies by context: CSS colors typically use lowercase, while memory addresses often use uppercase.