Base Converter is a free math & calculators tool that runs entirely in your browser — bin / oct / dec / hex live convert. No upload, no account, no limits.
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How to use Base Converter
Open the Base Converter tool.
Paste or type your number into the input field.
The output updates as you type — adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Base Converter
Convert a number between binary, octal, decimal and hexadecimal at once. Edit any field and the other three update live, so you can move freely between bases without doing the arithmetic.
What people use it for
Convert a hex color or byte value to decimal or binary.
Read a binary literal as decimal.
Translate between octal file permissions and other bases.
Frequently asked questions
Which bases are shown?
Binary (2), octal (8), decimal (10) and hexadecimal (16), all editable and kept in sync.
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.