Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal and any base 2-36. Supports very large numbers.

Browser Processing Only (Offline Ready)
1

Enter your text

Paste or type your content into the input field.

2

Adjust settings

Configure options to get the result you want.

3

Copy or save

Copy the output to clipboard or save it.

Key Features

All Bases at Once

Enter a number once and see binary, octal, decimal, and hex side by side.

Any Base 2-36

Convert to and from any radix from 2 to 36 with the custom base field.

Big-Integer Accurate

Arbitrary-precision math converts huge values exactly, with no rounding errors.

Fully Offline

All conversion runs locally in your browser — nothing is uploaded.

About This Tool

What is the Number Base Converter?

The Number Base Converter translates a number from one base (radix) to another. Type a value, pick its input base, and instantly see it in binary, octal, decimal, and hexadecimal — plus any custom base from 2 to 36.

Common Uses

  • Programming: Convert between hex color codes, bitmasks, and decimal.
  • Low-level debugging: Read memory addresses and register values.
  • Networking: Work with binary and hex representations of addresses.
  • Learning: Understand how positional number systems relate.

Privacy-First by Design

Conversions are computed entirely in your browser with no network calls. Your numbers are never uploaded or stored, and the tool keeps working offline once loaded.

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FAQ

Any base from 2 to 36. Binary (2), octal (8), decimal (10), and hexadecimal (16) are shown automatically, and you can convert to any other base with the custom field. Digits above 9 use letters a-z.
Yes. The converter uses arbitrary-precision integers, so numbers far beyond the usual 64-bit limit convert exactly without rounding.
No. All processing happens entirely in your browser. Your data never leaves your device — nothing is uploaded to any server.
Yes. Once the page has loaded, the tool works completely offline. For the best experience, install PrivaDeck as a PWA from your browser.