Decimal to Hex Converter

Convert decimal numbers to hexadecimal. Choose output format (plain, 0x prefix, ...

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Updated

Format:
Hexadecimal Result
FF
Binary
11111111
Octal
377
Division Method
255 ÷ 16 = 15 remainder 15 (F)
15 ÷ 16 = 0 remainder 15 (F)
Reading remainders bottom-up: FF

Common Values

Color Preview

HEX: #0000FF
Use as CSS color code
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256-bit Encryption
Cloud Processing
Mobile Friendly

Converter Features

Division Breakdown - Step-by-step calculation method
Batch Mode - Convert multiple values at once
Three Output Formats - Plain, 0x prefix, or # for colors
Multi-Base Display - Binary and octal alongside hex
Color Preview - Auto color swatch for valid hex colors
One-Click Copy - Copy formatted result to clipboard

Why Use Decimal to Hex Converter?

Division Method Breakdown

See the step-by-step division process showing how each hex digit is derived from your decimal number.

Batch Conversion

Convert multiple decimal numbers at once using comma-separated or newline-separated values.

Output Formats

Choose between plain hex (FF), 0x prefix (0xFF), or # prefix (#FF) for CSS colors.

100% Private

All calculations happen locally in your browser. No server processing needed.

Color Preview

Automatically shows a color preview when the result is a valid 6-digit hex color code.

Multi-Base Output

See the equivalent binary and octal representations alongside the hex result.

Common Uses for Decimal to Hex

CSS Color Codes

Convert RGB decimal values to hex color codes for web design and CSS styling.

Programming

Convert decimal values to hex for memory addresses, bitwise operations, and low-level coding.

Networking

Convert decimal IP components and port numbers to hexadecimal notation.

Education

Learn the division method for decimal-to-hex conversion with step-by-step breakdowns.

How It Works

1

Choose Mode & Format

Select single or batch mode, then pick your output format (plain, 0x prefix, or # for colors).

2

Enter Decimal Numbers

Type a decimal number or paste multiple values separated by commas, spaces, or newlines.

3

Copy the Result

View the hex result with binary and octal equivalents. Click 'Copy' to copy to clipboard.

Tips & Information

Color Codes

Use the # format option to get CSS-ready color codes. Enter 16777215 for #FFFFFF (white) or 255 for #0000FF-range values.

Quick Reference

Common conversions: 255 = FF, 256 = 100, 65535 = FFFF. Click the common values buttons for instant examples.

Large Numbers

JavaScript safely handles integers up to 9,007,199,254,740,991. Very large numbers may lose precision.

Frequently Asked Questions

Divide the decimal number by 16 repeatedly. The remainders (read bottom to top) form the hex number. For example: 255 ÷ 16 = 15 remainder 15. Since 15 = F in hex, 255 decimal = FF hex.
Hexadecimal is widely used in computing for color codes (#FF5733), memory addresses, MAC addresses, Unicode characters, and anywhere binary data needs a compact human-readable format.
255 in decimal equals FF in hexadecimal. This is significant because 255 is the maximum value for an 8-bit byte (2^8 - 1), making FF the largest two-digit hex number.
This tool handles positive integers. For negative numbers in computing, you'd typically use two's complement representation, which requires specifying a bit width.
Plain (FF) gives raw hex, 0x prefix (0xFF) is the standard programming notation used in C, JavaScript, and Python, and # prefix (#FF) is the CSS/HTML color code format.
The color preview shows automatically when the hex result can be interpreted as a valid 6-digit CSS color (i.e., when the decimal input converts to a value that creates a valid RGB color).

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