Free Decimal to Hex Converter – Convert Decimal to Hexadecimal
Convert decimal numbers to hexadecimal instantly. Supports large numbers. Choose uppercase or lowercase output. 100% free, browser-based.
What Is Decimal to Hex Conversion?
Decimal to hexadecimal conversion transforms base-10 numbers into base-16 representation. This is essential for programming, web development, and working with binary data.
How to Use This Tool
Step 1: Enter Decimal
Type a decimal number (e.g., 255)
Step 2: Choose Case
Select uppercase (A-F) or lowercase (a-f)
Step 3: View & Copy
See hex result and copy to clipboard
Conversion Examples
| Decimal | Hexadecimal | Common Use |
|---|---|---|
| 0 | 0 | Zero value |
| 10 | A | First letter digit |
| 15 | F | Max single digit |
| 16 | 10 | First two-digit |
| 255 | FF | Max byte value |
| 256 | 100 | 1 byte + 1 |
| 65535 | FFFF | Max 16-bit |
| 16777215 | FFFFFF | CSS white |
Understanding the Conversion
Division Method
- Divide number by 16
- Record the remainder
- Repeat with quotient
- Read remainders in reverse
Example: 255 to hex
- 255 ÷ 16 = 15 remainder 15 (F)
- 15 ÷ 16 = 0 remainder 15 (F)
- Result: FF
Hex Digit Values
Decimal: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Hex: 0 1 2 3 4 5 6 7 8 9 A B C D E F
Common Uses
CSS Colors
color: #FF5733; /* 255,87,51 in RGB */
background: #000000; /* Black */
Programming
const buffer = Buffer.from([0xFF, 0x00, 0xAB]);
const address = 0xDEADBEEF;
Memory Addresses
0x00000000 - Start of memory
0xFFFFFFFF - End of 32-bit address space
Case Options
| Style | Example | Use Case |
|---|---|---|
| Uppercase | 0xFF | Most common, easier to read |
| Lowercase | 0xff | Some APIs prefer this |
Technical Details
Large Number Support
Uses JavaScript BigInt for numbers larger than 2^53-1.
Output Format
Result is shown with 0x prefix for clarity.
Frequently Asked Questions
Can I convert negative numbers?
The tool shows the unsigned representation.
What's the maximum value?
No practical limit due to BigInt support.
Is my data secure?
Yes. All processing is browser-based.
Related Tools
- Hex to Decimal — Reverse conversion
- Decimal to Binary — Binary output
- RGB to Hex — Color conversion
- Binary to Decimal — Binary converter
Enter a decimal number above to convert to hexadecimal.