Your data never leaves your device
Do not take our word for it. Practical Tools runs entirely in your browser, so you can prove it in ten seconds: turn off your internet and watch every tool keep working.
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Prove it yourself in 10 seconds
- Open any tool on this site and let the page finish loading.
- Turn off your WiFi, or switch your phone to flight mode.
- Keep using the tool. It still works, instantly, with no connection.
Checking connection...
Turn off your WiFi or flight-mode your phone, then keep using the little calculator below. The status above flips to amber, but the maths still runs. That is only possible because the calculation happens on your device, not on a server.
Tax on this amount
480.00
If your inputs were being sent to a server, the tool would break the moment you went offline. It does not, because the calculation happens on your device.
What stays on your device
Everything you type, upload, or generate stays in your browser and is never sent to us:
- The numbers you enter into calculators.
- The details you put into invoices, quotes, and other documents.
- Images and PDFs you compress, convert, or edit.
- Everything a generator produces before you download it.
We have no database for your tool data, and there is no account to sign into. When you close the tab, the data is gone unless you saved the file yourself.
What actually leaves your browser
We want to be straight with you. Two things involve the network, and both are optional and obvious:
- The contact form. If you choose to email us, your message and email address are sent so we can reply. Nothing else on the site works this way.
- Anonymous analytics. Only if you accept the cookie banner, we count page visits to see which tools are useful. Decline and nothing is set. Full detail is in our Privacy Policy.
Why we can promise this
Practical Tools is built as a set of programs that run inside your browser rather than on our servers. There is no upload step for the tools, because there is nowhere to upload to. On top of that, the site is installable and works offline: your browser keeps a copy of each tool you have opened, so it loads even with no connection. That is the same technology that lets the offline test above succeed.
Use it offline, on any device
Because the tools do not need a server, you can install Practical Tools like an app and use it on a plane, in a basement, or anywhere the signal drops. Install it below, or use your browser's "Install app" / "Add to Home Screen" option to keep it one tap away.