Hexadecimal 0-255 Converter
Enter any byte value (0-255, in hex, decimal, binary, or octal) and see its full breakdown in every base at once.
Detected as Hexadecimal — 8-bit width, 1 byte
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: ASCII — Wikipedia
How This Converter Works
Type a value in any common base — the converter detects whether you've entered hex, decimal, binary, or octal based on the prefix and characters, then shows the same value represented in every base at once, along with its signed reading and set/clear bit count.
Where This Actually Comes Up
Checking Every Base Reading for One Byte at Once
Instead of running a value through separate hex-to-decimal and hex-to-binary converters, getting every representation in a single view.
one input -> hex, decimal, binary, octal, signed
Verifying a Value Regardless of How It Was Typed
Pasting a value in whatever format you happen to have it in (hex, binary, decimal) without first converting it yourself.
paste 0b10100101 directly, no pre-conversion needed
Quickly Judging a Byte's Bit Density
Checking the set/clear bit count to get a fast sense of how many flags or bits are active in a byte, without counting manually.
0xA5 -> 4 bits set, 4 bits clear
Why Use This Calculator Instead of Doing It by Hand
- Auto-detects the input base instead of requiring you to specify it
- Shows every representation (hex, decimal, binary, octal, signed) at once
- Runs entirely in your browser — nothing you type gets sent anywhere
- Works beyond one byte too, with a selectable bit width
Limitations
- Auto-detection picks the most likely base from the input format — an ambiguous plain-digit string (like "10") is read as decimal by default; use an explicit prefix if you mean a different base.
Frequently Asked Questions
What formats can I type in?
Hex (with or without 0x), decimal, binary (0b prefix), or octal (0o prefix) — the converter automatically detects which base you typed based on the prefix and characters used.
Why does it show both signed and unsigned decimal?
A byte's bit pattern can be read two ways — as an unsigned value (0-255) or as a signed value (-128 to 127) depending on context, so both readings are shown together rather than picking one.
What does "set / clear bits" mean?
How many of the 8 bits are 1 (set) versus 0 (clear) — useful for quickly gauging how "full" a byte's bit pattern is without counting manually.
Can I use this for values larger than one byte?
Yes — this converter isn't limited to 0-255; select a wider bit width (16/32/64-bit) if you're inspecting a larger value.