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§ · free tool
Number base converter. Binary, hex, octal, decimal, live.
Type a number in any field and the other three update instantly, with full BigInt precision for arbitrarily large integers. Everything runs in your browser, nothing is uploaded.
A free online tool by Digital Heroes§ 01 · the tool
base 10
base 16 · 0-9 a-f
base 8 · 0-7
base 2 · 0-1
binary, grouped in nibbles (4 bits)
Enter a value above.
Runs entirely in your browser, nothing is uploaded. Conversion uses BigInt, so arbitrarily large integers are exact.
§ 02 · what you can do
Everything a converter should do.
- Convert decimal to binary, hex or octal instantly as you type in any field.
- Convert hex to binary or decimal for low-level debugging, colour codes and protocol work.
- Read nibble-grouped binary in tidy 4-bit chunks with alternating colours for quick scanning.
- See bit length and byte length of any value at a glance in the stats bar.
- Handle negative numbers with a leading minus sign, shown in sign-magnitude form.
- Work with huge integers: BigInt means no overflow and no precision loss, ever.
§ 03 · how to use it
Four steps, no manual.
- Type or paste a number into any of the four fields, decimal, hex, octal or binary.
- The other three fields update live the moment you type; invalid digits flag the field instead of guessing.
- Check the stats bar for bit length, byte length and sign, and read the nibble-grouped binary below.
- Click the copy button on any field, or Copy on the nibble display, to grab your result.
§ 04 · faq
Frequently asked questions.
Is the Number Base Converter free?
Yes, completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is my data uploaded anywhere?
No upload, ever. Every conversion runs in your browser on your own device, the numbers you type never leave your computer and nothing is sent to a server.
Can it handle very large numbers?
Yes. Conversion uses JavaScript's BigInt, so there is no 64-bit overflow and no floating-point rounding, arbitrarily large integers convert exactly across every base.
Does it support negative numbers and fractions?
Negative integers are supported with a leading minus sign, shown in sign-magnitude form, the nibble grouping reflects the absolute value. Fractional (non-integer) values aren't converted; this tool works on whole numbers.
What are nibbles and why group binary that way?
A nibble is 4 bits, which maps to exactly one hex digit. Grouping binary into nibbles makes long bit strings far easier to read and to line up against their hexadecimal equivalent.
Published · Last updated .
