How to use it
Pick the input base
Choose Hex, Decimal or Binary to match the value you already have.
Type your value
The other two bases appear instantly as you type, with hex kept uppercase.
Copy what you need
Use the Copy button next to any row to grab that representation.
About the hex converter
Hexadecimal is the everyday shorthand of computing: CSS colours, memory addresses, MAC addresses, error codes and bitmasks all lean on base 16 because every hex digit maps cleanly to four binary bits. This converter keeps all three views side by side, so you can sanity-check a flag register, decode a colour channel or translate a file offset without doing the maths by hand. Values larger than 2^53 are converted exactly using big-integer arithmetic, and nothing is uploaded — the conversion happens entirely in your browser.
Reference: 0–15 in each base
Questions
Is anything uploaded?
No. The conversion runs entirely in your browser — nothing you type leaves your device, and the page works offline once loaded.
How large can the numbers be?
Values up to 2^53 use standard JavaScript maths. Anything larger is converted exactly with big-integer arithmetic in modern browsers, so 64-bit addresses and long hashes stay precise. You can enter up to 130 digits.
Does it handle negative numbers or fractions?
It converts whole, non-negative values, which covers the common cases: colour codes, offsets, permissions and bitmasks. Prefixes like 0x and 0b are accepted and ignored automatically.