Decimal to Hex Converter

Convert decimal (base 10) numbers to hexadecimal (base 16) instantly. Supports single values, batch conversion, and formatting options including 0x prefix and uppercase/lowercase output.

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Convert hexadecimal to decimal instead

Go to Hex to Decimal →
Enter positive integers. Separate multiple values with commas, spaces, or new lines.

📋 Quick Reference Table:

Decimal Hexadecimal
00x0
100xA
150xF
160x10
1000x64
2550xFF
2560x100
10000x3E8
40950xFFF
655350xFFFF

💡 Quick Guide:

  • Decimal: Base 10 number system using digits 0-9
  • Hexadecimal: Base 16 number system using 0-9 and A-F
  • 0x Prefix: Common in programming to denote hex values
  • Batch Conversion: Convert multiple values at once

About Decimal to Hex Converter

Our free online decimal to hex converter makes it easy to convert decimal numbers to hexadecimal format. Whether you're working with color codes, memory addresses, programming constants, or learning number systems, this tool provides instant, accurate conversions with customizable formatting options.

Key Features

  • Instant Conversion: Convert decimal to hex in real-time
  • Batch Processing: Convert multiple decimal values at once
  • Formatting Options: Choose between uppercase/lowercase and with/without 0x prefix
  • Large Number Support: Handles decimal values of any size
  • Quick Reference Table: See common conversions at a glance
  • Copy to Clipboard: One-click copy for easy use
  • Auto-Update: Results update automatically when changing formatting options
  • Multiple Input Formats: Accepts comma, space, or newline-separated values

How to Convert Decimal to Hex

  1. Enter Decimal Value: Type or paste decimal numbers (e.g., 255, 1000, 16777215)
  2. Choose Format: Select uppercase/lowercase and 0x prefix options
  3. Multiple Values: Separate multiple values with commas, spaces, or new lines
  4. Convert: Click "Convert to Hex" button
  5. Copy: Use the copy button to use results in your work

Understanding Decimal to Hex Conversion

Decimal to hexadecimal conversion involves dividing the decimal number by 16 repeatedly and collecting the remainders. The remainders, read in reverse order, form the hexadecimal equivalent. Remainders 10-15 are represented by letters A-F.

Example conversion: To convert 255 to hex: 255 ÷ 16 = 15 remainder 15 (F), 15 ÷ 16 = 0 remainder 15 (F). Reading remainders in reverse: FF. Therefore, 255 decimal = 0xFF hexadecimal.

Color codes: RGB colors use hex values where each color component (R, G, B) ranges from 0-255 (0x00-0xFF). For example, RGB(255, 87, 51) = #FF5733 in hexadecimal.

Common Use Cases

  • Web Design: Convert RGB color values to hex codes for CSS (#RRGGBB)
  • Programming: Create hex constants for bit masks, flags, and memory addresses
  • Debugging: Format decimal values as hex for easier comparison with hex dumps
  • Networking: Convert decimal IP address components to hexadecimal
  • Graphics: Work with pixel colors and palette indices in hex format
  • Embedded Systems: Convert decimal register values to hex for hardware programming
  • Education: Learn and practice number system conversions

Formatting Options Explained

0x Prefix: The "0x" prefix is a convention used in many programming languages (C, C++, Java, JavaScript, Python) to indicate that a number is in hexadecimal format. For example, 0xFF clearly shows this is hex FF, not decimal 255.

Uppercase vs Lowercase: Both are valid. Uppercase (0xFF) is more common in programming for better visibility. Lowercase (0xff) is sometimes preferred for web color codes (#ff5733). The values are equivalent.

Without prefix: Useful for CSS color codes (#FF5733), HTML color attributes, or when the context already indicates hexadecimal format.

Conversion Examples

Example 1: 255 converts to 0xFF
Common value representing maximum 8-bit number

Example 2: 1000 converts to 0x3E8
Nice round decimal number in unusual hex format

Example 3: 16777215 converts to 0xFFFFFF
White color in 24-bit RGB (255, 255, 255)

Example 4: Multiple values: 16, 32, 255 converts to 0x10, 0x20, 0xFF

RGB to Hex Color Conversion

To convert RGB colors to hex codes, convert each component (R, G, B) separately:

RGB(255, 87, 51):
R: 255 → FF
G: 87 → 57
B: 51 → 33
Result: #FF5733

Use this converter to convert each component, then combine them with a # prefix for CSS color codes.

Tips for Using This Converter

  • Use uppercase with 0x prefix for programming constants (e.g., 0xFF)
  • Use lowercase without prefix for web color codes (e.g., ff5733)
  • Formatting options update results automatically - no need to reconvert
  • Separate multiple values with commas, spaces, or put them on separate lines
  • Use the quick reference table for common conversions
  • Perfect for converting RGB color components to hex

Hexadecimal in Different Languages

C/C++: int value = 0xFF; // 255 in decimal

JavaScript: const color = 0xFF5733; // RGB color

Python: value = 0xFF # 255 in decimal

CSS: color: #FF5733; /* Hex color code */

HTML: <font color="FF5733">

Common Decimal to Hex Values

  • Powers of 2: 2=0x2, 4=0x4, 8=0x8, 16=0x10, 32=0x20, 64=0x40, 128=0x80, 256=0x100
  • Byte boundaries: 255=0xFF, 256=0x100, 65535=0xFFFF, 65536=0x10000
  • Color values: 0=0x00 (black), 128=0x80 (mid-gray), 255=0xFF (white/max)
  • Round numbers: 10=0xA, 100=0x64, 1000=0x3E8, 10000=0x2710

Why Use Hexadecimal?

  • Compact: Represents large numbers in fewer characters than decimal
  • Byte-aligned: 2 hex digits = exactly 1 byte (8 bits)
  • Binary-friendly: Each hex digit = 4 bits, easy to convert to/from binary
  • Standard format: Universal in computing, networking, and digital electronics
  • Readability: More human-readable than long binary strings

Privacy and Security

All conversions are performed entirely in your web browser using JavaScript. No data is sent to any server, ensuring your values remain completely private and secure.