Dev Tools
Number Base Converter
Type in any base — all fields update instantly. Useful for CS students and engineers.
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Decimal (Base 10)
Binary (Base 2)
Octal (Base 8)
Hexadecimal (Base 16)
Base (2–36)
What does Number Base Converter?
The number base converter lets you convert between all common numeral systems — binary, octal, decimal, hexadecimal — and any base from 2 to 36. All fields update simultaneously.
How to use Number Base Converter?
- Type a number in any field — decimal, binary, octal or hexadecimal.
- All other fields update automatically with every keystroke.
- Use "Custom Base" to convert to any base between 2 and 36.
Key features
- Simultaneous conversion between 4 bases + custom base
- Input validation — only valid characters per base allowed
- Copy button for each field
Frequently asked questions
What is a number base?
A number base defines how many unique digits a numeral system uses. Binary (base 2) uses 0 and 1; hexadecimal (base 16) uses 0–9 and A–F.
What is the number size limit?
The tool uses JavaScript's parseInt and toString, so numbers up to 2^53-1 are supported with full precision.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.