Browser utility · No upload
Number Base Converter
Convert integers between binary, octal, decimal, and hexadecimal — free, private, and instant.
Runs locally in your browser — your input is never uploaded or stored.
About this tool
Number Base Converter lets you convert integers between binary, octal, decimal, and hexadecimal without installing an app or creating an account. Arbitrary-size positive and negative integers convert without floating-point precision loss.
Translate between binary, octal, decimal, and hex when reading memory addresses, color values, permission bits, or low-level code.
How it works
- Enter or choose your values
- Review the instant result
- Copy or download the result
Frequently asked questions
How do I use Number Base Converter?
Enter or choose your input in the tool above. The result updates immediately or appears when you select the action, ready to copy or download.
Can it convert very large numbers accurately?
Yes. It uses big-integer math, so even long values convert exactly without the rounding errors floating-point math introduces.
Is Number Base Converter free, and is my data private?
Yes. Number Base Converter is free with no account or watermark, and it runs entirely in your browser so your input is never uploaded, stored, or shared.
Does it work on phones and tablets?
Yes. It works in current browsers on Android, iPhone, iPad, Windows, macOS, and Linux.