Hex to Int in C# Converter
Convert a hex value into a C# integer literal — 0x-prefixed, with the same u/l suffix conventions C# shares with C-family languages.
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# Represents Hex Literals
A bare 0x-prefixed value is a valid C# int literal directly — no suffix is needed unless the value exceeds int's 32-bit signed range, in which case a u, l, or ul suffix selects the appropriate wider or unsigned type.
Where Hex to Int in C# Actually Comes Up
Defining a Color or Flag Constant
Pasting a hex color value or bitmask flag from a design spec directly into C# source as a readable, correctly-formatted int literal.
const int Color = 0x2563EB;
Writing a Unit Test With a Known Hex Value
Hardcoding an expected hex value as a C# literal for comparison against a method's output in a test assertion.
Assert.AreEqual(0xDEADBEEF, result);
Working With Windows API Flag Constants
Many Windows API and P/Invoke declarations use hex flag values from Microsoft documentation — converting them to proper C# literals when porting the constants into C# code.
const uint FLAG = 0x00000010;
Why Use This Calculator Instead of Doing It by Hand
- Produces a syntactically valid C# hex literal instantly
- Runs entirely in your browser — nothing you type gets sent anywhere
- Saves manually adding the 0x prefix and fixing letter case
- Straightforward to extend with a u/l suffix yourself if the value needs it
Limitations
- Doesn't add a u/l/ul suffix automatically — add one yourself if the value exceeds a plain int's 32-bit signed range.
- Doesn't insert C# 7.0+ digit separators (like 0xDEAD_BEEF) — the output is a plain, ungrouped literal.
Frequently Asked Questions
How does C# write hex literals?
The same 0x prefix as C and C++ — 0xFF is a valid C# int literal. C# also supports the 0b binary prefix and digit separators (underscores) if you need them.
What suffixes does C# support?
u (uint), l (long), ul or lu (ulong) — similar in spirit to C's suffixes, though C#'s int is always exactly 32-bit and long is always exactly 64-bit, unlike C where those sizes can vary by platform.
Can I use Convert.ToInt32 instead of a literal?
Yes — Convert.ToInt32("FF", 16) parses a hex string at runtime into an int, which is what you'd use for a value that isn't known until the program runs, rather than a literal baked into source code.
Does C# support digit separators in hex literals?
Yes — since C# 7.0, you can write 0xDEAD_BEEF using underscores as separators for readability, equivalent to 0xDEADBEEF.