Useful tools, honest numbers

FreeToolShelf is a collection of free online tools for everyday problems: working out a mortgage repayment, compressing a PDF, formatting JSON, planning a campaign or pricing a job. We built it for students, freelancers, creators, marketers, small businesses and homebuyers who want a quick, reliable answer without creating an account.

Real logic, shown openlyEvery calculator uses tested formulas and explains its method and assumptions on the page.
Private by defaultCalculators, PDF, image and developer tools run in your browser. Your files are not uploaded.
No invented numbersWe do not fill in interest rates, taxes, prices or scores we cannot verify. You enter your own figures.
Free, with clear disclosureTools are free to use. Where we earn from affiliate links or ads, we say so.

How we build and check tools

Financial calculators are written as small, separately tested modules. We check them against published reference values and independent closed-form calculations, and we document assumptions such as compounding, rounding and how extra payments are applied. Australian stamp duty rules come from state and territory revenue office sources, with the retrieval date shown next to each result.

How the site is funded

The site may show clearly labelled advertising and includes some affiliate links, such as for the GoHighLevel CRM discussed in our CRM resources. We also offer an optional CRM implementation service. None of this is required to use the tools. Read our affiliate disclosure.

Get in touch

Spotted a mistake or want a new tool? Contact us.