TetraKitsBinary Converter
Convert numbers between decimal, binary, hexadecimal, and octal — enter a value, pick source and target bases, and see the result instantly for programming and computer science work.
Read: Binary Converter Guide: Decimal, Hex & Octal Online →
- Free to Use
- No Signup
- Privacy Friendly
How to convert number bases
- 1
Enter your value
Type a number in decimal (42), binary (101010), hex (2A), or octal (52).
- 2
Select from and to bases
Pick the source base and target base — decimal to binary is the most common.
- 3
Read the result
The converted value appears instantly in the results panel.
Number base conversion
All bases represent the same value using different digit sets. Conversion goes through decimal as an intermediate step.
- Binary (base 2) — digits 0 and 1; used in computing
- Decimal (base 10) — digits 0–9; everyday numbers
- Hexadecimal (base 16) — digits 0–9 and A–F; memory addresses and colors
- Octal (base 8) — digits 0–7; Unix file permissions
Example: 4210 = 1010102 = 2A16 = 528
Why Use This Tool?
Four Bases
Convert between binary, decimal, hex, and octal freely.
Instant Results
Conversion updates as you type or change bases.
CS Homework
Quick checks for programming and computer architecture courses.
Local Math
All conversion runs in your browser.
Frequently Asked Questions
Can I convert negative numbers?
This tool handles non-negative integers. For negative values, use two's complement notation in binary manually.
What is the largest number supported?
JavaScript safe integers up to 9,007,199,254,740,991 (2⁵³ − 1) convert accurately.
How do I read hexadecimal?
Hex digits A–F represent 10–15. 2A hex = (2×16) + 10 = 42 decimal.
Why use octal?
Octal represents Unix file permissions (755 = rwxr-xr-x) and appears in legacy systems.
Is this binary converter free?
Yes. Unlimited conversions with no signup.
Base Conversion Without a Programmer Calculator
Memory addresses, color codes, and subnet masks all mix decimal and hexadecimal — but mental conversion is error-prone. Enter a value, pick bases, and get the answer for homework, interviews, or debugging.
