Binary converter

Convert whole numbers between bases.

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Binary converter processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Your input

Input base

Options and local file

Output base

Open a text file on this device

Optional settings apply only to this tab.

Your result

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Updated 2026-09-20

Binary converter explained

Convert a signed whole number without rounding it through a floating-point value. Bases from binary through base 36 use the digits 0–9 and letters A–Z; the chosen input base determines which digits are valid.

A worked example

Decimal 255 equals binary 11111111 and hexadecimal FF. A minus sign represents a negative number, not a fixed-width two’s-complement bit pattern.

Before you use the result

Whole numbers only. Do not include a 0x or 0b prefix. Leading zeros are removed; fractions and fixed-width signed representations are not part of this conversion.

Next: Binary translator

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ToolOctopus. “Binary converter.” Updated 2026-09-20. https://tooloctopus.com/number-base-converter.

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