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.

How to Add a Photo from Your Phone into an Existing PDF

Need to slot a phone photo into a contract or report that's already a multi-page PDF? Here's how to add it in the right spot without redoing the file.

David Carrero · Sep 29, 2026 · 5 min read

SECURITY

Why Does My PDF Signature Show as Invalid or Not Verified?

Sep 25, 2026 GUIDES

Why Do Fillable Form Fields Disappear When You Print or Save a PDF?

Sep 23, 2026

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Guides

Why Does My PDF Open but Show Blank White Pages?

Your PDF opens fine, but the pages are blank white instead of showing text. Here's why that happens and how to get the content visible again, without uploading anything.

Sep 21, 2026 · 6 min read Guides

Why Is My PDF Blurry After Compressing It?

Compressed a PDF and now the text or images look soft and pixelated? Here's what actually causes the blur, and how to get a smaller file without ruining it.

Sep 17, 2026 · 6 min read Guides

How to Convert PNG or JPG to WebP for a Faster Website

Heavy PNG and JPG images are slowing down your site. Convert them to WebP in your browser, keep the quality, and cut page weight in minutes.

Sep 15, 2026 · 6 min read

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

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