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Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16) and any custom base instantly.
Type in any field — all bases update instantly.
BASE 2
BASE 8
BASE 10
BASE 16
BASE 32
BASE 36
Custom Base Converter
Result will appear here
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Free Number Base Converter — Binary, Octal, Decimal, Hex
Our free number base converter converts between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16) and any custom base 2–36. All conversions update in real time — fundamental for computer science and programming.
🔢 All Common Bases
Binary, Octal, Decimal, Hex and custom base.
🎚 Custom Base
Any base from 2 to 36.
⚡ Instant
All conversions update in real time.
📋 Copy Any
One-click copy of each converted value.
How to Use — Step by Step
1
Choose input base
Select binary, octal, decimal or hex.
2
Enter your number
Type the number. Invalid characters for that base are rejected.
3
Read all conversions
Binary, octal, decimal and hexadecimal values shown simultaneously.
Frequently Asked Questions
Why do computers use binary?
Binary maps directly to transistor states (off/on). All data — text, images, programs — is stored and processed as binary. Higher bases like hex are compact human-friendly representations.
What is hexadecimal used for?
Memory addresses, HTML/CSS colour codes (#FF6600), error codes, MAC addresses. One hex digit represents exactly 4 binary bits — compact binary notation.
Unix permissions in octal?
Each digit represents read(4)+write(2)+execute(1). chmod 755 = owner rwx(7), group r-x(5), others r-x(5).
Maximum value in n bits?
Unsigned maximum = 2ⁿ - 1. 8 bits = 255. 16 bits = 65,535. 32 bits = 4,294,967,295. This is why old software had limits like "max 65,535 items".
What is base 36?
Uses 0–9 and A–Z (36 symbols). Used by URL shorteners and compact alphanumeric ID systems.