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Convert numbers between bases

Works offline · never uploaded 0 uses

Convert a number between binary, octal, decimal, and hexadecimal instantly in your browser.

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How it works

  1. 1

    Paste or enter the value you want to convert.

  2. 2

    Conversion happens instantly as you type.

  3. 3

    Review the result in the target format.

  4. 4

    Copy the result to your clipboard.

Why use this tool

Every dev utility, one place

Format, convert, encode, decode, and generate — no more juggling ten tabs.

100% private, always

Every tool runs in your browser — your code and data are never sent anywhere.

Works on any device

Runs on Windows, Mac, Linux, iOS, and Android — nothing to install.

Instant results

No queues, no build step — results update as you type.

Built to handle real data

Full Unicode support and RFC-compliant parsing, edge cases included.

Free, always

Free to use, with no rate limits, sign-up, or trial period.

Frequently asked questions

It utilizes modern JavaScript BigInt capabilities, allowing for incredibly massive numbers without precision loss.

Yes, negative values are supported with a standard minus sign rather than relying on two's complement binary.

This specific utility is designed exclusively for whole integers, not floating-point conversions.

No, entering a, b, c is treated exactly the same as A, B, C during the calculation.

It specifically targets the most common developer bases: Binary (2), Octal (8), Decimal (10), and Hexadecimal (16).

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