Number Base Converter Online — Free Tool

Seamlessly convert numbers between Binary, Octal, Decimal, and Hexadecimal representations.

Input base

Input value

Supports optional prefixes: 0x, 0b, 0o.

Decimal

255

Binary

0b11111111

Octal

0o377

Hex

0xFF

Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Number Base Converter is a fast, browser-based developer utility. Seamlessly convert numbers between Binary, Octal, Decimal, and Hexadecimal representations. To use it, paste or upload your input in the tool above, choose any options (like formatting style, separators, or output type), and copy or download the result. Because it runs in your browser, it’s ideal for quick edits, previews, and conversions without installing extra software. Common use cases include cleaning up data before sharing, converting formats for a spreadsheet or API, validating content before deployment, and generating outputs you can paste directly into your codebase. If you handle sensitive data, prefer tools that run locally in your browser—this helps reduce the risk of uploading private content to a server.

How to use

Enter or upload your input in the tool panel above.
Adjust any options if provided.
Copy or download the output.

This page is available at /tools/number-base-converter.

Related keywords

base converterbinary to decimalhex to decimaloctal converterbin oct hex converter

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FAQ

What is Number Base Converter?

Number Base Converter is an online tool that helps you seamlessly convert numbers between binary, octal, decimal, and hexadecimal representations.

How do I use the Number Base Converter?

Add your input in the tool panel, adjust options if available, then copy or download the output.

Is this tool free?

Yes—this tool is free to use.

Does it run locally in the browser?

Most tools are designed to run in your browser. If a tool uploads files to a server, it should say so in the UI.