About ToolBox Pro

ToolBox Pro is a collection of free tools that run entirely in your web browser. Nothing you enter is uploaded, and there is no account to create.

Why browser-based

Most free online tools work by uploading your file to a server, processing it there and sending the result back. That means handing a stranger your document, your spreadsheet or your photograph, and trusting a promise about what happens next.

Everything here is JavaScript running on your own machine. Your PDF is merged on your device. Your password is hashed on your device. The site could not read your input if it wanted to, because the input never travels. That is a structural property, not a policy.

Two tools are exceptions and cannot be, because they exist to ask an external service a question. Both say so on their own page, and both are listed in the Privacy Policy.

How it is built

Static HTML, CSS and JavaScript, with no tracking and no advertising. The site enforces a strict Content Security Policy that forbids inline script, so an injected script cannot execute. Every third-party library is pinned with a Subresource Integrity hash, so a compromised CDN cannot swap it for something else.

On accuracy

Tools that calculate anything about money, tax or health state the formula or standard they implement, the assumptions they make, and what they deliberately do not do. Where a figure cannot be derived responsibly from the inputs, the tool says so instead of inventing a number. Where a figure depends on a rule that changes, such as a tax year or a statutory threshold, the tool names the year it implements so you can tell whether it is current.