What does Number Base Converter actually do?

The number-base converter prints the same integer in binary, octal, decimal, and hexadecimal. It does not convert floats reliably, and it does not decode arbitrary hex dumps of text — that is the hex tool.

When should I use Number Base Converter?

Use it for a bitmask, a color channel, or a permission bit you already treat as an integer.

When should I not use Number Base Converter?

Do not paste a multi-byte hex dump and expect text out.

What does Number Base Converter not do?

Integer values. Not a byte-string decoder. Very large inputs are limited by JavaScript number or BigInt handling in the tool.

Number Base Converter

Convert numbers between binary, octal, decimal, and hex. Free online — runs locally, no upload.

Binary (base 2)

Octal (base 8)

Decimal (base 10)

Hexadecimal (base 16)

Supports arbitrarily large integers (Bigint). Type in any field — all other bases update instantly.

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Number Base Converter