Home›Converters›Binary, Hex & Decimal Converter

Binary, Hexadecimal & Decimal Converter

Convert between binary, hexadecimal, decimal and octal number systems instantly — with step-by-step working.

100% free No sign-up Private · runs in your browser

How to use the free online binary, hex & decimal converter

Pick the base of your input (binary, decimal, hex, octal).
Type the number.
See the result in all other bases instantly.
Review the step-by-step working.

About this tool

Convert numbers between binary, octal, decimal and hexadecimal — the four bases every developer works with. Type in any base and see the value in the others instantly, with bit count and signed/unsigned interpretation. Essential for bit manipulation, color values, memory addresses and network math.

Key features

4 number bases
Step-by-step working
Instant conversion
Large numbers OK

Privacy first: every calculation and generation runs 100% locally in your web browser using the Web Crypto API. Your input never touches a server — nothing is stored, logged or sold.

Read the guide

Design · 4 min read

HEX vs RGB vs HSL: color codes for developers

What #6366f1 actually means, when to use RGB, and why HSL is often the smartest choice.

Frequently asked questions

Binary (base-2) uses only 0 and 1 — the native language of computers. Each position represents a power of 2.

Hexadecimal (base-16) uses 0–9 and A–F. Each hex digit maps cleanly to 4 binary bits, making it compact for programmers (e.g. #FF0000 is red).

Multiply each bit by its power of 2 and sum: 1011₂ = 8 + 0 + 2 + 1 = 11. The calculator shows this working step by step.