Number Base Converter

Binary, octal, decimal, hex and any base up to 36 — arbitrary precision

Number Base Converter is a free online browser-based utility designed to binary, octal, decimal, hex and any base up to 36 — arbitrary precision. All computations, processing, and rendering happen completely inside your browser client, ensuring your data is kept secure and private.

How to use Number Base Converter

  1. Enter Inputs. Input your data, values, or upload your file into the provided container panel.
  2. Configure Options. Adjust sliders, selectors, or toggles to customize your desired output parameters.
  3. Verify Live Preview. Review the instant calculation or visual representation generated in real-time.
  4. Export Result. Click the Copy or Download button to save your formatted output.

Features

  • Clean Interface: Streamlined layout designed for maximum focus and efficiency.
  • One-Click Copy/Download: Easily export results to your clipboard or local files.
  • Offline Ready: Works without an internet connection once loaded in your browser.

Why use this tool

  • 100% Privacy: All processing happens locally in your browser. No files or inputs are sent to any servers.
  • Lightning Fast: Instant client-side calculations with zero network latency or server load times.
  • Mobile Responsive: Designed to work flawlessly on smartphones, tablets, and desktop browsers.

Frequently asked questions

How do I convert decimal to binary?

Repeatedly divide the number by 2 and read the remainders from last to first. For example, 255 becomes 11111111. In the tool, enter the number with input base 10 and the binary, octal, hexadecimal, base 32 and base 36 forms appear together.

How do I convert hexadecimal to decimal?

Set the input base to 16 and type the hex digits, or multiply each digit by a power of 16. For example, ff is 15 x 16 + 15 = 255, and 1a is 26. The letters a to f stand for 10 to 15.

What bases does the converter support?

Any base from 2 to 36. Digits above 9 use the letters a to z, so base 36 uses every digit and letter. Quick rows show binary, octal, decimal, hexadecimal, base 32 and base 36, plus one custom output base of your choice.

Can it convert very large numbers exactly?

Yes. It uses arbitrary-precision integers, so numbers far beyond the normal 2^53 limit of JavaScript numbers convert without rounding. Negative integers work as well. Fractions and decimals with a point are not supported, only whole numbers.

Why does it say not a valid number?

A digit in your input is not allowed in the chosen input base. For instance 2 is invalid in binary, 8 is invalid in octal and g is invalid in hexadecimal. Check the input base selector, and remove any prefix like 0x or 0b, which the tool does not recognise.

What is the binary or hex value of 255?

255 in decimal is 11111111 in binary, 377 in octal and ff in hexadecimal. It is the largest value of one byte (2^8 minus 1), which is why hex color codes use ff as the maximum for each of red, green and blue.

Is my data shared when using the Number Base Converter?

No. Toolskyt operates under a zero-server policy. All calculations, data formatting, and file exports are executed locally on your machine.

Do I need to sign up or pay to use the Number Base Converter?

No, this tool is 100% free. There are no limits, sign-ups, subscriptions, or hidden charges required.

Related tools