Binary to decimal and base converter
FavoriteBinary to decimal conversion for class work and bitmasks. Switch binary, octal, decimal, and hex with BigInt support. Free in your browser, no upload.
- Binary
11111111 - Octal
377 - Decimal
255 - Hex
ff
Convert between binary, octal, decimal, and hex. Large integers are supported. Nothing is uploaded.
How it works
- 1
Enter your data
Text, a link, or settings — right on this page.
- 2
Instant result
Everything runs on your device. We do not get a copy.
- 3
Copy or save
Use it right away.
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Binary to decimal and other base conversions
Binary to decimal is the classic homework and bitmask check: paste bits, read the decimal value, then copy octal or hex if you need another view.
Use one number base converter for binary, octal, decimal, and hex instead of jumping between single-purpose pages. BigInt handles large integers.
This binary to decimal tool runs locally. Class exercises, flag masks, and debug values never leave your browser.
Good for
- Class exercises
- Bitmask checks
- Hex dumps
- Radix drills
Tips
- Set the input base first
- Use 0b / 0x prefixes when handy
- Copy the base you need
- Watch leading zeros in binary
Common questions
How does binary to decimal conversion work here?
Pick binary as the input base, type the bits, and read the decimal value. You can also copy octal or hex at the same time.
Can I go from decimal to binary as well as binary to decimal?
Yes. Set the input base to decimal and copy the binary output, or start from binary and read decimal.
How large can a binary to decimal number be?
It uses JavaScript BigInt, so very large integers work.
Does binary to decimal accept 0b or 0x prefixes?
Yes for common prefixes. Hex accepts 0x, binary 0b, and octal 0o when you paste that style.
Is this binary to decimal tool free?
Yes. No account and no daily limit. Conversion stays in your browser.