Unit Converter
Convert units of measurement.
OpenBinary, Octal, Hex conversions. - runs entirely in your browser. Free, fast and private.
Type digits valid in the source base.
Choose binary, octal, decimal, or hexadecimal input.
Value maps to all common bases simultaneously.
Copy hex or binary for low-level programming tasks.
Number Base Converter is a free math & calculators utility on OneDevToolkit. Binary, Octal, Hex conversions. It runs in your browser for this session - use the workspace on this page to try it.
Need a related step? Open the Math & Calculators hub at /math-tools/ or the <a href="/blog/">blog</a> for longer workflows.
Processes data instantly with no server round-trips.
Your data never leaves your browser. Nothing is uploaded.
Works in any modern browser. Nothing to download or install.
No limits, no sign-up, no credit card required.
Works on desktop, tablet and mobile devices.
Beautiful in both themes. Your preference is saved.
Keyboard shortcut
Open Number Base Converter when you need a quick result without uploading data to a third-party site.
No install required - bookmark the tool and return anytime.
Client-side processing keeps inputs on your device for core OneDevToolkit tools.
Answers for this tool. For site-wide help, open the FAQ hub.
Number Base Converter helps you binary, octal, hex conversions. instantly in the browser.
Yes - modern browsers handle Unicode strings. Some case transforms behave differently for locale-specific characters.
Most text tools preserve line structure unless the operation is specifically about wrapping, sorting, or joining lines.
No artificial server quota. Extremely large pastes may slow the tab - split the text if needed.
Use Clear and re-paste, or keep the original in another tab. Browser undo may work inside the textarea.
Processing is local. Avoid pasting secrets into any website if your policy forbids it - prefer offline editors for credentials.
Use Copy on the toolbar or select the output panel. Download is available when the tool exposes a file export.
Treat markup as plain text unless the tool is specifically a Markdown/HTML utility. Preview elsewhere if rendering matters.
Paste from Notes/email, run Number Base Converter, then copy back. Long documents are easier on desktop.
Browse Math & Calculators for case converters, counters, diff, and cleanup tools.