THE FILES.CO JOURNAL
Notes on PDFs, privacy, and standards.
How the tools work, why your files never leave the browser, and the technical detail that matters.
A PDF is a container, not a sheet of paper
PDFs can carry whole files inside them, in a name tree the page never shows. How embedded files work, why PDF/A-3 exists, and the bug that loses old attachments.
Aug 15, 2026 · 6 min readStandardsHow content stacks inside a PDF, and why 'behind' isn't a layer
A PDF page has no layers panel. It has a painting order, and whatever is drawn last wins. That single fact explains what overlaying one PDF on another can and can't do.
Aug 14, 2026 · 6 min readGuidesWhy scanned PDFs are so big, and how to shrink them
A five-page scan somehow weighs 40 MB. Here's why scanned PDFs balloon, and how to shrink one to a sane size in your browser without uploading it.
Aug 14, 2026 · 5 min readStandardsA PDF has no page size until someone draws one
Page size in a PDF is just a rectangle written into the file. Change that number and the paper edge moves while the content stays put. Here's what actually resizes a page.
Aug 13, 2026 · 5 min readGuidesWhat counts as an annotation in a PDF (and why some of them look like content)
Sticky notes, highlights, links and form fields all live in the same list inside a PDF. Knowing which is which explains why removing them wholesale breaks documents.
Aug 12, 2026 · 5 min readGuidesA quick checklist before you send a PDF
Before that PDF leaves your hands, thirty seconds of checks saves real embarrassment. Size, fonts, hidden data, security. Here's the list, and how to fix each one in your browser.
Aug 12, 2026 · 5 min readNo spam. Just PDF craft.
Once in a while, a useful note on PDFs and privacy.