How to Use This Tool
Enter a Number
Type a number into the input field. It can be in any of the four supported bases.
Select the Input Base
Choose whether your number is Binary, Decimal, Octal, or Hexadecimal from the dropdown.
See All Conversions
The tool instantly shows the same number in all four bases at once. For small decimal values, an 8-bit binary form is also shown.
Copy Any Result
Click the copy button next to any result to put it on your clipboard.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser.
Is my data sent to a server?
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No. All conversion happens directly in your browser. Nothing you type is ever sent anywhere.
What number systems are supported?
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Four: Binary (base 2, digits 0-1), Decimal (base 10, digits 0-9), Octal (base 8, digits 0-7), and Hexadecimal (base 16, digits 0-9 and A-F).
What is binary?
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Binary is the base-2 number system used by computers. It uses only the digits 0 and 1. Every piece of data in a computer is stored as binary.
What is hexadecimal?
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Hexadecimal (hex) is the base-16 system using digits 0-9 and letters A-F. It is a compact way to represent binary values and is widely used for colors, memory addresses, and encoding.
What is octal?
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Octal is the base-8 system using digits 0-7. It is used in file permissions and some legacy computing contexts.
What is the 8-bit binary?
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For decimal values between 0 and 255, the tool shows a zero-padded 8-bit binary representation. This is how a single byte is written in binary.
Can I enter hex values with letters?
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Yes. Use digits 0-9 and letters A-F (case does not matter). For example, FF equals 255 in decimal.
Does it handle large numbers?
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Yes. The tool handles numbers of any size that your browser can process.
Does it update instantly?
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Yes. The results appear as soon as you type. No button to click.
What Is Binary Converter?
Binary Converter is a free tool that converts numbers between binary, decimal, octal, and hexadecimal right in your browser. Enter a number in any of the four bases and see it instantly in all the others. Nothing you type is ever sent anywhere - all math runs locally on your device.
The tool shows all four conversions at once with copy buttons, so you can grab whichever format you need in one click. For small decimal values, it also shows the padded 8-bit binary form.
Features Explained
Four Number Bases
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Convert between Binary (base 2), Decimal (base 10), Octal (base 8), and Hexadecimal (base 16) simultaneously.
All Results at Once
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Enter a number in any base and see it in all four formats instantly. No need to convert one pair at a time.
8-Bit Binary Display
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For decimal values 0 through 255, a padded 8-bit binary representation is shown so you can see how a single byte looks.
Any Input Base
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Select your input base from the dropdown. The tool accepts binary digits (0-1), octal (0-7), decimal (0-9), or hex (0-9, A-F).
Copy Buttons
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Each result has its own copy button so you can grab the binary, decimal, octal, or hex value in one click.
Instant Conversion
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Results update live as you type. No Convert button needed.
Input Validation
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If you enter digits that are not valid for the selected base, the tool shows an error message.
Case Insensitive Hex
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Hexadecimal letters can be entered in uppercase or lowercase. The tool handles both.
Large Number Support
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The tool handles numbers of any size your browser can process, not just small byte values.
100% Browser-Based
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All conversion runs directly in your browser. Nothing you type is ever sent to any server.
Who Is This Tool For?
Computer Science Students
Convert between number bases for homework, exams, and understanding how computers store data.
Programmers
Convert between hex, binary, and decimal when debugging, reading memory addresses, or working with bitwise operations.
Web Developers
Convert hex color codes to decimal or binary for styling, accessibility calculations, and color manipulation.
Network Engineers
Convert IP addresses and subnet masks between binary, decimal, and hexadecimal.
Embedded Engineers
Convert register values and memory addresses between hex, binary, and decimal for microcontroller programming.
Teachers
Demonstrate number base conversions in real time during computer science and math lessons.
Cybersecurity Analysts
Convert hex values from packet captures, log files, and malware analysis to other bases.
Electronics Hobbyists
Convert between binary and hex when reading datasheets, configuring registers, and wiring circuits.
Game Developers
Convert color codes, sprite data, and memory offsets between hex and decimal.
Database Administrators
Convert hex and binary field values when inspecting raw data and debugging queries.
QA Engineers
Convert error codes and memory addresses from hex to decimal for bug reports.
IT Support
Convert hex error codes to decimal when researching solutions and troubleshooting systems.
Data Scientists
Convert between bases when working with encoded data, hash values, and binary flags.
Math Students
Practice number base conversions and understand positional number systems.
Firmware Developers
Convert flash memory addresses and configuration bytes between hex and binary.
Digital Designers
Convert binary signal values to hex and decimal for logic design and verification.
Reverse Engineers
Convert hex dumps and binary payloads to readable decimal values.
Arduino and Raspberry Pi Users
Convert pin configurations and register values between binary, hex, and decimal.
System Administrators
Convert file permission codes between octal and binary.
CTF Players
Convert encoded values between bases for capture-the-flag challenges.
Cryptographers
Convert key values and cipher outputs between hex, binary, and decimal.
Protocol Analysts
Convert protocol field values between hex and decimal when reading specifications.
Hobbyists
Explore number systems and convert values for personal projects and learning.
Anyone
Quickly convert any number between binary, decimal, octal, and hex for any reason.
Tips for Best Results
Common hex values
FF = 255 decimal, 0A = 10 decimal, 10 = 16 decimal. Hex is just a compact way to write binary.
Octal for file permissions
Linux file permissions use octal: 755 = rwxr-xr-x, 644 = rw-r--r--. Convert to binary to see each permission bit.
8 bits = 1 byte
One byte ranges from 00000000 to 11111111 in binary, 0 to 255 in decimal, and 00 to FF in hex.
Hex pairs represent bytes
Every two hex digits represent one byte. FF is one byte (255), FFFF is two bytes (65535).
Binary is base 2
Each binary digit is a power of 2: 1, 2, 4, 8, 16, 32, 64, 128. So 10110 = 16+4+2 = 22.
Hex to binary shortcut
Each hex digit maps to exactly 4 binary bits. F = 1111, A = 1010, 5 = 0101. Convert one digit at a time.
Copy any result
Click the copy button next to any base to grab that value without selecting it manually.
Results update instantly
Change the input and all four bases recalculate immediately.
Case does not matter for hex
You can type ff or FF or fF. The tool treats them all the same.
Privacy is built in
Nothing you type is ever sent to any server. All conversion runs in your browser.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
