Guides
Three subjects where almost everything written is wrong or incomplete, and which this service already rests on. No legal advice: technical explanations you can verify yourself.
Redacting a PDF: the black box hides nothing
Drawing a black box over a confidential passage is the most common way to redact a PDF, and it hides nothing at all. Here is why, and what to do instead.
Where your PDFs go when you drop them on a website
Dropping a contract on a free website means sending it to someone else's machine. That is not always true, and you can check the difference yourself in thirty seconds.
Seal, signature, qualified signature: what actually binds you
Three very different things are called "signing a PDF". One is an image, one proves a document has not moved, one binds a named person. Confusing them is expensive.