Can it handle really big numbers?

Yes. The converter uses BigInt, so it works with integers of any size — well beyond JavaScript's 2^53 safe-integer limit.

Do I need to remove the 0x prefix for hex?

No — the tool auto-detects 0x, 0b and 0o prefixes. You can include them or omit them; either works.

What about fractional numbers?

This tool handles integers only. Fractional base conversion requires arbitrary-precision decimal arithmetic, which is rarely needed for developer use cases.

Are negative numbers supported?

Yes. A leading minus sign is preserved across all conversions.

What if I enter an invalid digit?

You'll see a clear error like 'Invalid digit 9 for base 2'. The tool validates each digit against the source base.

Number Base Converter

Convert between binary, octal, decimal & hex — BigInt-powered.

100% private — no uploads Developer ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Number Base Converter

Follow these steps — everything happens instantly in your browser.

1
Step 1. Type your number in the input field.
2
Step 2. Pick the source base (binary, octal, decimal or hex).
3
Step 3. All four conversions update instantly — copy any of them.

Why use this tool

Frequently asked questions

Everything you might want to know about number base converter.

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