Can it handle numbers larger than 64 bits?

Yes. The conversion uses arbitrary-precision integers, so a 300-digit value converts exactly. Many converters silently lose precision past 9007199254740991 because they use floating point numbers; this one does not.

What does bit length mean?

It is how many binary digits the number needs, ignoring leading zeros. 255 needs 8 bits, 256 needs 9. Zero is reported as 0 bits. It tells you at a glance whether a value still fits in a byte, a 16-bit word and so on.

Why does the Unicode character box sometimes stay empty?

Not every number is a printable character. Values above 1114111 are outside Unicode, the range 55296-57343 is reserved for surrogate halves, and control codes such as 10 or 27 have no visible shape. In those cases the box says so instead of showing an empty square.

Is the number I type sent to a server?

No. The whole conversion runs in your browser, so nothing leaves the page. You can even disconnect from the network and the tool keeps working.

Binary, Hex and Decimal Converter - Convert Between Number Bases

Tools / Dev Tools / Binary / Hex / Decimal

Number base converter

Input format

Spaces, underscores and 0x / 0b / 0o prefixes are ignored, so you can paste values straight from code. A leading minus sign is allowed.

Decimal

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Binary

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Octal

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Hexadecimal

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Unicode character

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Bit length

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Frequently Asked Questions

Pick Decimal as the input format, type the number, and read the Binary box. Every box updates as you type, so you also get octal, hexadecimal and the bit length in the same pass.

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