Unix timestamp converter
Convert Unix seconds or milliseconds to a date, or an ISO date to a timestamp.
Developer toolsNumber base converter
Convert whole numbers between binary, octal, decimal and hexadecimal.
Ready when you are.
◎ No uploads. Your input stays here.↗ Free to use. No account needed.⌘ / Ctrl + Enter to run
A worked example
Using the default settings. You can try the same input in the workspace.
Input / settings
255
Expected result
FF
A LITTLE GUIDANCE
How to use Number base converter
Enter an integer without a base prefix, choose the input and output bases, and convert.
Good to know
Uses BigInt for exact whole-number conversion. Fractions are not supported; maximum input length is 10,000 characters.
A few quick answers.
Can I convert very large integers?
Yes. Integer conversion uses BigInt, with up to 10,000 input digits. Fractions and prefixes such as 0x are not accepted; choose the input base explicitly.
Is my input sent to a server?
No. This tool processes your input in your browser. We don't store your text, files or results. Standard website access logs are separate; read our privacy notes.
Can I use it for free?
Yes. No account, subscription or usage credits are required.
How do I keep my result?
Use Copy or Download after running the tool. Inputs are not saved automatically and disappear when you leave or refresh the page.
Something not right? Report a problem with this tool. Include the steps, but never passwords or private input.