Math Tools5 min read•2026-05-30
Number Base Converter Free: Binary Hex Decimal Online
By FreeToolbox Team
Number Base Converter Free: Binary Hex Decimal Online
Need to convert between number bases? Our free converter handles binary, octal, decimal, and hexadecimal.
Number Bases
| Base | Name | Digits | Use Case |
|---|---|---|---|
| 2 | Binary | 0, 1 | Computing |
| 8 | Octal | 0-7 | Unix permissions |
| 10 | Decimal | 0-9 | Human counting |
| 16 | Hex | 0-9, A-F | Colors, memory |
Common Conversions
| Decimal | Binary | Octal | Hex |
|---|---|---|---|
| 0 | 0000 | 0 | 0 |
| 10 | 1010 | 12 | A |
| 16 | 10000 | 20 | 10 |
| 255 | 11111111 | 377 | FF |
| 256 | 100000000 | 400 | 100 |
Why Convert Bases?
- Programming: Color codes (#FF0000), memory addresses
- Networking: IPv4 addresses, subnet masks
- Unix: File permissions (chmod 755)
- Web: CSS colors, HTML entities
FreeToolbox Base Converter
Features: - 100% free, no registration - Binary, octal, decimal, hexadecimal - Real-time conversion - Copy all formats
Try: [Base Converter](/tools/base-converter)
How to Use
- Enter a number in any base
- Select input base
- See instant conversion to all bases
- Copy any result
Common Use Cases
- CSS colors: #FF5733 to RGB(255, 87, 51)
- File permissions: chmod 755 to rwxr-xr-x
- Memory addresses: 0x7FFF to 32767
- Subnet masks: 255.255.255.0 to binary
Frequently Asked Questions
**Q: Can I convert negative numbers?** A: Currently supports positive integers.
**Q: What is the max number?** A: Supports up to 64-bit integers.
[Base Converter](/tools/base-converter)