Developer Tools
Number Base Converter — Binary, Octal, Hex, Decimal Free
🔒 Runs in your browser
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.
How to use this tool
- Enter a number and select its current base (binary, octal, decimal, or hex).
- See the instant conversions across all bases.
- Copy the value in the target base.
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.