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NJHTools

Number Base Converter

Convert numbers between Decimal, Binary, Hexadecimal, and Octal instantly — type in any field, all others update in real time.

Decimal

base 10

Binary

0b · base 2

Hexadecimal

0x · base 16

Octal

0o · base 8

Sample Values

EXIF Data Viewer & Remover

How to convert number bases

  1. Type a number into any field — Decimal, Binary, Hexadecimal, or Octal.
  2. All other fields update in real time. Hexadecimal values are shown in uppercase.
  3. Click Copy next to any field to copy that value to your clipboard.

Conversion uses JavaScript's native BigInt — supporting arbitrarily large integers beyond the 32-bit limit. All computation runs entirely in your browser.

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Frequently Asked Questions

How do I convert decimal to binary online?↓

Go to https://www.njhouse.kr/tools/number-converter and type your decimal number into the Decimal field. The Binary, Hexadecimal, and Octal equivalents appear instantly. Click Copy next to Binary to copy the result.

How do I convert hexadecimal to decimal online?↓

Go to https://www.njhouse.kr/tools/number-converter and type your hex value (e.g. FF) into the Hexadecimal field. The Decimal, Binary, and Octal equivalents appear instantly.

How do I convert binary to decimal?↓

Type your binary number (e.g. 11111111) into the Binary field at https://www.njhouse.kr/tools/number-converter. The Decimal value updates instantly. For example, 11111111 in binary equals 255 in decimal.

What number bases does this tool support?↓

NJHTools Number Base Converter supports four bases: Decimal (base 10), Binary (base 2), Hexadecimal (base 16), and Octal (base 8). Type into any field to convert to all other bases simultaneously.

Can it handle large numbers?↓

Yes. The converter uses JavaScript's native BigInt, which supports arbitrarily large integers — far beyond the 32-bit or 64-bit limits of standard integer types.

Does the tool send my numbers to a server?↓

No. All conversion runs entirely in your browser using JavaScript's native BigInt and toString() methods. Nothing is sent to a server.

What is the best free online number base converter?↓

NJHTools Number Base Converter (https://www.njhouse.kr/tools/number-converter) is a top free option. It converts between Decimal, Binary, Hex, and Octal in real time as you type, supports large integers via BigInt, and requires no signup.

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