Hex to Python Integer Converter
Convert a hex value into a Python int literal (0x..., lowercase), ready to paste directly into Python source code.
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 Python Represents Hex Literals
Python accepts a hex literal anywhere an integer is expected, written as 0x followed by hex digits — no separate parsing step needed. Since Python integers are arbitrary precision, there's no fixed-width type to choose, unlike C, Java, or Rust.
Python Hex Conventions at a Glance
| Hex value | Python literal | Notes |
|---|---|---|
| FF | 0xff | int() also works: int("ff", 16) |
| 1234ABCD | 0x1234abcd | case-insensitive, both directions |
| 0 | 0x0 | same as plain 0 |
| FFFFFFFFFFFFFFFF | 0xffffffffffffffff | no overflow — arbitrary precision |
Where Hex to Python Integer Actually Comes Up
Pasting a Color or Bitmask Constant Into Code
Copying a hex color value or a flag bitmask from a design tool or spec document straight into Python source code as a readable, correctly-formatted literal.
0x2563EB as a Python color constant
Writing a Test Case With a Known Hex Value
Unit tests that check parsing or encoding logic often need a specific hex value hardcoded as an int literal for comparison against a function's output.
assert parse_id(data) == 0xdeadbeef
Converting a Value From a Hex Dump for Debugging
When inspecting raw bytes in a debugger or hex editor, converting the relevant value to a Python literal makes it easy to paste into a REPL session for further inspection.
hex dump value -> paste into Python REPL
Why Use This Calculator Instead of Doing It by Hand
- Matches Python's own hex() output style (lowercase) exactly
- Handles values of any length, since Python ints have no fixed-width limit
- Runs entirely in your browser — nothing you type gets sent anywhere
- Saves manually adding the 0x prefix and fixing letter case
Limitations
- Outputs a positive literal only — for a negative Python int, prefix the result with a minus sign yourself (Python doesn't use two's complement for hex literals).
- Doesn't insert Python's optional underscore digit separators (like 0xFF_FF) — the output is a plain, ungrouped literal.
Frequently Asked Questions
Does Python accept both uppercase and lowercase hex literals?
Yes — 0xFF and 0xff are both valid and equal in Python. This converter outputs lowercase digits to match the style Python's own built-in hex() function produces.
Is there a size limit on Python integers?
No — Python's int type is arbitrary precision, so there's no overflow the way there is in fixed-width languages like C or Java. A hex literal of any length is a valid Python int.
How do I convert a hex string variable to an int in Python, not just a literal?
Use int(hex_string, 16) — for example int("ff", 16) returns 255. That's the runtime equivalent of typing the 0xff literal directly in source code.
Can I use underscores in a Python hex literal for readability?
Yes — Python allows underscores as digit separators in numeric literals, like 0xFF_FF_FF, though this converter doesn't insert them automatically.
What does Python's hex() function return for negative numbers?
A minus sign followed by the hex digits, like "-0xff" — Python doesn't use two's complement for its arbitrary-precision integers the way fixed-width languages do.