Int to Hex in C#

Reverse Conversion Tool: Hex to Int in C#

Learn how to convert integers (int) to hexadecimal (hex) in C# using simple and effective methods. Whether you’re building software for embedded systems, game development, or working with memory-level programming, converting integers to hexadecimal is a fundamental task.

Why Convert Integers to Hexadecimal?

Hexadecimal values are compact and easier to read than binary, especially for large numbers. Converting integers to hex is useful in:

Debugging low-level code
Addressing memory locations
Networking and protocol design
Digital electronics

If you’re working with base conversions beyond C#, try our Decimal to Hex Converter for instant results.

Method 1: Using `ToString("X")` in C#

The simplest way to convert an int to hex in C# is by using the ToString() method with the format specifier "X".

int number = 255;
string hex = number.ToString("X");
Console.WriteLine(hex); // Output: FF

Explanation:

"X" gives uppercase hex (A–F)
Use "x" for lowercase (a–f)

Need to verify your hex output? Use our Hex to Decimal Converter for quick cross-checks.

Method 2: Using `Convert.ToString()`

For educational or debugging purposes, you can also convert to binary or hex manually using Convert.ToString():

int value = 1234;
string hex = Convert.ToString(value, 16);
Console.WriteLine(hex); // Output: 4d2

"16" indicates base-16 (hex)
Use "2" for binary.

Method 3: With `BitConverter` (for byte arrays)

If you’re working with byte arrays or memory blocks:

int value = 4660; // 0x1234
byte[] bytes = BitConverter.GetBytes(value);
string hex = BitConverter.ToString(bytes).Replace("-", "");
Console.WriteLine(hex); // Output (little endian): 34120000

⚠️ Note: This method is platform-dependent (endian-ness matters).
To interpret byte values, try our Little Endian Hex to Decimal Converter.

Related Converters on HexCalculator.org

If you’re working with various numeric formats in C# or other languages, these converters may help:

Decimal to Hex Converter – Instant conversion from int to hex
Hex to Decimal Converter – Verify hex results
Binary to Hex Converter – Useful when converting int to binary first
Hex Bitwise Calculator – Perform AND, OR, XOR operations on hex values
Hex Modulo Calculator – For division/modulo in hex logic

FAQs – Int to Hex in C#

Q1: Can I convert negative integers to hex in C#?

Yes, C# uses two’s complement to represent negative numbers in binary and hexadecimal.

Explore this using our Hex Two’s Complement Calculator.

Q2: What’s the best method for formatting hex with leading zeros?

Use padding:

int value = 255;
string hex = value.ToString("X4"); // Output: 00FF

Q3: How do I convert `int` to a color hex code (like #FF0000)?

Just use RGB values:

int r = 255, g = 0, b = 0;
string hex = $"#{r:X2}{g:X2}{b:X2}";
Console.WriteLine(hex); // Output: #FF0000

Try our RGB to Hex Color Converter for visuals.

Final Thoughts

Converting integers to hex in C# is fast, flexible, and essential in many programming environments. By mastering simple methods like ToString("X") or Convert.ToString(), you can work more efficiently with memory, color codes, hardware-level programming, and binary arithmetic.