Web Tools
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Supports arbitrarily large numbers via BigInt. Runs entirely in your browser — your data never leaves your machine.
number base binary hex octal converter developer-tools
Published May 27, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Enter a number in any supported base and see instant conversions to all four preset bases (binary, octal, decimal, hexadecimal). Select your input base from the dropdown and the tool validates digits in real time. Internally uses BigInt for arbitrarily large number support — no overflow.
Features
- Four bases: Binary (2), Octal (8), Decimal (10), Hexadecimal (16)
- BigInt support: handles numbers of any size without overflow
- Live validation: invalid digits are flagged immediately
- Copy: one-click copy for each result
- Private: runs entirely in the browser — no network requests
Use Cases
- Inspecting memory addresses and bitfields during debugging
- Converting between hex color values and decimal RGB components
- Working with file permissions (octal) in Unix systems
- Analyzing binary protocol data