About CinchPad
A small collection of everyday tools, built to load fast and get out of your way.
What this is
CinchPad is a set of free tools for the small calculations and conversions that come up in ordinary life — working out a tip, checking how many days until an exam, resizing a photo for a form, splitting a bill.
There is no account, no paywall, no upload step, and no "download our app" banner. You open a page, type two numbers, and get an answer.
How the tools work
Every tool on this site runs entirely in your browser using JavaScript. When you type your weight into the BMI calculator or a password into the WiFi QR generator, that text stays on your device. It is not transmitted, not logged, and not stored on any server.
This is not a privacy promise we are asking you to take on trust — it is a consequence of how the site is built. The pages are static files. There is no server-side code to receive your input even if we wanted it.
You can verify this yourself: open your browser's network tab, use any tool, and watch that no request is made. Or disconnect from the internet entirely — most tools keep working.
What we get wrong, and how we handle it
These tools do arithmetic, and arithmetic can be implemented incorrectly. A few things we do to reduce that risk:
- Formulas are stated on the page. Every calculator shows the formula it uses and, where useful, a worked example. If our number disagrees with yours, you can see exactly where.
- Worked examples are checked against the code. The figures quoted in the explanatory text are computed with the same maths the tool runs, not typed from memory.
- Limitations are stated plainly. BMI has well-known blind spots. Percentage changes do not reverse symmetrically. Where a tool can mislead, the page says so rather than hiding it.
If you find an error, please tell us. Corrections are the most useful thing you can send.
What these tools are not
They are estimates and general information. The health tools are not medical advice, the finance tools are not financial advice, and neither is a substitute for a professional who knows your situation. See the disclaimer for the full statement.
How the site is paid for
Advertising. Ads are placed around the content rather than inside it, and no tool is gated behind one. We do not sell data, because we do not collect any.