Int to Hex in C# Converter
Convert a C# int to its hexadecimal string form — the same output value.ToString("X") returns, shown with both uppercase and lowercase formatting.
Built by
Swapnil SanghviFull-Stack Web Developer & WordPress Developer
Swapnil Sanghvi is a full-stack web and WordPress developer, UI designer, and full-time freelancer who builds and maintains Hex Calculator.
Further reading: hex — Stack Overflow
How C# Converts an Int to Hex
Calling ToString("X") on an int converts it to base 16 using uppercase digits, with no 0x prefix and no padding by default — add a digit count (like "X8") to the format string for fixed-width, zero-padded output.
Where Int to Hex in C# Actually Comes Up
Formatting a Color Value for Display
Converting an ARGB color int to its hex string form for logging, UI display, or exporting to a format that expects hex color codes.
color.ToString("X8")
Logging a Computed Value in Hex
Converting a bitmask, hash, or error code to hex before logging it, since hex is often easier to cross-reference against documentation than decimal.
Console.WriteLine($"0x{value:X}")
Building a Hex-Encoded Identifier String
Converting a numeric ID to a fixed-width hex string, useful for generating compact, sortable identifiers.
id.ToString("X8") -> fixed-width hex ID
Why Use This Calculator Instead of Doing It by Hand
- Matches the digit output of C#'s ToString("X") format specifier
- Runs entirely in your browser — nothing you type gets sent anywhere
- Saves manually converting and formatting the output
- Useful for checking expected output before writing test assertions
Limitations
- Adds a 0x prefix — C#'s ToString("X") doesn't include one, so drop it if you're matching that output exactly.
- Doesn't zero-pad to a fixed width — add the digit count yourself in your format string (like "X8") if you need that.
Frequently Asked Questions
How do I convert an int to hex in C#?
Call value.ToString("X") for uppercase hex digits, or "x" for lowercase — for example, 255.ToString("X") returns "FF".
How do I pad the result to a fixed width?
Add a digit count to the format string, like value.ToString("X8") to pad to 8 digits with leading zeros — useful for consistently formatted 32-bit values.
Does ToString("X") add the 0x prefix?
No — it returns just the digits. Prepend "0x" yourself if you need the literal-style prefix in the output string.
How do I convert a hex string back to an int at runtime?
Use Convert.ToInt32(hexString, 16) — the counterpart to ToString("X") for parsing a hex string into an int.