Number base converter
Convert numbers between binary, octal, decimal and hexadecimal bases. Supports custom bases from 2 to 36.
- Free, no sign-up
- No data stored
- Reviewed 2026-01-15
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About the Number Base Converter
Enter a number in any base (2–36) and convert it to another. Common conversions: binary ↔ decimal, hexadecimal ↔ decimal, octal ↔ binary. The result shows the conversion and grouped digits for readability.
How to use the Number Base Converter
- Enter the number to convert.
- Select the source base.
- Select the target base.
- View the converted result.
Frequently asked questions
What digits are used above base 10?
Bases 11–36 use letters A–Z (case-insensitive). For example, hex (base 16) uses 0–9 and A–F.
Can I convert fractions?
This tool handles integers only. Fractional base conversion has precision issues and is not supported.
What is the maximum number size?
Up to 64-bit integers (about 18 quintillion in decimal). Larger values may lose precision.