How to check that a "private" PDF tool really doesn't upload your file

<p>A PDF tool can call itself private. You don't have to take its word for it: your browser can show you, in a few minutes, whether the page sends your file anywhere. Here is the check I use, step by step, including what it can and can't prove. Disclosure: I make one of the tools I test with, PDF Guard, and I use it as one example among the tools you can check this way.</p> <h2> Two kinds of "priv

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