🎨 Color Preview
This hex value represents a valid web color
⚡ Common Values
| Decimal | Hex | Binary | Decimal | Hex | Binary |
|---|---|---|---|---|---|
| 0 | 0 | 0000 | 8 | 8 | 1000 |
| 1 | 1 | 0001 | 9 | 9 | 1001 |
| 2 | 2 | 0010 | 10 | A | 1010 |
| 3 | 3 | 0011 | 11 | B | 1011 |
| 4 | 4 | 0100 | 12 | C | 1100 |
| 5 | 5 | 0101 | 13 | D | 1101 |
| 6 | 6 | 0110 | 14 | E | 1110 |
| 7 | 7 | 0111 | 15 | F | 1111 |
What is Hexadecimal?
Hexadecimal (hex) is a base-16 number system that uses 16 symbols: 0–9 for values zero through nine, and A–F for values ten through fifteen. It's widely used in computing because it provides a human-readable way to represent binary data—each hex digit corresponds to exactly 4 binary bits.
📐 Conversion Formula
Decimal to Hex: Divide by 16 repeatedly, reading remainders bottom-to-top
255 ÷ 16 = 15 remainder 15 → F (first digit)
15 ÷ 16 = 0 remainder 15 → F (second digit)
Result: FF
Hex to Decimal: Multiply each digit by 16^position and sum
FF = (15 × 16¹) + (15 × 16⁰) = 240 + 15 = 255
Why Hexadecimal is Used
🎨 Web Colors
CSS colors like #FF5733 use hex. Each pair represents Red, Green, Blue values (0–255). #FF5733 = RGB(255, 87, 51).
💾 Memory Addresses
Computer memory locations are written in hex (e.g., 0x7FFF5694). It's more compact than binary and aligns with byte boundaries.
🔐 Cryptography
Hash values (MD5, SHA-256) are displayed in hex. A SHA-256 hash is 64 hex characters representing 256 bits.
📝 Character Encoding
ASCII and Unicode code points are often written in hex. The letter 'A' is 0x41 (decimal 65).
Hex in Different Contexts
- 0x prefix: Used in programming (C, JavaScript, Python) to denote hex:
0xFF - # prefix: Used in CSS for colors:
#FFFFFF - h suffix: Used in assembly language:
FFh - \x prefix: Used for hex escape sequences in strings:
\x41= "A"
Common Hex Values to Know
- 0xFF (255) — Maximum value of one byte (8 bits)
- 0xFFFF (65,535) — Maximum 16-bit unsigned integer
- 0xFFFFFFFF (4,294,967,295) — Maximum 32-bit unsigned integer
- 0x7FFFFFFF (2,147,483,647) — Maximum 32-bit signed integer
- 0x100 (256) — Number of values in one byte (2⁸)
- 0x400 (1,024) — 1 kilobyte in decimal
Frequently Asked Questions
How do I convert decimal to hex manually?
Divide the decimal number by 16. The remainder becomes the rightmost hex digit. Continue dividing the quotient by 16 until you reach 0, collecting remainders. Read the remainders from bottom to top. For remainders 10–15, use letters A–F.
What does the 0x prefix mean?
The "0x" prefix indicates that a number is in hexadecimal format. This convention is used in many programming languages (C, C++, Java, JavaScript, Python) to distinguish hex from decimal numbers. Without it, "10" could mean ten (decimal) or sixteen (hex).
How do hex color codes work?
Hex color codes like #FF5733 contain three pairs of hex digits representing Red, Green, and Blue values from 0 (00) to 255 (FF). #FF5733 means Red=255, Green=87 (0x57), Blue=51 (0x33). #000000 is black, #FFFFFF is white.
Can hex numbers be negative?
Hexadecimal itself doesn't have a sign. Negative numbers in computers are typically represented using two's complement notation. For example, -1 as a 32-bit signed integer is 0xFFFFFFFF. This tool displays negative decimals with a minus sign for clarity.
Why is hex used instead of binary?
Hex is more compact and human-readable than binary. One hex digit represents exactly 4 binary bits, so a byte (8 bits) is just 2 hex digits instead of 8 binary digits. Example: binary 11111111 = hex FF (much easier to read and remember).
What's the difference between hex and octal?
Hex is base-16 (0–9, A–F), while octal is base-8 (0–7). Hex is more common today because it aligns with byte boundaries (2 hex digits = 1 byte). Octal was historically used in some older systems and is still used for Unix file permissions (e.g., chmod 755).
How do I convert hex to decimal?
Multiply each hex digit by 16 raised to its position (starting from 0 on the right) and sum the results. For "1A3": (1 × 16²) + (10 × 16¹) + (3 × 16⁰) = 256 + 160 + 3 = 419.
Is this converter accurate for large numbers?
This tool uses JavaScript's native number handling, which is accurate for integers up to 2^53 - 1 (9,007,199,254,740,991). For larger numbers, precision may be lost. For cryptographic or arbitrary-precision work, use specialized libraries.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed using standard formulas and should be verified for critical applications.
Related Tools
- Bitrate File Size Calculator -- Calculate file size from bitrate and duration, or vice versa
- Internet Bandwidth Calculator -- Estimate download and upload times for any file size at various internet speeds
- UUID Generator -- Generate random UUIDs instantly
- Binary File Size Calculator -- Convert file sizes between decimal and binary units with bits/bytes support
Related Tools
View all toolsASCII Table
ASCII codes with decimal, hex, and character lookup
UUID Generator
Generate random UUIDs instantly
Binary to Decimal Converter
Convert binary numbers to decimal
Base Converter
Convert numbers between bases 2 and 36
Data Size Converter
Convert between bytes, KB, MB, GB, and TB
Binary File Size Calculator
Convert file sizes between decimal and binary units with bits/bytes support
Decimal to Hex Converter FAQ
What is Decimal to Hex Converter?
Decimal to Hex Converter is a free digital & computing tool that helps you Convert decimal numbers to hexadecimal.
How do I use Decimal to Hex Converter?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Decimal to Hex Converter private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Decimal to Hex Converter require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Decimal to Hex Converter?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Decimal to Hex Converter?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.