Number Systems for Computer Science

Learn and verify binary, octal, hex conversions — perfect for CS students and exam prep.

No cal iniciar sessió

Input base:

Decimal number

Quick values

Education tips

🎓

Computer science courses cover all four bases. Use the quick-value buttons (7, 8, 15, 16) to explore where the boundaries between bases are.

💡

Why hex? 1 hex digit = exactly 4 binary digits (a "nibble"). 2 hex digits = 1 byte (8 bits). This makes hex a compact way to write binary.

🔢

Octal (base 8) groups binary digits in sets of 3. Less common today but still used in Unix file permissions (chmod 755 = rwxr-xr-x).

📊

Use the grouped binary output to visualise how nibbles (4-bit groups) map to hex digits — it makes the hex↔binary relationship intuitive.

Introdueix

Enter your data into the tool above. Everything stays local to your browser.

Processa

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Descarrega

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Completament gratuït — sense costos ocults, mai

✓No cal compte, correu electrònic ni inici de sessió

✓Els fitxers no surten mai del teu dispositiu

✓Sense cap límit de mida de fitxer

✓Sense marques d'aigua en cap sortida

Convert Numbers for Programming

Convert between binary, octal, decimal, and hex wh

Convert Numbers for Networking

Convert subnet masks, port numbers, and IP address

Inspect Bit Patterns and Flags

Convert numbers to binary to inspect individual bi

Decode Hex Dumps and Debug Logs

Decode hexadecimal values from crash reports, memo