Convert Numbers for Programming

Convert between binary, octal, decimal, and hex while writing code — instant reference for any number.

Engin innskráning krafist

Input base:

Decimal number

Quick values

Programming tips

💻

Programmers frequently need to convert between decimal (what humans use) and hex (memory addresses, colours, bit flags).

💡

0xFF is 255 in decimal and 11111111 in binary — a fully set byte. The "Quick values" panel shows common programming constants like 127, 255, 65535.

🔢

The bit-size panel shows whether your number fits in 8, 16, or 32 bits — useful when working with typed arrays or protocol buffers.

🎨

CSS hex colours are base-16: #1A2B3C = R:0x1A (26), G:0x2B (43), B:0x3C (60). Convert each channel separately to inspect the colour.

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

Ferli

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

Sækja

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

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