Number Base Converter — Free Online Tool
Type a number in any base (binary, octal, decimal, or hexadecimal) and instantly see the equivalent in all other bases simultaneously. Useful for working with bitwise operations, memory addresses, color values, and network masks.
100% client-side. No uploads. Your data never leaves your browser.
How to use Number Base Converter
- Type a number into any of the four base fields (binary, octal, decimal, or hex).
- All other base fields update immediately with the equivalent value.
- For hex, letters A-F are accepted in uppercase or lowercase.
- Copy any base value using the copy button next to each field.
Frequently Asked Questions
What is the maximum number this handles?
The tool uses JavaScript's Number type, so values up to 2^53 - 1 (about 9 quadrillion) are handled precisely. Larger numbers may lose precision.
Can I input hex values with letters?
Yes. Enter hex values using digits 0-9 and letters A-F (case-insensitive). The 0x prefix is optional.
Why would a developer need base conversion?
Common use cases: reading memory addresses in debuggers (hex), working with file permissions (octal), understanding bitmasks (binary), and inspecting color codes (#RRGGBB in hex).
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