Is this an Adobe Acrobat alternative?

For unlocking your own PDFs, yes — it does it free in the browser. It isn’t a full PDF editor, though.

Do I need to sign up?

Not for your first PDF. A free account unlocks unlimited files and every format.

Adobe Acrobat can unlock PDFs, but it’s paid software — and you don’t need it to get back into your own file.

Here’s how to unlock a PDF you own without Acrobat, right in your browser.