ToolQuarters

Number Base Converter

Convert a number between binary, octal, decimal and hexadecimal. Enter a value in any base and see all four instantly — big numbers are handled exactly with BigInt.

Runs in your browser — your files never leave your device

How to use Number Base Converter

  1. 1Type a value and choose which base it's in.
  2. 2See the binary, octal, decimal and hex equivalents.
  3. 3Copy whichever representation you need.

Frequently asked questions

Does it handle very large numbers?

Yes. Conversion uses BigInt, so there's no precision loss even for huge values.

Can I paste hex with a 0x prefix?

Yes — prefixes like 0x, 0o and 0b are accepted and ignored during parsing.

Is anything sent to a server?

No. All conversion happens in your browser.