What does the Number Base Converter do?

Convert numbers between binary, octal, decimal, hex. GeekTool runs the Number Base Converter entirely in your browser — input never leaves your device.

Is the Number Base Converter free?

Yes. The Number Base Converter is part of GeekTool, a free suite of 50+ developer utilities. No sign-up, no ads inside the tool, no quotas.

Does the Number Base Converter send my data to a server?

No. All processing is client-side JavaScript. Your input stays in your browser tab — we never see it.

Number Base Converter

Convert numbers between binary, octal, decimal, hex.

Binary (base 2) Octal (base 8) Decimal (base 10) Hex (base 16)

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About the Number Base Converter

What does the Number Base Converter do?: Convert numbers between binary, octal, decimal, hex. GeekTool runs the Number Base Converter entirely in your browser — input never leaves your device.
Is the Number Base Converter free?: Yes. The Number Base Converter is part of GeekTool, a free suite of 50+ developer utilities. No sign-up, no ads inside the tool, no quotas.
Does the Number Base Converter send my data to a server?: No. All processing is client-side JavaScript. Your input stays in your browser tab — we never see it.