Free Number Base Converter – Binary, Decimal, Hex & Octal

Enter a hexadecimal value in the hex field and the decimal result updates at once. For example, FF in hex is 255 in decimal. The converter shows binary and octal at the same time too.

The converter supports the four most common bases: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Enter a value in any one and the other three update instantly.

Kisi bhi base ke box mein number type karo — binary, octal, decimal ya hex — aur baaki bases turant update ho jayenge. Programming ke liye bahut useful hai. Sab browser mein hota hai.

Yes. Each field only accepts digits valid for its base, so you cannot enter a 2 in the binary field or a G in the hex field. If an input is invalid, the converter flags it instead of showing a wrong result.

Hexadecimal is a compact way to represent binary, because each hex digit maps to exactly four binary bits. This makes it ideal for writing color codes, memory addresses, and byte values more readably than long binary strings.

Octal (base 8) is most commonly seen in Unix and Linux file permissions, where values like 755 describe read, write, and execute access. The converter lets you translate octal to and from the other bases easily.

Yes. After the page loads, all conversion runs locally in your browser, so the tool keeps working without an internet connection and never contacts a server.

Yes. Everything is processed in your browser. No value you enter is uploaded, logged, or shared, so your data stays entirely on your own device.