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.

Vector vs raster: why some images stay sharp and others go blurry

Zoom into one logo and it's crisp; zoom into another and it's a blocky mess. That's vector vs raster. Here's the difference and what it means for your PDFs and images.

Antonia González · Aug 18, 2026 · 5 min read

SECURITY

The PDF that arrived by email, and what it might be carrying

Aug 16, 2026 GUIDES

How to Shrink a PDF to Send on WhatsApp

Aug 16, 2026

Latest

Standards

Fillable PDF forms explained: AcroForm vs XFA

Some PDF forms you can fill anywhere; others demand special software and refuse to open. The difference is AcroForm vs XFA. Here's what that means and how to fill a form in your browser.

Aug 16, 2026 · 5 min read Standards

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 read Standards

How 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 read

No spam. Just PDF craft.

Once in a while, a useful note on PDFs and privacy.

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