PDF How-To Guides
These guides explain the reasoning behind common PDF tasks, not just the button to click. Each one is written against the actual behavior of the NexKit tool it supports, not general advice - where a guide says a tool will or will not do something, that claim was checked against this site's own code before publication.
Start with the tool if you already know what you need. Come back here when a result surprises you - an unchanged file size, a missing bookmark, a page of pixels that will not search, a document that came back looking nothing like the original - and want to know why, before deciding what to do next.
Compressing PDFs
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How to Compress a PDF Without Visibly Reducing Quality
The result depends more on what is inside your PDF than on which level you pick. Here is why, with realistic numbers.
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Why Some PDF Files Cannot Be Compressed Further
A file that will not shrink is not a broken tool. Here are the four real causes, and what to actually do about each one.
Merging PDFs
Scanned documents and text extraction
Converting PDF and Word
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Why PDF to Word Loses Formatting
The text usually survives. Almost everything about how it was arranged on the page does not. Here is the actual mechanism, not just the warning.
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Chinese PDF to Word Problems and Troubleshooting
Most Chinese PDF to Word problems trace back to one of two causes: no real text layer, or a font encoding the extractor cannot cleanly resolve. Here is how to tell which one you have.
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Why Word to PDF May Look Different From Word or WPS
This tool does not run Word or WPS's layout engine - it renders your document the way a browser would, then photographs the result. The differences follow directly from that.