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A practical guide to adding a checkmark or tick mark to a PDF, dropping the symbol where you need it, sizing and aligning it on a checkbox, and saving so it stays put.

A practical guide to adding a background image or pattern behind PDF text, placing the picture, sending it behind the words, and fading it so the content stays readable.

PDFs can carry malware through embedded scripts, malicious links, or risky attachments. Here's what's actually dangerous, what's overblown, and how to stay safe.

Collect signatures from several people on one PDF without ending up with separate copies: sequential or parallel routing, the methods, and what goes wrong.

Check a pdf for hidden metadata and sensitive data before sharing it is one of the most common PDF tasks — and knowing the right method saves hours of frustrat…

Free ways to remove a PDF password you already know, using qpdf, Stirling PDF, Adobe Acrobat or print to PDF, and why none of them breaks encryption.

Cite a PDF with no author, no date or no page numbers in APA and MLA: what to substitute for each missing element, and the one rule both styles share.

Save any web page as a pdf in chrome, safari, firefox, and edge is one of the most common PDF tasks — and knowing the right method saves hours of frustration. …

What an automated PDF accessibility check can and cannot tell you, how to run one, which failures to fix first, and the ten-minute manual check.