About this tool
This free number base converter converts whole numbers between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). Type a value into any field and the other three update instantly.
Everything runs in your browser — nothing is uploaded.
Features
- Four bases at once — binary, octal, decimal, hex
- Live two-way conversion as you type
- Clear validation for each base
- Great for programming, networking and digital-logic work
How to use it
- Type a number into the field for its base (e.g. Decimal)
- The other bases update automatically
- Edit any field to convert from that base
- Invalid digits for a base are flagged so you can fix them