What number bases are supported?

This tool supports all bases from 2 to 36. The most common ones — binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) — have dedicated fields. You can also add a custom base field for any radix between 2 and 36.

Can it handle very large numbers?

Yes! The converter uses JavaScript BigInt under the hood, so it can handle arbitrarily large integers without precision loss.

Is my data sent to any server?

No. All conversions happen entirely in your browser. No data is sent anywhere — your numbers stay on your machine.

What characters are valid for each base?

For bases 2–10, you can use digits 0 through (base-1). For bases 11–36, letters A–Z (case-insensitive) extend the digit set. For example, hexadecimal uses 0–9 and A–F.

Free Developer Tool

Convert Numbers Between
Any Base Instantly

Binary, octal, decimal, hexadecimal, or any custom base from 2 to 36. Type a number and see all conversions in real time — no signup, no API, 100% in-browser.

🔢

All Standard Bases

Binary (2), Octal (8), Decimal (10), and Hexadecimal (16) — the bases every developer needs.

⚡

Real-Time Conversion

See results instantly as you type. No button clicks, no waiting — just fast, live conversion.

🎯

Custom Base Support

Need Base-32 or Base-7? Enter any radix from 2 to 36 and convert freely between them.

Convert

Binary

Base 2

Octal

Base 8

Decimal

Base 10

Hexadecimal

Base 16

Custom Base

Supports integers in any base from 2 to 36. Uses BigInt for arbitrary precision.

Frequently Asked Questions

Everything you need to know about Number Base Converter.