How to Convert Number Bases Online
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Free online base converter with step-by-step explanations and support for custom bases (2-36).
Open Number Base Converter →Step-by-Step Guide
Enter your number
Type or paste the number you want to convert. The tool accepts numbers in any base — binary (0s and 1s), octal (0-7), decimal (0-9), or hexadecimal (0-9, A-F). Prefix notation like 0x, 0b, 0o is also supported.
Select the source base
Choose the base of your input number. Common bases include Binary (2), Octal (8), Decimal (10), and Hexadecimal (16). For advanced use, you can select any base from 2 to 36.
See all conversions
The tool instantly displays the number converted to all common bases simultaneously — binary, octal, decimal, and hex. No need to convert one at a time. Each result can be copied with a single click.
Copy the result
Click on any converted value to copy it to your clipboard. The tool preserves proper formatting — including leading zeros for binary, 0x prefix for hex, and grouping separators for readability.
Try It Now — Free
No signup, no download. Runs entirely in your browser.
Open Number Base Converter