Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal instantly.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Binary
11111111
Octal
377
Decimal
255
Hexadecimal
ff
Enter a number in any base — binary, octal, decimal or hexadecimal — and instantly see it converted into all the others. Handy for programming, debugging bitwise logic, or homework, without opening a calculator app. Every conversion happens locally in your browser, so nothing you enter is sent to a server.
Frequently Asked Questions
- Which number bases does this tool support?
- Binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16) — enter a value in any one of them and see all four instantly.
- Does it support negative numbers?
- Yes, negative values are converted correctly and shown with a minus sign in every base.
- Is this tool free and private?
- Yes — completely free, no sign-up, and every conversion happens locally in your browser without sending data anywhere.