Developer Tools

Binary / Hex / Octal Converter

Convert numbers between binary, decimal, hexadecimal, and octal instantly. All four bases, bidirectional, with step-by-step breakdown.

Runs in browserFree & no signupAll 4 number bases

Decimal (Base 10)

Binary (Base 2)

Hex (Base 16)

Octal (Base 8)

How to convert binary, hex, and octal numbers

Enter any number in any base and instantly see the equivalent in decimal, binary, hexadecimal, and octal.

01
Enter your number
Type the value you want to convert into the input field. The tool auto-detects the base, or you can select the input base manually — decimal, binary (base 2), hexadecimal (base 16), or octal (base 8).
02
Select the input base
Choose the number system your input is in. For example, if you're converting a hex color code like FF3A00, select Hexadecimal as the input base.
03
Read all output bases at once
The tool instantly shows the equivalent value in all four bases simultaneously — decimal, binary, hexadecimal, and octal. No need to convert one at a time.
04
Copy any result
Click the copy icon next to any output field to copy that value to your clipboard. Useful when you need the hex or binary representation in your code.

What people use it for

Binary and hex conversions come up constantly in programming, networking, electronics, and computer science education.

Programming & computer science

Convert between number bases when working with bitwise operations, memory addresses, flags, or low-level data manipulation in C, Python, or assembly.

Web & CSS color codes

Decode hex color values like #1A2B3C into their decimal RGB components, or convert decimal color values back to hex for use in stylesheets.

Networking & IP addresses

Convert subnet masks, IP octets, and port numbers between decimal and binary to understand CIDR notation and network addressing.

Electronics & embedded systems

Work with register values, bitmasks, and hardware addresses that are commonly expressed in binary or hexadecimal in datasheets.

Learning number systems

Students learning binary arithmetic or computer architecture can use the tool to check their manual conversions and build intuition for different bases.

File permissions (Unix/Linux)

Convert octal permission values like 755 or 644 to binary to visualize exactly which read, write, and execute bits are set for each user class.

Frequently asked questions

Common questions about number base conversion and how the tool works.

The tool converts between decimal (base 10), binary (base 2), hexadecimal (base 16), and octal (base 8) — the four bases most commonly used in computing.

Yes, completely free. No account, no limits, no ads blocking the result. Just enter your number and get all conversions instantly.

The tool handles standard 32-bit and 64-bit integer ranges. For very large numbers beyond JavaScript's safe integer limit, results may lose precision — use a dedicated big-integer library for those cases.

Yes. Enter a negative decimal value and the tool will show the two's complement binary representation along with the other bases.

The converter works with integers. Floating-point binary (IEEE 754) conversion is a different operation and is not currently supported.

Select Hexadecimal as the input base, then type your value using digits 0–9 and letters A–F (case-insensitive). You don't need to include a 0x prefix.

Yes. The tool is fully responsive and works on any modern smartphone or tablet browser.

No. All conversions happen entirely in your browser using JavaScript. Nothing you type is sent to any server.

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How to convert binary, hex, and octal numbers

Enter any number in any base and instantly see the equivalent in decimal, binary, hexadecimal, and octal.

Enter your number

Type the value you want to convert into the input field. The tool auto-detects the base, or you can select the input base manually — decimal, binary (base 2), hexadecimal (base 16), or octal (base 8).

Select the input base

Choose the number system your input is in. For example, if you're converting a hex color code like FF3A00, select Hexadecimal as the input base.

Read all output bases at once

The tool instantly shows the equivalent value in all four bases simultaneously — decimal, binary, hexadecimal, and octal. No need to convert one at a time.

Copy any result

Click the copy icon next to any output field to copy that value to your clipboard. Useful when you need the hex or binary representation in your code.