About Safe Toolbox
Free online tools that keep your files on your own device. Here's the short story, told through the questions people actually ask.
There are already tons of tool sites. Why build another one?
Fair point. But try merging two PDFs online and most sites will ask you to upload your passport scan or contract to their servers first. Where that file goes and how long it stays there is anyone's guess. With data breaches in the news every other week, that never sat right with us.
So we built tools that don't need your upload. Instead of sending your file to us, we send the processing code to your browser, and the work happens on your device.
- Image, PDF, video and audio tools: your files never reach a server. No upload wait, so they're often faster too.
- Text tools like the JSON formatter, Base64 and QR codes: what you type stays in your browser.
- Calculators: formula-only calculators such as BMI, loan interest and date counters run right in your browser. Only the few that depend on yearly-updated rate tables send just the numbers to our calculation server, which keeps nothing.
Look for the No upload or No server badge on a tool card. The details are in our privacy policy.
It's all free. So how do you pay the bills?
Since your device does the heavy lifting, our servers have very little to do, which keeps running costs low.
Low isn't zero, though: servers, the domain and maintenance still cost something. So we show ads, hoping they'll one day be what keeps this free of sign-ups, paywalls and usage limits. Honestly, ad revenue is currently about $0.02 a day (as of October 2026), so for now the site runs on money saved by skipping a few coffees.
Even better, spread the word with Share or Copy result link under any result. Who knows, maybe one day the site earns a daily cup of coffee on top of its running costs. That would be a powerful motivation to build even better tools. ☕
I wish you had a tool for…
We'd love to hear it. Plenty of the tools here started as someone's "it would be great if…". Drop us a line:
A sentence about when you'd use it helps us build the right thing, e.g. "I need to turn a spreadsheet of customer data into CSV, but I can't upload it anywhere."
A result looks wrong. What now?
First, the fine print: every result on this site is for reference only and has no legal standing. We check the formulas and published rates carefully, but your real numbers can depend on details a calculator can't know. For taxes, pay, contracts or health decisions, confirm with the relevant authority or a professional.
That said, we can get things wrong. Tell us, and we'll look into it and fix what we can.
Let us know which tool, what you entered and what you expected. You can also use Copy result link under the result and paste it in, so we see exactly what you saw (the link contains your inputs, so skip it if you'd rather not share them).
What's here right now?
Image, PDF, video and audio tools, developer utilities, and health, date and loan calculators, with more on the way. See all tools on the home page.