Hex to Go Integer Converter
Convert a hex value into a Go integer literal — 0x-prefixed, defaulting to Go's platform-sized int unless you specify a fixed-width type.
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 Go Represents Hex Literals
A bare 0x-prefixed value is an untyped constant in Go, which takes on whatever integer type its context requires — assigning it to a variable declared as uint8, int32, or similar picks the type without needing a suffix on the literal itself.
Where Hex to Go Integer Actually Comes Up
Defining a Flag or Bitmask Constant
Pasting a hex bitmask from a spec directly into a Go const declaration, letting Go's untyped constant system handle the type when the constant is used.
const Mask = 0xFF00FF00
Initializing a Fixed-Width Type
Writing a hex literal for a variable declared with an explicit Go integer type, relying on the declaration for the width rather than a literal suffix.
var flags uint8 = 0xFF
Working With Networking or Protocol Constants
Go's standard library and many networking packages use hex constants for protocol magic numbers and flags — converting a documented value into the correct literal form.
const MagicNumber = 0xCAFEBABE
Why Use This Calculator Instead of Doing It by Hand
- Produces a syntactically valid Go hex literal instantly
- Runs entirely in your browser — nothing you type gets sent anywhere
- Saves manually adding the 0x prefix and fixing letter case
- No suffix rules to remember, since Go infers the type from context
Limitations
- Doesn't check whether the value fits your intended Go type (uint8, int16, etc.) — Go's compiler will catch an overflow, but this calculator doesn't check it in advance.
- Doesn't insert Go 1.13+ underscore digit separators (like 0xDEAD_BEEF) — the output is a plain, ungrouped literal.
Frequently Asked Questions
Does Go accept 0x hex literals directly?
Yes — 0xFF is a valid Go integer literal. Go also accepts 0X as the prefix and underscores as digit separators.
What type does a Go hex literal get by default?
An untyped constant, which Go converts to int (or whatever type the context requires) when it's used — you don't need a suffix, but you do need to declare the variable's type explicitly if you want something other than int.
How do I write a hex literal for a specific fixed-width type?
Declare the variable with the type you want and assign the literal directly — var flags uint8 = 0xFF — Go infers the literal's type from the declaration rather than using a suffix on the literal itself.
Can I use underscores in a Go hex literal?
Yes — since Go 1.13, you can write 0xDEAD_BEEF using underscores as separators for readability, equivalent to 0xDEADBEEF.