About Ivorytool

Ivorytool is a growing collection of simple tools for the small tasks everyone runs into: working out a percentage, checking an age, planning a loan, and soon resizing a photo for an online form or merging two PDFs.

What we promise

• Free for everyone. Every tool works without an account.
• Private by design. Calculations and file processing happen in your browser. What you type or upload is not sent to our servers.
• Clear answers. Each tool shows its result straight away, explains how it got there, and says plainly what it does not cover.
• Made for the whole world. Tools work in any currency and follow international standards unless a page says it is for a specific country.

How tools are checked

Every formula is covered by automated tests, including awkward cases like leap years, zero values and month-end dates. Each page shows the date its formulas and text were last checked. When a tool depends on official rules, such as photo sizes for a passport, the page links to the official source.

New tools every week

We add a small number of tools each week and only publish a tool when it is finished and tested. If there is a tool you wish existed, tell us.