What bases are supported?

Any base from 2 (binary) to 36. Bases above 10 use the letters A through Z as additional digits, which is the standard convention in most programming languages and textbooks.

How large can the input number be?

There is no practical limit. The converter uses JavaScript BigInt arithmetic, which handles integers of arbitrary size — thousands of digits — without loss of precision.

Are negative numbers supported?

Yes. Prefix the number with a minus sign. The sign is preserved in all output bases.

Why is binary output grouped with spaces?

Binary strings are padded to the nearest multiple of 4 and split into 4-bit nibbles separated by spaces. This matches common display conventions in datasheets and debuggers and makes the bit pattern easier to read.

Are letters case-sensitive in the input?

No. The input field accepts both uppercase and lowercase letters for digit values above 9. All output is shown in uppercase for clarity.

Number Base Converter

Name: Number Base Converter
Availability: InStock
Author: Nham Vu

Convert any integer between bases 2-36 — binary, octal, decimal, hex, and custom radix — instantly in your browser.

Input Number

Source base

Value

Add target base

Enter a number and click Convert to see it in every base.

Copied!

Summary

Convert any integer between bases 2-36 — binary, octal, decimal, hex, and custom radix — instantly in your browser.

How it works

Select the source base (2 through 36) from the dropdown on the left.
Type your number in the value field. Letters A-Z are accepted for digits above 9 (case insensitive).
The converter validates each character against the selected source base and shows an error for invalid digits.
Click Convert to see the value in binary, octal, decimal, hexadecimal, and any custom target base you have added.
Use "Add target base" to add a custom base (2-36) to the result list, then click the copy button next to any row.

Use cases

Convert IP subnets, color codes, or memory addresses between hex and decimal.
Verify base-32 or base-36 encoded identifiers used in URL shorteners and IDs.
Debug embedded systems code that mixes binary, octal, and hexadecimal literals.
Learn positional notation by watching the same number appear in multiple bases side by side.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu