🔢 Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Supports large numbers and shows all bases simultaneously. Free online number base converter.
0-9
0-1
0-9 A-F
0-7
How to Use
1
Enter any number
Type a number into any of the four fields: Decimal, Binary, Hexadecimal, or Octal.
2
All bases update instantly
The other three fields automatically update with the equivalent value in real-time.
3
Copy any format
Click the Copy button next to any field to copy that representation to your clipboard.
Frequently Asked Questions
What are the different number bases?
Decimal (base 10) uses digits 0-9 and is the everyday number system. Binary (base 2) uses only 0 and 1, used by computers. Octal (base 8) uses digits 0-7. Hexadecimal (base 16) uses 0-9 and A-F, widely used in programming for memory addresses and colors.
What does 0x prefix mean in hexadecimal?
0x is the standard prefix for hexadecimal numbers in most programming languages (C, JavaScript, Python). So 0xFF = 255 in decimal. Similarly, 0b prefix is used for binary (0b11111111 = 255).
How do I convert a hex color code to RGB?
A hex color like #FF5733 has three pairs: FF (red), 57 (green), 33 (blue). Convert each pair from hex to decimal: FF=255, 57=87, 33=51. Result: rgb(255, 87, 51). Our Color Picker tool does this automatically.
What is the largest number supported?
The tool handles integers up to JavaScript's Number.MAX_SAFE_INTEGER (2^53 - 1 = 9,007,199,254,740,991). For very large numbers (64-bit+), precision may be limited.
Is any data sent to a server?
No. All conversions are calculated in your browser using JavaScript's built-in parseInt() and toString() functions. Nothing is sent anywhere.
完整指南：数制转换工具
什么是数制转换？
在二进制（2进制）、八进制（8进制）、十进制（10进制）和十六进制（16进制）之间转换。对底层编程、CSS颜色定义、Unix文件权限和网络计算至关重要。
如何使用
- 在任意进制输入数字。
- 所有其他进制的转换结果即时显示。
- 点击任意结果复制。
专业技巧
- 标准前缀：
0b二进制，0o八进制，0x十六进制。 - Unix权限
chmod 755是八进制：7=rwx，5=r-x。 - CSS颜色
#7c6af7是十六进制，等于RGB(124,106,247)。