Don't take our word for ittest it yourself
Kastavo has no server processing anything. Every tool runs entirely inside your browser — so privacy here isn't a promise, it's something you can verify yourself in under a minute.
Zero upload
No file leaves your device. It's read and processed in your own browser's memory.
Verifiable by you
Turn your internet off and use a tool that shows the badge, or open the Network tab (F12) on a computer and watch every request — none of them carries your content.
No content tracking
What you process never reaches us — so we have no way to see your files or your text.
Try it yourself
Turn your internet off and try
- Open a tool that shows the "Turn your internet off and try" badge and wait for the page to load.
- Turn off Wi-Fi and mobile data (or switch on airplane mode).
- Use the tool with a file or a text of your own: it keeps working, because nothing is sent anywhere.
Or watch the Network tab
Best on a computer- Open any tool and, in your browser's developer tools (F12), go to the Network tab.
- Use the tool with a file or a text of your own.
- Look at the list: you'll see the site loading, the tool's library and, if any, visit analytics, but no request carries your file or your text.
The internet-off test works on the tools that show that badge, once the page has loaded. Some tools (such as extracting text from images, converting PDF to images or generating a PDF from HTML) download a component the first time you use a feature, so they don't carry the badge; your files still never leave your device. See the full list in the FAQ.