Developer Tools

Number Base Converter — Binary, Octal, Hex, Decimal Free

Convert numbers between binary, octal, decimal, and hexadecimal. All four values update simultaneously as you type. Runs in your browser — no upload, no account, no tracking.

Frequently Asked Questions

Which bases are supported?
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).
Can I paste 0x or 0b prefixes?
Yes. Leading 0x (hex) and 0b (binary) prefixes are stripped automatically.
What is the maximum number?
Up to 2^53 − 1 (JavaScript's safe integer limit). Larger values are rejected to avoid precision loss.
Is my data sent anywhere?
No. All conversion runs in your browser.