What this site is for
Almost every document a course hands you is a PDF, and almost none of it arrives in a shape you can use. A question paper and its mark scheme are two downloads. A combined file puts the answers one scroll from the questions. A phone photograph of your own handwriting is five megabytes a page and the portal wants ten in total.
None of that is difficult to fix. It is just nobody's job to tell you how, so people work around it for years. This site is the tools for those problems and a set of guides explaining the problems themselves - what is actually inside a PDF, why search fails on a scan, why a printed graph gives the wrong gradient, and what redaction has to do to count as redaction.
The reader never uploads anything
It opens your file in your own browser using Mozilla's pdf.js, served from this site rather than from anyone else's. You can disconnect from the network and it still works. The tools that transform a file do have to receive it, and that is stated plainly on every one of their pages.
Guides worth the time
Eight topics, each one a real explainer rather than a list of links, and each with its own spoke articles underneath.
