Decimal to Hexadecimal Converter
Convert decimal (base-10) numbers to hexadecimal (base-16) representation for memory addresses, color codes, and low-level programming
Conversion Options
Common: 2, 4, 6, 8 digits (0 = no padding)
Recommended Settings
Pro Tips
- •Hexadecimal uses digits 0-9 and letters A-F to represent values 0-15
- •One hex digit represents 4 bits (a nibble), two hex digits represent a byte
- •Memory addresses are typically shown in hexadecimal (0x00400000)
- •RGB color codes are hex: #FF5733 = Red:255, Green:87, Blue:51
Most Popular
Most users choose uppercase with 0x prefix for programming contexts
When to Use This Tool
Convert decimal memory addresses to hexadecimal format used in debuggers, memory dumps, and low-level programming. Hex is the standard representation for memory addresses because it's compact and aligns perfectly with byte boundaries (2 hex digits = 1 byte).
Convert RGB decimal values (0-255) to hexadecimal for CSS color codes. Web colors use hex format (#RRGGBB) where each color channel (red, green, blue) is represented by two hex digits. Essential for web development and digital design.
Work with hex values in assembly language, embedded systems, firmware development, and hardware debugging. Hexadecimal is preferred because it's more compact than binary while maintaining clear bit patterns - each hex digit maps to exactly 4 bits.
Analyze network packets, protocol data, and binary file formats where data is typically displayed in hexadecimal. Hex dumps are the standard way to view raw binary data, making it easier to identify patterns, magic numbers, and data structures.
How It Works
Parse input decimal numbers from text (supports multiple formats and delimiters)
Convert each decimal number to hexadecimal using JavaScript's toString(16) method
Handle negative numbers based on selected method (two's complement, negative sign, or unsigned)
Apply uppercase or lowercase formatting for hex letters (A-F or a-f)
Apply padding to specified number of digits for consistent width
Add hexadecimal prefix (0x) if enabled for programming language syntax
Group digits by specified size (bytes/words) for improved readability
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Frequently Asked Questions
What is hexadecimal and why is it used?
Hexadecimal (base-16) uses digits 0-9 and letters A-F to represent values 0-15. It's widely used in computing because it's compact yet human-readable, and maps perfectly to binary - each hex digit represents exactly 4 bits. This makes it ideal for memory addresses, color codes, and debugging.
Should I use uppercase (A-F) or lowercase (a-f)?
Both are valid and functionally identical. Uppercase is more traditional and common in documentation, memory dumps, and color codes (#FF5733). Lowercase is sometimes preferred in modern programming for consistency with variable naming. Choose based on your style guide or convention.
What does the 0x prefix mean?
The 0x prefix indicates a hexadecimal number in programming languages like C, C++, JavaScript, Python, etc. For example, 0xFF means hexadecimal FF (decimal 255). It prevents confusion between hex and decimal - without the prefix, 'A5' could be misinterpreted. Use the prefix when writing code.
How do I convert RGB colors to hex?
RGB uses three decimal values (0-255) for red, green, and blue. Convert each to 2-digit hex, then combine with # prefix. For example, RGB(255, 87, 51) becomes #FF5733. Each color gets 2 hex digits: Red=FF, Green=57, Blue=33.
How are negative numbers represented in hexadecimal?
Two common methods: (1) Two's complement (standard in computers) - negative numbers use high bits set, e.g., -1 = 0xFFFFFFFF (32-bit). (2) Negative sign - prefix with minus, e.g., -10 = -0xA. Choose two's complement for low-level programming, negative sign for mathematical clarity.
Why group hex digits and what size should I use?
Grouping improves readability for long hex numbers. Group by 2 (bytes) for memory dumps and color codes: FF 5A 3C. Group by 4 (words) for memory addresses: 0040 1A2B. Grouping by 8 shows 32-bit values clearly. Choose based on the data structure you're working with.