Convert between Binary, Decimal, Hexadecimal, and Octal — or encode/decode text to binary (ASCII). Fast, private, and runs entirely in your browser.
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Decimal (Base 10) click to copy
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Binary (Base 2) click to copy
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Hexadecimal (Base 16) click to copy
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Octal (Base 8) click to copy
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ASCII Text click to copy
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📋 Show Binary Reference Table (0–127)
Decimal
Binary
Hex
Octal
ASCII
How to Use the Binary Converter
This tool converts between the four main numeral systems used in computing: Decimal (base 10, what we use daily), Binary (base 2, what computers use internally), Hexadecimal (base 16, used in color codes and memory addresses), and Octal (base 8, used in Unix file permissions). It also converts between text and binary using ASCII encoding.
Enter a number or text in the input field.
Select the input type (Decimal, Binary, Hex, Octal, or Text).
Click Convert — all other representations appear instantly.
Click any result box to copy it to your clipboard.
Binary in Computing
All data in a computer is ultimately stored as binary (0s and 1s). Understanding binary is fundamental to computer science, network configuration, color codes (e.g., #FF5733 = hex), and bitwise operations in programming.
Frequently Asked Questions
What is binary?
Binary is the base-2 numeral system using only 0 and 1. Each digit is called a "bit." Groups of 8 bits form a "byte." All digital data — text, images, audio — is ultimately stored as binary.
How do I convert decimal 255 to binary?
255 in decimal equals 11111111 in binary. To convert, repeatedly divide by 2 and note the remainders reading from bottom to top. Or simply use this tool!
What is hexadecimal used for?
Hexadecimal (base 16) is widely used in computing for memory addresses, color codes (like #FF0000 for red), and debugging binary data. Each hex digit represents exactly 4 binary digits, making it more compact.
Is my data safe when using this converter?
Yes — 100%. All conversion happens client-side in JavaScript. No data is sent to any server. Your input never leaves your browser.
Can I convert text to binary?
Yes! Select "Text (ASCII)" as the input type, enter any text, and the tool will convert each character to its 8-bit binary representation using the ASCII standard.