A number base converter is an online tool that translates a number from one positional numeral system (base) to another. Common bases include binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). It is essential for programmers, computer scientists, and students who work with different number representations.

Simply type a valid number into any of the four input fields (binary, octal, decimal, or hexadecimal). The other three fields will instantly update with the equivalent value. Use the copy icon next to each field to copy the result to your clipboard. The converter accepts only non-negative integers.

The four most widely used systems in computing and daily life are:

• Binary (Base 2) – uses digits 0 and 1.
• Octal (Base 8) – uses digits 0–7.
• Decimal (Base 10) – uses digits 0–9 (the everyday number system).
• Hexadecimal (Base 16) – uses digits 0–9 and letters A–F.

This tool only handles non‑negative integers. Negative numbers in binary often use two’s complement representation, which is not supported here. For signed operations, you may need a dedicated signed integer converter.

Inputs are limited to 64 characters. However, JavaScript’s parseInt() can accurately handle integers up to roughly 9 quadrillion (2⁵³‑1) without precision loss. For larger numbers, results may become approximations. For cryptographic or arbitrary‑precision needs, consider a big‑integer library.

Group the binary digits into sets of four, starting from the right. Pad the leftmost group with zeros if needed. Then replace each 4‑bit group with its equivalent hex digit (0000→0, 0001→1, … 1111→F). Example: binary 10110111 → groups 1011 0111 → hex B7.

Yes, this base converter is completely free, runs entirely in your browser, and never sends your data to any server. No registration or installation is required.