🔢Number Base Converter

Number base converter — bin, dec, oct, hex in one place

Our free number base converter lets you instantly convert numbers between the four most common bases: binary, octal, decimal, and hexadecimal. Just enter a value, choose the input base, and the results appear immediately — no button click needed. You can copy any result to the clipboard with a single click.

What are number base conversions used for?

Number bases are the foundation of computing and electronics. Programmers use hexadecimal when analysing memory, CSS colours, or network protocols. Binary is the basis of how every processor works. Octal appears in file permissions on Unix/Linux systems (e.g. chmod 755). Our converter is a handy tool for both computer science students and experienced developers.

Frequently asked questions

How does the number base converter work?

Enter a number and choose the source base (binary, octal, decimal, or hexadecimal). The converter instantly converts the value and shows the result in all four bases at once.

Which characters are allowed in hexadecimal (hex)?

In hexadecimal you can use digits 0–9 and letters A–F (or a–f — case does not matter). The result is always displayed in uppercase, e.g. 255 in decimal is FF in hexadecimal.

Does the converter handle large numbers?

Yes. The converter uses the built-in BigInt type, so it correctly converts very large integers — without the loss of precision caused by the standard JavaScript floating-point type.

Can I convert negative or fractional numbers?

No — the converter only supports non-negative integers (0 and above). Decimal fractions and negative values are not supported.